TY  - JOUR
AU  - Mojović, Zorica
AU  - Petrović, Srđan
AU  - Mojović, Miloš
AU  - Pavlović, Stefan
AU  - Rožić, Ljiljana
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3702
AB  - In this paper, the relationship of structure, type of oxygen defects, valence states of Cr and Ru, and electro-
chemical properties of La0.7Sr0.3Cr1-XRuXO3 (0 < x < 0.1) perovskite-type oxides were studied. The samples were 
synthesized by a conventional solid-state reaction method and characterized by powder X-ray diffraction, X-ray 
fluorescence spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and electron 
paramagnetic resonance spectroscopy. The electrochemical performance of these samples was evaluated towards 
the detection of 4-nitrophenol and strongly depends on the concentration of ruthenium incorporated in the 
crystal lattice. A new La0.7Sr0.3Cr0.925Ru0.075O3 electrocatalyst with a wide linear concentration range (25–5000 
mM) and a detection limit of 8 mM was obtained. These results provide an opportunity for its application in the 
analysis of real water samples.
PB  - Elsevier
T2  - Journal of Physics and Chemistry of Solids
T1  - Ruthenium containing perovskites as electrode materials for  4-nitrophenol detection
VL  - 148
SP  - 109649
DO  - 10.1016/j.jpcs.2020.109649
ER  - 

@article{
author = "Mojović, Zorica and Petrović, Srđan and Mojović, Miloš and Pavlović, Stefan and Rožić, Ljiljana",
year = "2021",
abstract = "In this paper, the relationship of structure, type of oxygen defects, valence states of Cr and Ru, and electro-
chemical properties of La0.7Sr0.3Cr1-XRuXO3 (0 < x < 0.1) perovskite-type oxides were studied. The samples were 
synthesized by a conventional solid-state reaction method and characterized by powder X-ray diffraction, X-ray 
fluorescence spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and electron 
paramagnetic resonance spectroscopy. The electrochemical performance of these samples was evaluated towards 
the detection of 4-nitrophenol and strongly depends on the concentration of ruthenium incorporated in the 
crystal lattice. A new La0.7Sr0.3Cr0.925Ru0.075O3 electrocatalyst with a wide linear concentration range (25–5000 
mM) and a detection limit of 8 mM was obtained. These results provide an opportunity for its application in the 
analysis of real water samples.",
publisher = "Elsevier",
journal = "Journal of Physics and Chemistry of Solids",
title = "Ruthenium containing perovskites as electrode materials for  4-nitrophenol detection",
volume = "148",
pages = "109649",
doi = "10.1016/j.jpcs.2020.109649"
}

Mojović, Z., Petrović, S., Mojović, M., Pavlović, S.,& Rožić, L.. (2021). Ruthenium containing perovskites as electrode materials for  4-nitrophenol detection. in Journal of Physics and Chemistry of Solids
Elsevier., 148, 109649.
https://doi.org/10.1016/j.jpcs.2020.109649

Mojović Z, Petrović S, Mojović M, Pavlović S, Rožić L. Ruthenium containing perovskites as electrode materials for  4-nitrophenol detection. in Journal of Physics and Chemistry of Solids. 2021;148:109649.
doi:10.1016/j.jpcs.2020.109649 .

Mojović, Zorica, Petrović, Srđan, Mojović, Miloš, Pavlović, Stefan, Rožić, Ljiljana, "Ruthenium containing perovskites as electrode materials for  4-nitrophenol detection" in Journal of Physics and Chemistry of Solids, 148 (2021):109649,
https://doi.org/10.1016/j.jpcs.2020.109649 . .

TY  - JOUR
AU  - Petrović, Srđan
AU  - Stanković, Miroslav
AU  - Pavlović, Stefan
AU  - Mojović, Zorica
AU  - Radić, Nenad
AU  - Mojović, Miloš
AU  - Rožić, Ljiljana
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4722
AB  - This paper presents a new two-step method for the synthesis of NiO/TiO2–CeO2 semiconductors, which implies, the first, the mechanochemical synthesis of TiO2–CeO2 support, and the second is the doping of different NiO contents by chemical precipitation in an aqueous medium in an ambient atmosphere. Structural, optical, electrochemical and photocatalytic properties of NiO/TiO2–CeO2 semiconductors were examined. The influence of different NiO contents on the electrocatalytic activity of NiO/TiO2–CeO2 samples was investigated in the oxygen evolution reaction and the results showed that the samples with the lowest NiO content have the highest electroactivity. The photocatalytic activity was determined during the phenol decomposition process over the samples with different NiO:TiO2–CeO2 ratios and the best photocatalytic activity is observed for the sample with 4.1 mol% NiO. The sample with the lowest NiO content obtained by a relatively simple method is suitable for use both as an electrode material in the oxygen evolution reaction and as a photocatalyst in the phenol decomposition process.
PB  - Springer
T2  - Reaction Kinetics, Mechanisms and Catalysis
T1  - Nickel oxide on mechanochemically synthesized TiO2–CeO2: photocatalytic and electrochemical activity
VL  - 133
SP  - 1097
EP  - 1110
DO  - 10.1007/s11144-021-02014-8
ER  - 

@article{
author = "Petrović, Srđan and Stanković, Miroslav and Pavlović, Stefan and Mojović, Zorica and Radić, Nenad and Mojović, Miloš and Rožić, Ljiljana",
year = "2021",
abstract = "This paper presents a new two-step method for the synthesis of NiO/TiO2–CeO2 semiconductors, which implies, the first, the mechanochemical synthesis of TiO2–CeO2 support, and the second is the doping of different NiO contents by chemical precipitation in an aqueous medium in an ambient atmosphere. Structural, optical, electrochemical and photocatalytic properties of NiO/TiO2–CeO2 semiconductors were examined. The influence of different NiO contents on the electrocatalytic activity of NiO/TiO2–CeO2 samples was investigated in the oxygen evolution reaction and the results showed that the samples with the lowest NiO content have the highest electroactivity. The photocatalytic activity was determined during the phenol decomposition process over the samples with different NiO:TiO2–CeO2 ratios and the best photocatalytic activity is observed for the sample with 4.1 mol% NiO. The sample with the lowest NiO content obtained by a relatively simple method is suitable for use both as an electrode material in the oxygen evolution reaction and as a photocatalyst in the phenol decomposition process.",
publisher = "Springer",
journal = "Reaction Kinetics, Mechanisms and Catalysis",
title = "Nickel oxide on mechanochemically synthesized TiO2–CeO2: photocatalytic and electrochemical activity",
volume = "133",
pages = "1097-1110",
doi = "10.1007/s11144-021-02014-8"
}

Petrović, S., Stanković, M., Pavlović, S., Mojović, Z., Radić, N., Mojović, M.,& Rožić, L.. (2021). Nickel oxide on mechanochemically synthesized TiO2–CeO2: photocatalytic and electrochemical activity. in Reaction Kinetics, Mechanisms and Catalysis
Springer., 133, 1097-1110.
https://doi.org/10.1007/s11144-021-02014-8

Petrović S, Stanković M, Pavlović S, Mojović Z, Radić N, Mojović M, Rožić L. Nickel oxide on mechanochemically synthesized TiO2–CeO2: photocatalytic and electrochemical activity. in Reaction Kinetics, Mechanisms and Catalysis. 2021;133:1097-1110.
doi:10.1007/s11144-021-02014-8 .

Petrović, Srđan, Stanković, Miroslav, Pavlović, Stefan, Mojović, Zorica, Radić, Nenad, Mojović, Miloš, Rožić, Ljiljana, "Nickel oxide on mechanochemically synthesized TiO2–CeO2: photocatalytic and electrochemical activity" in Reaction Kinetics, Mechanisms and Catalysis, 133 (2021):1097-1110,
https://doi.org/10.1007/s11144-021-02014-8 . .

TY  - JOUR
AU  - Petrović, Srđan
AU  - Rožić, Ljiljana
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Cherkezova-Zheleva, Zara
AU  - Stojadinović, Stevan
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5688
AB  - The LaTi0.4Mg0.4Fe0.2O3 perovskite was synthesized using a mechanochemical process followed by high-temperature annealing at 600 and 800 ​°C. The effects of milling time and annealing temperature on structural, microstructural changes and optical properties were examined. The photocatalytic activity of LaTi0.4Mg0.4Fe0.2O3 perovskite was evaluated through the photodegradation of methyl orange and methylene blue dyes under UV light irradiation. The results showed that the annealing temperature performed an important role in the crystallite size, crystalline degree, photoluminescence, and band gaps of the LaTi0.4Mg0.4Fe0.2O3 samples. The temperature of annealing had a profound influence on the photocatalytic activities of the LaTi0.4Mg0.4Fe0.2O3 perovskite in the single and binary dye system. The highest photocatalytic activity for methyl orange degradation showed the LaTi0.4Mg0.4Fe0.2O3 annealed at 800 ​°C, while not annealed sample, show the highest activity for degradation of methylene blue. The maximum efficiency of methylene blue photodegradation in individual and binary mixtures was observed over non-annealed perovskite at the same irradiation times. The photodegradation of methylene blue and methyl orange on the LaTi0.4Mg0.4Fe0.2O3 followed a pseudo-first-order kinetic process.
PB  - Elsevier
T2  - Journal of Solid State Chemistry
T1  - Structural, optical and photocatalytic properties of LaTi0.4Mg0.4Fe0.2O3 perovskite prepared by high-energy ball milling
VL  - 297
SP  - 122085
DO  - 10.1016/j.jssc.2021.122085
ER  - 

@article{
author = "Petrović, Srđan and Rožić, Ljiljana and Grbić, Boško and Radić, Nenad and Cherkezova-Zheleva, Zara and Stojadinović, Stevan",
year = "2021",
abstract = "The LaTi0.4Mg0.4Fe0.2O3 perovskite was synthesized using a mechanochemical process followed by high-temperature annealing at 600 and 800 ​°C. The effects of milling time and annealing temperature on structural, microstructural changes and optical properties were examined. The photocatalytic activity of LaTi0.4Mg0.4Fe0.2O3 perovskite was evaluated through the photodegradation of methyl orange and methylene blue dyes under UV light irradiation. The results showed that the annealing temperature performed an important role in the crystallite size, crystalline degree, photoluminescence, and band gaps of the LaTi0.4Mg0.4Fe0.2O3 samples. The temperature of annealing had a profound influence on the photocatalytic activities of the LaTi0.4Mg0.4Fe0.2O3 perovskite in the single and binary dye system. The highest photocatalytic activity for methyl orange degradation showed the LaTi0.4Mg0.4Fe0.2O3 annealed at 800 ​°C, while not annealed sample, show the highest activity for degradation of methylene blue. The maximum efficiency of methylene blue photodegradation in individual and binary mixtures was observed over non-annealed perovskite at the same irradiation times. The photodegradation of methylene blue and methyl orange on the LaTi0.4Mg0.4Fe0.2O3 followed a pseudo-first-order kinetic process.",
publisher = "Elsevier",
journal = "Journal of Solid State Chemistry",
title = "Structural, optical and photocatalytic properties of LaTi0.4Mg0.4Fe0.2O3 perovskite prepared by high-energy ball milling",
volume = "297",
pages = "122085",
doi = "10.1016/j.jssc.2021.122085"
}

Petrović, S., Rožić, L., Grbić, B., Radić, N., Cherkezova-Zheleva, Z.,& Stojadinović, S.. (2021). Structural, optical and photocatalytic properties of LaTi0.4Mg0.4Fe0.2O3 perovskite prepared by high-energy ball milling. in Journal of Solid State Chemistry
Elsevier., 297, 122085.
https://doi.org/10.1016/j.jssc.2021.122085

Petrović S, Rožić L, Grbić B, Radić N, Cherkezova-Zheleva Z, Stojadinović S. Structural, optical and photocatalytic properties of LaTi0.4Mg0.4Fe0.2O3 perovskite prepared by high-energy ball milling. in Journal of Solid State Chemistry. 2021;297:122085.
doi:10.1016/j.jssc.2021.122085 .

Petrović, Srđan, Rožić, Ljiljana, Grbić, Boško, Radić, Nenad, Cherkezova-Zheleva, Zara, Stojadinović, Stevan, "Structural, optical and photocatalytic properties of LaTi0.4Mg0.4Fe0.2O3 perovskite prepared by high-energy ball milling" in Journal of Solid State Chemistry, 297 (2021):122085,
https://doi.org/10.1016/j.jssc.2021.122085 . .

TY  - JOUR
AU  - Mojović, Zorica
AU  - Petrović, Srđan
AU  - Rožić, Ljiljana
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4086
AB  - U ovom radu su okarakterisani novi elektrodni materijali na bazi perovskita za detekciju 4-nitrofenola.
Mešoviti oksidi perovskitnog tipa hemijske formule La0.7Sr0.3Cr1-XRuXO3 (X= 0; 0.05) su sintetisani
konvencionalnim keramičkim postupkom. Rezultati rendgenske difrakcione analize su pokazali da je
sintetizovani sistem dvofazan, i da pored dominantne perovskitne faze sadrži udeo stroncijum hromata.
Ugljenična pasta elektroda je modifikovana sintetisanim perovskitima kako bi se ispitala njihova
elektroaktivnost. Tako dobijene elektrode su primenjene za oksido-redukciju 4-nitrofenola u kiseloj
sredini. Prisustvo rutenijuma u perovskitnoj strukturi dovodi do povećane elektrohemijske aktivnosti
elektrode za redukciju 4-nitrofenola.
AB  - In this paper new perovskite-based electrode materialsfor 4-nitrophenol detection were characterized. Mixed oxides of pereovskite type with general molecular formula La0.7Sr0.3Cr1-XRuX03 (X= 0; 0.05) were synthesized by ceramic procedure. The results of X-ray diffraction analysis showed that synthesized system has two-phase structure, including strontium chromate phase beside dominant perovskite phase. Carbon paste electrode was modified with synthsized perovskites in order to study their electrochemical activity. Electrode prepared innn such manner were used for oxido-reduction of 4-nitrophenol in acidic media. The addition of ruthenium to perovskite structure lead to increased electrochemical activity of this electrode for reduction of 4-nitrophenol.
PB  - Beograd : Savez inženjera i tehničara Srbije
T2  - Tehnika
T1  - Uloga rutenijuma u mešovitom oksidu perovskitnog tipa u elektrohemijskoj degradaciji 4-nitrofenola
T1  - The role of ruthenium in perovskite-type mixed oxide in the electrochemical degradation of 4-nitrophenol
VL  - 29
IS  - 6
SP  - 695
EP  - 699
DO  - 10.5937/tehnika2006695M
ER  - 

@article{
author = "Mojović, Zorica and Petrović, Srđan and Rožić, Ljiljana",
year = "2020",
abstract = "U ovom radu su okarakterisani novi elektrodni materijali na bazi perovskita za detekciju 4-nitrofenola.
Mešoviti oksidi perovskitnog tipa hemijske formule La0.7Sr0.3Cr1-XRuXO3 (X= 0; 0.05) su sintetisani
konvencionalnim keramičkim postupkom. Rezultati rendgenske difrakcione analize su pokazali da je
sintetizovani sistem dvofazan, i da pored dominantne perovskitne faze sadrži udeo stroncijum hromata.
Ugljenična pasta elektroda je modifikovana sintetisanim perovskitima kako bi se ispitala njihova
elektroaktivnost. Tako dobijene elektrode su primenjene za oksido-redukciju 4-nitrofenola u kiseloj
sredini. Prisustvo rutenijuma u perovskitnoj strukturi dovodi do povećane elektrohemijske aktivnosti
elektrode za redukciju 4-nitrofenola., In this paper new perovskite-based electrode materialsfor 4-nitrophenol detection were characterized. Mixed oxides of pereovskite type with general molecular formula La0.7Sr0.3Cr1-XRuX03 (X= 0; 0.05) were synthesized by ceramic procedure. The results of X-ray diffraction analysis showed that synthesized system has two-phase structure, including strontium chromate phase beside dominant perovskite phase. Carbon paste electrode was modified with synthsized perovskites in order to study their electrochemical activity. Electrode prepared innn such manner were used for oxido-reduction of 4-nitrophenol in acidic media. The addition of ruthenium to perovskite structure lead to increased electrochemical activity of this electrode for reduction of 4-nitrophenol.",
publisher = "Beograd : Savez inženjera i tehničara Srbije",
journal = "Tehnika",
title = "Uloga rutenijuma u mešovitom oksidu perovskitnog tipa u elektrohemijskoj degradaciji 4-nitrofenola, The role of ruthenium in perovskite-type mixed oxide in the electrochemical degradation of 4-nitrophenol",
volume = "29",
number = "6",
pages = "695-699",
doi = "10.5937/tehnika2006695M"
}

Mojović, Z., Petrović, S.,& Rožić, L.. (2020). Uloga rutenijuma u mešovitom oksidu perovskitnog tipa u elektrohemijskoj degradaciji 4-nitrofenola. in Tehnika
Beograd : Savez inženjera i tehničara Srbije., 29(6), 695-699.
https://doi.org/10.5937/tehnika2006695M

Mojović Z, Petrović S, Rožić L. Uloga rutenijuma u mešovitom oksidu perovskitnog tipa u elektrohemijskoj degradaciji 4-nitrofenola. in Tehnika. 2020;29(6):695-699.
doi:10.5937/tehnika2006695M .

Mojović, Zorica, Petrović, Srđan, Rožić, Ljiljana, "Uloga rutenijuma u mešovitom oksidu perovskitnog tipa u elektrohemijskoj degradaciji 4-nitrofenola" in Tehnika, 29, no. 6 (2020):695-699,
https://doi.org/10.5937/tehnika2006695M . .

TY  - JOUR
AU  - Rožić, Ljiljana
AU  - Petrović, Srđan
AU  - Lončarević, Davor
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Stojadinović, Stevan
AU  - Jović, Vesna
AU  - Lamovec, Jelena
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2486
AB  - TiO2-CeO2 nanopowders were synthesised by a ball-milling process and then annealed at temperatures from 500 degrees to 800 degrees C. X-ray diffraction and diffuse reflectance spectra were used in combination with temperature programmed desorption to determine the structural and microstructural changes of nanopowders as a the function of annealing temperature. The results of the X-ray analysis showed that the weight fraction of the cerianite phase remained unchanged with a temperature rise of 600-700 degrees C, indicating that the phase changes occur only within TiO2. The TiO2-CeO2 nanopowder showed enhanced optical properties with a red shift after the thermal treatment. Photocatalytic studies revealed that the sample annealed at 600 degrees C showed higher photocatalytic activity than samples annealed at lower or higher temperatures in the degradation of the methyl orange. The activity test of all samples is in accordance with photoluminescence measurements, proportional to the concentrations of hydroxyl radicals at the photocatalyst surfaces.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders
VL  - 45
IS  - 2
SP  - 2361
EP  - 2367
DO  - 10.1016/j.ceramint.2018.10.153
ER  - 

@article{
author = "Rožić, Ljiljana and Petrović, Srđan and Lončarević, Davor and Grbić, Boško and Radić, Nenad and Stojadinović, Stevan and Jović, Vesna and Lamovec, Jelena",
year = "2019",
abstract = "TiO2-CeO2 nanopowders were synthesised by a ball-milling process and then annealed at temperatures from 500 degrees to 800 degrees C. X-ray diffraction and diffuse reflectance spectra were used in combination with temperature programmed desorption to determine the structural and microstructural changes of nanopowders as a the function of annealing temperature. The results of the X-ray analysis showed that the weight fraction of the cerianite phase remained unchanged with a temperature rise of 600-700 degrees C, indicating that the phase changes occur only within TiO2. The TiO2-CeO2 nanopowder showed enhanced optical properties with a red shift after the thermal treatment. Photocatalytic studies revealed that the sample annealed at 600 degrees C showed higher photocatalytic activity than samples annealed at lower or higher temperatures in the degradation of the methyl orange. The activity test of all samples is in accordance with photoluminescence measurements, proportional to the concentrations of hydroxyl radicals at the photocatalyst surfaces.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders",
volume = "45",
number = "2",
pages = "2361-2367",
doi = "10.1016/j.ceramint.2018.10.153"
}

Rožić, L., Petrović, S., Lončarević, D., Grbić, B., Radić, N., Stojadinović, S., Jović, V.,& Lamovec, J.. (2019). Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders. in Ceramics International
Elsevier Sci Ltd, Oxford., 45(2), 2361-2367.
https://doi.org/10.1016/j.ceramint.2018.10.153

Rožić L, Petrović S, Lončarević D, Grbić B, Radić N, Stojadinović S, Jović V, Lamovec J. Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders. in Ceramics International. 2019;45(2):2361-2367.
doi:10.1016/j.ceramint.2018.10.153 .

Rožić, Ljiljana, Petrović, Srđan, Lončarević, Davor, Grbić, Boško, Radić, Nenad, Stojadinović, Stevan, Jović, Vesna, Lamovec, Jelena, "Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders" in Ceramics International, 45, no. 2 (2019):2361-2367,
https://doi.org/10.1016/j.ceramint.2018.10.153 . .

TY  - JOUR
AU  - Rožić, Ljiljana
AU  - Petrović, Srđan
AU  - Lončarević, Davor
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Stojadinović, Stevan
AU  - Jović, Vesna
AU  - Lamovec, Jelena
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2900
AB  - TiO2-CeO2 nanopowders were synthesised by a ball-milling process and then annealed at temperatures from 500 degrees to 800 degrees C. X-ray diffraction and diffuse reflectance spectra were used in combination with temperature programmed desorption to determine the structural and microstructural changes of nanopowders as a the function of annealing temperature. The results of the X-ray analysis showed that the weight fraction of the cerianite phase remained unchanged with a temperature rise of 600-700 degrees C, indicating that the phase changes occur only within TiO2. The TiO2-CeO2 nanopowder showed enhanced optical properties with a red shift after the thermal treatment. Photocatalytic studies revealed that the sample annealed at 600 degrees C showed higher photocatalytic activity than samples annealed at lower or higher temperatures in the degradation of the methyl orange. The activity test of all samples is in accordance with photoluminescence measurements, proportional to the concentrations of hydroxyl radicals at the photocatalyst surfaces.
PB  - Oxford : Elsevier Sci Ltd.
T2  - Ceramics International
T1  - Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders
VL  - 45
IS  - 2
SP  - 2361
EP  - 2367
DO  - 10.1016/j.ceramint.2018.10.153
ER  - 

@article{
author = "Rožić, Ljiljana and Petrović, Srđan and Lončarević, Davor and Grbić, Boško and Radić, Nenad and Stojadinović, Stevan and Jović, Vesna and Lamovec, Jelena",
year = "2019",
abstract = "TiO2-CeO2 nanopowders were synthesised by a ball-milling process and then annealed at temperatures from 500 degrees to 800 degrees C. X-ray diffraction and diffuse reflectance spectra were used in combination with temperature programmed desorption to determine the structural and microstructural changes of nanopowders as a the function of annealing temperature. The results of the X-ray analysis showed that the weight fraction of the cerianite phase remained unchanged with a temperature rise of 600-700 degrees C, indicating that the phase changes occur only within TiO2. The TiO2-CeO2 nanopowder showed enhanced optical properties with a red shift after the thermal treatment. Photocatalytic studies revealed that the sample annealed at 600 degrees C showed higher photocatalytic activity than samples annealed at lower or higher temperatures in the degradation of the methyl orange. The activity test of all samples is in accordance with photoluminescence measurements, proportional to the concentrations of hydroxyl radicals at the photocatalyst surfaces.",
publisher = "Oxford : Elsevier Sci Ltd.",
journal = "Ceramics International",
title = "Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders",
volume = "45",
number = "2",
pages = "2361-2367",
doi = "10.1016/j.ceramint.2018.10.153"
}

Rožić, L., Petrović, S., Lončarević, D., Grbić, B., Radić, N., Stojadinović, S., Jović, V.,& Lamovec, J.. (2019). Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders. in Ceramics International
Oxford : Elsevier Sci Ltd.., 45(2), 2361-2367.
https://doi.org/10.1016/j.ceramint.2018.10.153

Rožić L, Petrović S, Lončarević D, Grbić B, Radić N, Stojadinović S, Jović V, Lamovec J. Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders. in Ceramics International. 2019;45(2):2361-2367.
doi:10.1016/j.ceramint.2018.10.153 .

Rožić, Ljiljana, Petrović, Srđan, Lončarević, Davor, Grbić, Boško, Radić, Nenad, Stojadinović, Stevan, Jović, Vesna, Lamovec, Jelena, "Influence of annealing temperature on structural, optical and photocatalytic properties of TiO2-CeO2 nanopowders" in Ceramics International, 45, no. 2 (2019):2361-2367,
https://doi.org/10.1016/j.ceramint.2018.10.153 . .

TY  - JOUR
AU  - Petrović, Srđan
AU  - Rožić, Ljiljana
AU  - Stojadinović, Stevan
AU  - Grbić, Boško
AU  - Vasilić, Rastko
AU  - Vuković, Zorica
AU  - Radić, Nenad
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2349
AB  - In this study, WO3 doped TiO2 powders were synthesized via sol-gel method combined with a hydrothermal process. The effect of sintering temperature on mesoporous structure and catalytic activities of these powders were investigated. The physical analysis via X-ray diffraction indicates that prepared samples are a mixture of anatase and rutile TiO2 phases. X-ray peak analysis is used to evaluate the crystallite size and lattice strain by the Williamson-Hall analysis. Considering all the reflections of the anatase phase the lattice strain ranging from c = 9.505 to c = 9.548 is calculated, suggesting that microstrain decreases when calcination temperature increases. N-2 adsorption-desorption analysis shows that the surface area and pore volume decrease with increasing temperature and that WOx-TiO2 powders primarily consist of mesopores. Sintering temperature induced a change in textural properties causing a systematic shift towards larger mesopores. Simultaneously, photoactivity in decolorization of methyl orange increases with increasing calcination temperature up to 700 degrees C, followed by significant decrease with its further increase.
PB  - International Institute for the Science of Sintering, Beograd
T2  - Science of Sintering
T1  - The Effect of Sintering Temperature on Mesoporous Structure of WO3 Doped Tio(2) Powders
VL  - 50
IS  - 1
SP  - 123
EP  - 132
DO  - 10.2298/SOS1801123P
ER  - 

@article{
author = "Petrović, Srđan and Rožić, Ljiljana and Stojadinović, Stevan and Grbić, Boško and Vasilić, Rastko and Vuković, Zorica and Radić, Nenad",
year = "2018",
abstract = "In this study, WO3 doped TiO2 powders were synthesized via sol-gel method combined with a hydrothermal process. The effect of sintering temperature on mesoporous structure and catalytic activities of these powders were investigated. The physical analysis via X-ray diffraction indicates that prepared samples are a mixture of anatase and rutile TiO2 phases. X-ray peak analysis is used to evaluate the crystallite size and lattice strain by the Williamson-Hall analysis. Considering all the reflections of the anatase phase the lattice strain ranging from c = 9.505 to c = 9.548 is calculated, suggesting that microstrain decreases when calcination temperature increases. N-2 adsorption-desorption analysis shows that the surface area and pore volume decrease with increasing temperature and that WOx-TiO2 powders primarily consist of mesopores. Sintering temperature induced a change in textural properties causing a systematic shift towards larger mesopores. Simultaneously, photoactivity in decolorization of methyl orange increases with increasing calcination temperature up to 700 degrees C, followed by significant decrease with its further increase.",
publisher = "International Institute for the Science of Sintering, Beograd",
journal = "Science of Sintering",
title = "The Effect of Sintering Temperature on Mesoporous Structure of WO3 Doped Tio(2) Powders",
volume = "50",
number = "1",
pages = "123-132",
doi = "10.2298/SOS1801123P"
}

Petrović, S., Rožić, L., Stojadinović, S., Grbić, B., Vasilić, R., Vuković, Z.,& Radić, N.. (2018). The Effect of Sintering Temperature on Mesoporous Structure of WO3 Doped Tio(2) Powders. in Science of Sintering
International Institute for the Science of Sintering, Beograd., 50(1), 123-132.
https://doi.org/10.2298/SOS1801123P

Petrović S, Rožić L, Stojadinović S, Grbić B, Vasilić R, Vuković Z, Radić N. The Effect of Sintering Temperature on Mesoporous Structure of WO3 Doped Tio(2) Powders. in Science of Sintering. 2018;50(1):123-132.
doi:10.2298/SOS1801123P .

Petrović, Srđan, Rožić, Ljiljana, Stojadinović, Stevan, Grbić, Boško, Vasilić, Rastko, Vuković, Zorica, Radić, Nenad, "The Effect of Sintering Temperature on Mesoporous Structure of WO3 Doped Tio(2) Powders" in Science of Sintering, 50, no. 1 (2018):123-132,
https://doi.org/10.2298/SOS1801123P . .

TY  - JOUR
AU  - Petrović, Srđan
AU  - Rožić, Ljiljana
AU  - Jović, Vesna
AU  - Stojadinović, Stevan
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Lamovec, Jelena
AU  - Vasilić, Rastko
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2454
AB  - Nanocrystalline TiO2-CeO2 powders were synthesized from their TiO2 and CeO2 oxides using mechanical ball milling process. The response surface method is applied to identify optimal parameters for the synthesis of TiO2-CeO2 photocatalyst. Analysis of variance and main effect plot are used to determine the significant parameters and set the optimal level for each parameter. Regression analysis showed good agreement of experimental data with the second-order polynomial model with a coefficients of determination: R-2 = 0.991, R-Adj(2). = 0.940 and R-Pred(2). = 0.983. Under optimal experimental conditions of TiO2:CeO2 weight percentage ratio 71: 29, milling speed 200 rpm, and milling time 115 min the highest photodegradation efficiency was achieved. On the basis of the above statistical analysis, it was found that the band gap energy of TiO2-CeO2 nanoparticles decreases with the increase of the milling speed and milling time with constant TiO2:CeO2 weight percentage ratio. Obtained results suggest that mechanical ball milling process is a rapid, efficient and low energy consumption method to synthesize TiO2-CeO2 photocatalyst.
PB  - Elsevier
T2  - Advanced Powder Technology
T1  - Optimization of a nanoparticle ball milling process parameters using the response surface method
VL  - 29
IS  - 9
SP  - 2129
EP  - 2139
DO  - 10.1016/j.apt.2018.05.021
ER  - 

@article{
author = "Petrović, Srđan and Rožić, Ljiljana and Jović, Vesna and Stojadinović, Stevan and Grbić, Boško and Radić, Nenad and Lamovec, Jelena and Vasilić, Rastko",
year = "2018",
abstract = "Nanocrystalline TiO2-CeO2 powders were synthesized from their TiO2 and CeO2 oxides using mechanical ball milling process. The response surface method is applied to identify optimal parameters for the synthesis of TiO2-CeO2 photocatalyst. Analysis of variance and main effect plot are used to determine the significant parameters and set the optimal level for each parameter. Regression analysis showed good agreement of experimental data with the second-order polynomial model with a coefficients of determination: R-2 = 0.991, R-Adj(2). = 0.940 and R-Pred(2). = 0.983. Under optimal experimental conditions of TiO2:CeO2 weight percentage ratio 71: 29, milling speed 200 rpm, and milling time 115 min the highest photodegradation efficiency was achieved. On the basis of the above statistical analysis, it was found that the band gap energy of TiO2-CeO2 nanoparticles decreases with the increase of the milling speed and milling time with constant TiO2:CeO2 weight percentage ratio. Obtained results suggest that mechanical ball milling process is a rapid, efficient and low energy consumption method to synthesize TiO2-CeO2 photocatalyst.",
publisher = "Elsevier",
journal = "Advanced Powder Technology",
title = "Optimization of a nanoparticle ball milling process parameters using the response surface method",
volume = "29",
number = "9",
pages = "2129-2139",
doi = "10.1016/j.apt.2018.05.021"
}

Petrović, S., Rožić, L., Jović, V., Stojadinović, S., Grbić, B., Radić, N., Lamovec, J.,& Vasilić, R.. (2018). Optimization of a nanoparticle ball milling process parameters using the response surface method. in Advanced Powder Technology
Elsevier., 29(9), 2129-2139.
https://doi.org/10.1016/j.apt.2018.05.021

Petrović S, Rožić L, Jović V, Stojadinović S, Grbić B, Radić N, Lamovec J, Vasilić R. Optimization of a nanoparticle ball milling process parameters using the response surface method. in Advanced Powder Technology. 2018;29(9):2129-2139.
doi:10.1016/j.apt.2018.05.021 .

Petrović, Srđan, Rožić, Ljiljana, Jović, Vesna, Stojadinović, Stevan, Grbić, Boško, Radić, Nenad, Lamovec, Jelena, Vasilić, Rastko, "Optimization of a nanoparticle ball milling process parameters using the response surface method" in Advanced Powder Technology, 29, no. 9 (2018):2129-2139,
https://doi.org/10.1016/j.apt.2018.05.021 . .

TY  - JOUR
AU  - Petrović, Srđan
AU  - Rožić, Ljiljana
AU  - Vuković, Zorica
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Stojadinović, Stevan
AU  - Vasilić, Rastko
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2078
AB  - This article presents the comparison of structural and fractal properties of nanocrystalline titanium dioxide (TiO2) and TiO2 modified with tungstophosphoric acid (TiO2/HPW) and their impact on the photocatalytic degradation of hazardous water pollutants. TiO2 and TiO2/HPW samples were synthesized by a combined solgel and hydrothermal processing. The XRD analysis of pure TiO2 samples revealed that phase composition was mainly dependent on the calcination temperature, changing from amorphous TiO2 to crystalline anatase and rutile by increasing the temperature. On the other hand, the XRD of TiO2/HPW samples calcined at temperatures above 600 degrees C showed crystalline peaks associated to formation of WO3 and WO2.92 crystalline domains. The N-2 adsorption-desorption isotherm and pore size distribution of TiO2/HPW samples detected the existence of mesoporous characteristic with very narrow bimodal pores in the mesoporous region. The structural heterogeneity of samples was analyzed by means of pore size distribution functions, while the variation in fractal dimension were determined from the nitrogen adsorption isotherms, using the modified Frenkel-Halsey-Hill method. The results demonstrate that the approach is capable of characterizing complex textures such as those present in the TiO2 and TiO2/HPW photocatalysts. Besides, the effect of calcinations condition on photocatalytic properties of the samples was also investigated. The highest efficiency with respect to methyl orange photodecomposition was observed for TiO2/HPW photocatalysts calcined at 700 degrees C.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Journal of Physics and Chemistry of Solids
T1  - Structural and fractal characterization of tungstophosphoric acid modified titanium dioxide photocatalyst
VL  - 103
SP  - 95
EP  - 102
DO  - 10.1016/j.jpcs.2016.12.002
ER  - 

@article{
author = "Petrović, Srđan and Rožić, Ljiljana and Vuković, Zorica and Grbić, Boško and Radić, Nenad and Stojadinović, Stevan and Vasilić, Rastko",
year = "2017",
abstract = "This article presents the comparison of structural and fractal properties of nanocrystalline titanium dioxide (TiO2) and TiO2 modified with tungstophosphoric acid (TiO2/HPW) and their impact on the photocatalytic degradation of hazardous water pollutants. TiO2 and TiO2/HPW samples were synthesized by a combined solgel and hydrothermal processing. The XRD analysis of pure TiO2 samples revealed that phase composition was mainly dependent on the calcination temperature, changing from amorphous TiO2 to crystalline anatase and rutile by increasing the temperature. On the other hand, the XRD of TiO2/HPW samples calcined at temperatures above 600 degrees C showed crystalline peaks associated to formation of WO3 and WO2.92 crystalline domains. The N-2 adsorption-desorption isotherm and pore size distribution of TiO2/HPW samples detected the existence of mesoporous characteristic with very narrow bimodal pores in the mesoporous region. The structural heterogeneity of samples was analyzed by means of pore size distribution functions, while the variation in fractal dimension were determined from the nitrogen adsorption isotherms, using the modified Frenkel-Halsey-Hill method. The results demonstrate that the approach is capable of characterizing complex textures such as those present in the TiO2 and TiO2/HPW photocatalysts. Besides, the effect of calcinations condition on photocatalytic properties of the samples was also investigated. The highest efficiency with respect to methyl orange photodecomposition was observed for TiO2/HPW photocatalysts calcined at 700 degrees C.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Journal of Physics and Chemistry of Solids",
title = "Structural and fractal characterization of tungstophosphoric acid modified titanium dioxide photocatalyst",
volume = "103",
pages = "95-102",
doi = "10.1016/j.jpcs.2016.12.002"
}

Petrović, S., Rožić, L., Vuković, Z., Grbić, B., Radić, N., Stojadinović, S.,& Vasilić, R.. (2017). Structural and fractal characterization of tungstophosphoric acid modified titanium dioxide photocatalyst. in Journal of Physics and Chemistry of Solids
Oxford : Pergamon-Elsevier Science Ltd., 103, 95-102.
https://doi.org/10.1016/j.jpcs.2016.12.002

Petrović S, Rožić L, Vuković Z, Grbić B, Radić N, Stojadinović S, Vasilić R. Structural and fractal characterization of tungstophosphoric acid modified titanium dioxide photocatalyst. in Journal of Physics and Chemistry of Solids. 2017;103:95-102.
doi:10.1016/j.jpcs.2016.12.002 .

Petrović, Srđan, Rožić, Ljiljana, Vuković, Zorica, Grbić, Boško, Radić, Nenad, Stojadinović, Stevan, Vasilić, Rastko, "Structural and fractal characterization of tungstophosphoric acid modified titanium dioxide photocatalyst" in Journal of Physics and Chemistry of Solids, 103 (2017):95-102,
https://doi.org/10.1016/j.jpcs.2016.12.002 . .

TY  - JOUR
AU  - Radić, Nenad
AU  - Grbić, Boško
AU  - Stojadinović, Stevan
AU  - Vasilić, Rastko
AU  - Petrović, Srđan
AU  - Rožić, Ljiljana
AU  - Stefanov, Plamen
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2259
AB  - Pt-Ba-Al2O3 coatings were obtained by spray pyrolysis deposition on stainless steel foil. The XRD results showed that the coatings consisted from Ba carbonate and Pt (fcc) phases. SEM micrographs demonstrated that the coatings are smooth and compact. The XPS data confirmed that Ba and Pt are in close contact. Pt crystallite size is only slightly influenced by the order of Pt and Ba deposition and the dispersion of Pt is in the narrow range from 28 to 33% for all samples. Catalyst component deposition order affects NOx storage capacity. Simultaneous deposition of Ba and Pt on already formed Al2O3 substrate produces the most efficient catalyst. Pt deposited on top of the Ba layer results in slightly reduced NOx storage capacity, while deposition of Pt on the separated layer with Ba layer on top significantly reduces the ability for NOx storage.
PB  - Elsevier Science Sa, Lausanne
T2  - Thin Solid Films
T1  - Preparation and characterization of Pt-Ba-Al2O3 coatings obtained by spray pyrolysis
VL  - 628
SP  - 7
EP  - 12
DO  - 10.1016/j.tsf.2017.03.007
ER  - 

@article{
author = "Radić, Nenad and Grbić, Boško and Stojadinović, Stevan and Vasilić, Rastko and Petrović, Srđan and Rožić, Ljiljana and Stefanov, Plamen",
year = "2017",
abstract = "Pt-Ba-Al2O3 coatings were obtained by spray pyrolysis deposition on stainless steel foil. The XRD results showed that the coatings consisted from Ba carbonate and Pt (fcc) phases. SEM micrographs demonstrated that the coatings are smooth and compact. The XPS data confirmed that Ba and Pt are in close contact. Pt crystallite size is only slightly influenced by the order of Pt and Ba deposition and the dispersion of Pt is in the narrow range from 28 to 33% for all samples. Catalyst component deposition order affects NOx storage capacity. Simultaneous deposition of Ba and Pt on already formed Al2O3 substrate produces the most efficient catalyst. Pt deposited on top of the Ba layer results in slightly reduced NOx storage capacity, while deposition of Pt on the separated layer with Ba layer on top significantly reduces the ability for NOx storage.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Thin Solid Films",
title = "Preparation and characterization of Pt-Ba-Al2O3 coatings obtained by spray pyrolysis",
volume = "628",
pages = "7-12",
doi = "10.1016/j.tsf.2017.03.007"
}

Radić, N., Grbić, B., Stojadinović, S., Vasilić, R., Petrović, S., Rožić, L.,& Stefanov, P.. (2017). Preparation and characterization of Pt-Ba-Al2O3 coatings obtained by spray pyrolysis. in Thin Solid Films
Elsevier Science Sa, Lausanne., 628, 7-12.
https://doi.org/10.1016/j.tsf.2017.03.007

Radić N, Grbić B, Stojadinović S, Vasilić R, Petrović S, Rožić L, Stefanov P. Preparation and characterization of Pt-Ba-Al2O3 coatings obtained by spray pyrolysis. in Thin Solid Films. 2017;628:7-12.
doi:10.1016/j.tsf.2017.03.007 .

Radić, Nenad, Grbić, Boško, Stojadinović, Stevan, Vasilić, Rastko, Petrović, Srđan, Rožić, Ljiljana, Stefanov, Plamen, "Preparation and characterization of Pt-Ba-Al2O3 coatings obtained by spray pyrolysis" in Thin Solid Films, 628 (2017):7-12,
https://doi.org/10.1016/j.tsf.2017.03.007 . .

TY  - JOUR
AU  - Petrović, Srđan
AU  - Stojadinović, Stevan D.J.
AU  - Rožić, Ljiljana
AU  - Radić, Nenad
AU  - Grbić, Boško
AU  - Vasilić, Rastko
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1752
AB  - Plasma electrolytic oxidation of titanium in 12-tungstosilicic acid solution was investigated as a model reaction. The influence of the process parameters (concentration of 12-tungstosilicic acid solution, current density, and time) on the selected process response (efficiency of the methyl orange photodecolorization on the TiO2/WO3 coatings) was studied. A mathematical model was developed using a second-order response surface model with a central composite design incorporating the above-mentioned process parameters. The statistical analysis of experimental data indicates that a concentration of 12-tungstosilicic acid solution; process time, interaction between concentration and process time, and interaction between concentration and quadratic of process time have a significant effect on the methyl orange photodecolorization. Besides, the results show that obtained data were adequately fitted into the second-order polynomial model, since the calculated model F value (39.28) is higher than the critical F value. The values of coefficient of determination (R-2 = 0.960) and adjusted coefficient of determination (R-Adj.(2) = 0.937) are close to 1, indicating a high correlation between the observed and the predicted values. This model can also be useful for setting an optimum value of the process parameters for achieving the maximum efficiency of the methyl orange photodecolorization. Under the optimum conditions established in the region of experimentation (C = 1.14 . 10(-3) M, j = 153 mA/cm(2), and t = 58.9 s), a 38.6% (test duration of 8 h) efficiency of the methyl orange photodecolorization is obtained.
PB  - Elsevier
T2  - Surface and Coatings Technology
T1  - Process modelling and analysis of plasma electrolytic oxidation of titanium for TiO2/WO3 thin film photocatalysts by response surface methodology
VL  - 269
SP  - 250
EP  - 257
DO  - 10.1016/j.surfcoat.2014.12.026
ER  - 

@article{
author = "Petrović, Srđan and Stojadinović, Stevan D.J. and Rožić, Ljiljana and Radić, Nenad and Grbić, Boško and Vasilić, Rastko",
year = "2015",
abstract = "Plasma electrolytic oxidation of titanium in 12-tungstosilicic acid solution was investigated as a model reaction. The influence of the process parameters (concentration of 12-tungstosilicic acid solution, current density, and time) on the selected process response (efficiency of the methyl orange photodecolorization on the TiO2/WO3 coatings) was studied. A mathematical model was developed using a second-order response surface model with a central composite design incorporating the above-mentioned process parameters. The statistical analysis of experimental data indicates that a concentration of 12-tungstosilicic acid solution; process time, interaction between concentration and process time, and interaction between concentration and quadratic of process time have a significant effect on the methyl orange photodecolorization. Besides, the results show that obtained data were adequately fitted into the second-order polynomial model, since the calculated model F value (39.28) is higher than the critical F value. The values of coefficient of determination (R-2 = 0.960) and adjusted coefficient of determination (R-Adj.(2) = 0.937) are close to 1, indicating a high correlation between the observed and the predicted values. This model can also be useful for setting an optimum value of the process parameters for achieving the maximum efficiency of the methyl orange photodecolorization. Under the optimum conditions established in the region of experimentation (C = 1.14 . 10(-3) M, j = 153 mA/cm(2), and t = 58.9 s), a 38.6% (test duration of 8 h) efficiency of the methyl orange photodecolorization is obtained.",
publisher = "Elsevier",
journal = "Surface and Coatings Technology",
title = "Process modelling and analysis of plasma electrolytic oxidation of titanium for TiO2/WO3 thin film photocatalysts by response surface methodology",
volume = "269",
pages = "250-257",
doi = "10.1016/j.surfcoat.2014.12.026"
}

Petrović, S., Stojadinović, S. D.J., Rožić, L., Radić, N., Grbić, B.,& Vasilić, R.. (2015). Process modelling and analysis of plasma electrolytic oxidation of titanium for TiO2/WO3 thin film photocatalysts by response surface methodology. in Surface and Coatings Technology
Elsevier., 269, 250-257.
https://doi.org/10.1016/j.surfcoat.2014.12.026

Petrović S, Stojadinović SD, Rožić L, Radić N, Grbić B, Vasilić R. Process modelling and analysis of plasma electrolytic oxidation of titanium for TiO2/WO3 thin film photocatalysts by response surface methodology. in Surface and Coatings Technology. 2015;269:250-257.
doi:10.1016/j.surfcoat.2014.12.026 .

Petrović, Srđan, Stojadinović, Stevan D.J., Rožić, Ljiljana, Radić, Nenad, Grbić, Boško, Vasilić, Rastko, "Process modelling and analysis of plasma electrolytic oxidation of titanium for TiO2/WO3 thin film photocatalysts by response surface methodology" in Surface and Coatings Technology, 269 (2015):250-257,
https://doi.org/10.1016/j.surfcoat.2014.12.026 . .

TY  - JOUR
AU  - Rožić, Ljiljana
AU  - Grbić, Boško
AU  - Petrović, Srđan
AU  - Radić, Nenad
AU  - Damjanović, Ljiljana
AU  - Vuković, Zorica
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1788
AB  - This paper provides the correlation between the catalytic activity and selectivity of catalysts with various loadings of heteropolyacids over bentonite in the vapour phase 2-propanol oxidation. The catalysts are characterised by energy dispersive spectroscopy, differential scanning calorimeter, ammonia temperature programmed desorption, infrared spectroscopy and a nitrogen adsorption/desorption method. Energy dispersive spectroscopy results have shown satisfactory agreement regarding chemical composition that corresponds to the desired content of heteropolyacids on bentonite. Thermal analysis confirmed the thermal stability of catalysts under the investigated region of oxidation reaction. NH3-TPD spectra demonstrated that all catalysts include two types of acidic sites: weak adsorption centres up to 390 K and a broad distribution of stronger acidic sites at higher temperatures. The catalysts were active in the vapour-phase conversion of 2-propanol to acetone in the temperature region of 343-553 K. An increase of HPW loading improves selectivity towards acetone formation.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Chemistry and Physics
T1  - The tungsten heteropolyacid supported on activated bentonites as catalyst for selective oxidation of 2-propanol
VL  - 167
SP  - 42
EP  - 48
DO  - 10.1016/j.matchemphys.2015.09.040
ER  - 

@article{
author = "Rožić, Ljiljana and Grbić, Boško and Petrović, Srđan and Radić, Nenad and Damjanović, Ljiljana and Vuković, Zorica",
year = "2015",
abstract = "This paper provides the correlation between the catalytic activity and selectivity of catalysts with various loadings of heteropolyacids over bentonite in the vapour phase 2-propanol oxidation. The catalysts are characterised by energy dispersive spectroscopy, differential scanning calorimeter, ammonia temperature programmed desorption, infrared spectroscopy and a nitrogen adsorption/desorption method. Energy dispersive spectroscopy results have shown satisfactory agreement regarding chemical composition that corresponds to the desired content of heteropolyacids on bentonite. Thermal analysis confirmed the thermal stability of catalysts under the investigated region of oxidation reaction. NH3-TPD spectra demonstrated that all catalysts include two types of acidic sites: weak adsorption centres up to 390 K and a broad distribution of stronger acidic sites at higher temperatures. The catalysts were active in the vapour-phase conversion of 2-propanol to acetone in the temperature region of 343-553 K. An increase of HPW loading improves selectivity towards acetone formation.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Chemistry and Physics",
title = "The tungsten heteropolyacid supported on activated bentonites as catalyst for selective oxidation of 2-propanol",
volume = "167",
pages = "42-48",
doi = "10.1016/j.matchemphys.2015.09.040"
}

Rožić, L., Grbić, B., Petrović, S., Radić, N., Damjanović, L.,& Vuković, Z.. (2015). The tungsten heteropolyacid supported on activated bentonites as catalyst for selective oxidation of 2-propanol. in Materials Chemistry and Physics
Elsevier Science Sa, Lausanne., 167, 42-48.
https://doi.org/10.1016/j.matchemphys.2015.09.040

Rožić L, Grbić B, Petrović S, Radić N, Damjanović L, Vuković Z. The tungsten heteropolyacid supported on activated bentonites as catalyst for selective oxidation of 2-propanol. in Materials Chemistry and Physics. 2015;167:42-48.
doi:10.1016/j.matchemphys.2015.09.040 .

Rožić, Ljiljana, Grbić, Boško, Petrović, Srđan, Radić, Nenad, Damjanović, Ljiljana, Vuković, Zorica, "The tungsten heteropolyacid supported on activated bentonites as catalyst for selective oxidation of 2-propanol" in Materials Chemistry and Physics, 167 (2015):42-48,
https://doi.org/10.1016/j.matchemphys.2015.09.040 . .

TY  - JOUR
AU  - Novaković, Tatjana
AU  - Rožić, Ljiljana
AU  - Petrović, Srđan
AU  - Stanisavljev, Dragomir
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1839
AB  - The desorption behavior of β-carotene from a bentonite adsorbent under microwave irradiation in isopropanol was studied as a function of temperature and different initial loading concentrations. A first-order, two-component, three-parameter model described the desorption kinetics with a coefficient of de-termination R2 > 0.9932, and the β-carotene desorption process under microwave irradiation was con-trolled by both rapid and slow desorption. The activation energies of β-carotene desorption for the rapid and slow desorption processes were 19.61 and 53.04 kJ mol-1, respectively. It was observed that the de-sorption equilibrium data fitted well to both the Freundlich and Langmuir isotherms. The data obtained from the desorption-isotherm model were used to determine the thermodynamic parameters. The positive value of free energy indicates the non-spontaneity of β-carotene desorption. The change in entropy rela-tive to the enthalpy of desorption reveals that the reaction is physical in nature.
AB  - Десорпциското однесување на β-каротенот од бентонитски атсорбент беше истражувано во
услови на микробранова ирадијација како функција на температурата и различни концентрации на
полнењето. Кинтетички двокомпонентен модел од прв ред со три параметри ја опишува
десорпциската кинетика со коефицинет на корелација R
2
> 0.9932. Десорпцискиот процес на βкаротенот во услови на микробранова ирадијација е контролиран и со брза и со бавна десорпција.
Активациските енергии на десорпцијата на β-каротенот за брзата и за бавната десорпција
соодветно изнесуваат 19,61 kJ mol–1
и 53,04 kJ mol–1
. Забележано е дека десорпциската рамнотежа
добро се вклопува во изотермите на Freundlich и на Langmuir. Добиените податоци на моделот на
десорпциската изотерма се употребени за определување на термодинамички параметри.
Позитивната вредност на слободната енергија укажува на неспонтаност на десорпцијата на βкаротенот. Промената на ентропијата во однос на енталпијата укажува дека десопцијата по
природа е физичка.
PB  - Macedonian Journal of Chemistry and Chemical Engineering
T2  - Macedonian Journal of Chemistry and Chemical Engineering
T1  - Desorption of β-carotene from bentonite adsorbent under microwave irradiation
T1  - ДЕСОРПЦИЈА НА β-КАРОТЕН ОД БЕНТОНИТСКИ АТСОРБЕНТ ВО УСЛОВИ НА МИКРОБРАНОВА ИРАДИЈАЦИЈА
VL  - 34
IS  - 2
SP  - 363
EP  - 371
UR  - https://hdl.handle.net/21.15107/rcub_cer_1839
ER  - 

@article{
author = "Novaković, Tatjana and Rožić, Ljiljana and Petrović, Srđan and Stanisavljev, Dragomir",
year = "2015",
abstract = "The desorption behavior of β-carotene from a bentonite adsorbent under microwave irradiation in isopropanol was studied as a function of temperature and different initial loading concentrations. A first-order, two-component, three-parameter model described the desorption kinetics with a coefficient of de-termination R2 > 0.9932, and the β-carotene desorption process under microwave irradiation was con-trolled by both rapid and slow desorption. The activation energies of β-carotene desorption for the rapid and slow desorption processes were 19.61 and 53.04 kJ mol-1, respectively. It was observed that the de-sorption equilibrium data fitted well to both the Freundlich and Langmuir isotherms. The data obtained from the desorption-isotherm model were used to determine the thermodynamic parameters. The positive value of free energy indicates the non-spontaneity of β-carotene desorption. The change in entropy rela-tive to the enthalpy of desorption reveals that the reaction is physical in nature., Десорпциското однесување на β-каротенот од бентонитски атсорбент беше истражувано во
услови на микробранова ирадијација како функција на температурата и различни концентрации на
полнењето. Кинтетички двокомпонентен модел од прв ред со три параметри ја опишува
десорпциската кинетика со коефицинет на корелација R
2
> 0.9932. Десорпцискиот процес на βкаротенот во услови на микробранова ирадијација е контролиран и со брза и со бавна десорпција.
Активациските енергии на десорпцијата на β-каротенот за брзата и за бавната десорпција
соодветно изнесуваат 19,61 kJ mol–1
и 53,04 kJ mol–1
. Забележано е дека десорпциската рамнотежа
добро се вклопува во изотермите на Freundlich и на Langmuir. Добиените податоци на моделот на
десорпциската изотерма се употребени за определување на термодинамички параметри.
Позитивната вредност на слободната енергија укажува на неспонтаност на десорпцијата на βкаротенот. Промената на ентропијата во однос на енталпијата укажува дека десопцијата по
природа е физичка.",
publisher = "Macedonian Journal of Chemistry and Chemical Engineering",
journal = "Macedonian Journal of Chemistry and Chemical Engineering",
title = "Desorption of β-carotene from bentonite adsorbent under microwave irradiation, ДЕСОРПЦИЈА НА β-КАРОТЕН ОД БЕНТОНИТСКИ АТСОРБЕНТ ВО УСЛОВИ НА МИКРОБРАНОВА ИРАДИЈАЦИЈА",
volume = "34",
number = "2",
pages = "363-371",
url = "https://hdl.handle.net/21.15107/rcub_cer_1839"
}

Novaković, T., Rožić, L., Petrović, S.,& Stanisavljev, D.. (2015). Desorption of β-carotene from bentonite adsorbent under microwave irradiation. in Macedonian Journal of Chemistry and Chemical Engineering
Macedonian Journal of Chemistry and Chemical Engineering., 34(2), 363-371.
https://hdl.handle.net/21.15107/rcub_cer_1839

Novaković T, Rožić L, Petrović S, Stanisavljev D. Desorption of β-carotene from bentonite adsorbent under microwave irradiation. in Macedonian Journal of Chemistry and Chemical Engineering. 2015;34(2):363-371.
https://hdl.handle.net/21.15107/rcub_cer_1839 .

Novaković, Tatjana, Rožić, Ljiljana, Petrović, Srđan, Stanisavljev, Dragomir, "Desorption of β-carotene from bentonite adsorbent under microwave irradiation" in Macedonian Journal of Chemistry and Chemical Engineering, 34, no. 2 (2015):363-371,
https://hdl.handle.net/21.15107/rcub_cer_1839 .

TY  - JOUR
AU  - Novaković, Tatjana
AU  - Rožić, Ljiljana
AU  - Petrović, Srđan
AU  - Vuković, Zorica
AU  - Mitrić, Miodrag
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1799
AB  - A statistical design was used to investigate the effect of various processing conditions on the structure of sol-gel derived Mg(II) doped alumina. Six process variables were selected based on the Plackett-Burman design: concentration of magnesium nitrate, time and temperature of alcohol evaporation, temperature and time of annealing and heating rate were changed at two levels. For every set of conditions, samples with different specific surface area and degree of crystallinity were obtained. Analysis of the results showed that the annealing temperature, heating rate and concentration of magnesium nitrate were the main factors affecting the average crystallite size of the predominant alumina phase. In the case of the specific surface area, two of selected six variables had pronounced effects; however, the temperature of annealing was more effective than others. The present results showed that the proposed model that uses crystallite size as a response variable is preferable to other research.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Study of the effect of Mg(II) addition and the annealing conditions on the structure of mesoporous aluminum oxide using Plackett-Burman design
VL  - 80
IS  - 12
SP  - 1529
EP  - 1540
DO  - 10.2298/JSC141113056N
ER  - 

@article{
author = "Novaković, Tatjana and Rožić, Ljiljana and Petrović, Srđan and Vuković, Zorica and Mitrić, Miodrag",
year = "2015",
abstract = "A statistical design was used to investigate the effect of various processing conditions on the structure of sol-gel derived Mg(II) doped alumina. Six process variables were selected based on the Plackett-Burman design: concentration of magnesium nitrate, time and temperature of alcohol evaporation, temperature and time of annealing and heating rate were changed at two levels. For every set of conditions, samples with different specific surface area and degree of crystallinity were obtained. Analysis of the results showed that the annealing temperature, heating rate and concentration of magnesium nitrate were the main factors affecting the average crystallite size of the predominant alumina phase. In the case of the specific surface area, two of selected six variables had pronounced effects; however, the temperature of annealing was more effective than others. The present results showed that the proposed model that uses crystallite size as a response variable is preferable to other research.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Study of the effect of Mg(II) addition and the annealing conditions on the structure of mesoporous aluminum oxide using Plackett-Burman design",
volume = "80",
number = "12",
pages = "1529-1540",
doi = "10.2298/JSC141113056N"
}

Novaković, T., Rožić, L., Petrović, S., Vuković, Z.,& Mitrić, M.. (2015). Study of the effect of Mg(II) addition and the annealing conditions on the structure of mesoporous aluminum oxide using Plackett-Burman design. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 80(12), 1529-1540.
https://doi.org/10.2298/JSC141113056N

Novaković T, Rožić L, Petrović S, Vuković Z, Mitrić M. Study of the effect of Mg(II) addition and the annealing conditions on the structure of mesoporous aluminum oxide using Plackett-Burman design. in Journal of the Serbian Chemical Society. 2015;80(12):1529-1540.
doi:10.2298/JSC141113056N .

Novaković, Tatjana, Rožić, Ljiljana, Petrović, Srđan, Vuković, Zorica, Mitrić, Miodrag, "Study of the effect of Mg(II) addition and the annealing conditions on the structure of mesoporous aluminum oxide using Plackett-Burman design" in Journal of the Serbian Chemical Society, 80, no. 12 (2015):1529-1540,
https://doi.org/10.2298/JSC141113056N . .

TY  - JOUR
AU  - Petrović, Srđan
AU  - Rožić, Ljiljana
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Dostanić, Jasmina
AU  - Stojadinović, Stevan
AU  - Vasilić, Rastko
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1233
AB  - The influence of annealing temperature on the morphology and surface fractal dimension of titanium dioxide (TiO2) films prepared via the spray deposition process was investigated. Thin films with various morphologies were obtained at different temperatures and characterized by X-ray diffraction and atomic force microscopy (AFM). It was found that the crystalline structure of TiO2 films depends strongly on annealing temperature. At higher temperatures, the partial phase transformation of anatase-to-rutile was observed. The morphology and surface fractal dimensions were evaluated by image analysis methods based on AFM micrographs. The results indicate that the value of surface roughness (the standard deviation of the height values within the given area of AFM image) of TiO(2)films increases with increasing annealing temperature. Fractal analysis revealed that the value of the fractal dimension of the samples decreases slowly from 2.23 to 2.15 following the annealing process.
PB  - Soc Chemists Technologists Madeconia, Skopje
T2  - Macedonian Journal of Chemistry and Chemical Engineering
T1  - Morphology and fractal dimension of tio2 thin films
VL  - 32
IS  - 2
SP  - 309
EP  - 317
UR  - https://hdl.handle.net/21.15107/rcub_cer_1233
ER  - 

@article{
author = "Petrović, Srđan and Rožić, Ljiljana and Grbić, Boško and Radić, Nenad and Dostanić, Jasmina and Stojadinović, Stevan and Vasilić, Rastko",
year = "2013",
abstract = "The influence of annealing temperature on the morphology and surface fractal dimension of titanium dioxide (TiO2) films prepared via the spray deposition process was investigated. Thin films with various morphologies were obtained at different temperatures and characterized by X-ray diffraction and atomic force microscopy (AFM). It was found that the crystalline structure of TiO2 films depends strongly on annealing temperature. At higher temperatures, the partial phase transformation of anatase-to-rutile was observed. The morphology and surface fractal dimensions were evaluated by image analysis methods based on AFM micrographs. The results indicate that the value of surface roughness (the standard deviation of the height values within the given area of AFM image) of TiO(2)films increases with increasing annealing temperature. Fractal analysis revealed that the value of the fractal dimension of the samples decreases slowly from 2.23 to 2.15 following the annealing process.",
publisher = "Soc Chemists Technologists Madeconia, Skopje",
journal = "Macedonian Journal of Chemistry and Chemical Engineering",
title = "Morphology and fractal dimension of tio2 thin films",
volume = "32",
number = "2",
pages = "309-317",
url = "https://hdl.handle.net/21.15107/rcub_cer_1233"
}

Petrović, S., Rožić, L., Grbić, B., Radić, N., Dostanić, J., Stojadinović, S.,& Vasilić, R.. (2013). Morphology and fractal dimension of tio2 thin films. in Macedonian Journal of Chemistry and Chemical Engineering
Soc Chemists Technologists Madeconia, Skopje., 32(2), 309-317.
https://hdl.handle.net/21.15107/rcub_cer_1233

Petrović S, Rožić L, Grbić B, Radić N, Dostanić J, Stojadinović S, Vasilić R. Morphology and fractal dimension of tio2 thin films. in Macedonian Journal of Chemistry and Chemical Engineering. 2013;32(2):309-317.
https://hdl.handle.net/21.15107/rcub_cer_1233 .

Petrović, Srđan, Rožić, Ljiljana, Grbić, Boško, Radić, Nenad, Dostanić, Jasmina, Stojadinović, Stevan, Vasilić, Rastko, "Morphology and fractal dimension of tio2 thin films" in Macedonian Journal of Chemistry and Chemical Engineering, 32, no. 2 (2013):309-317,
https://hdl.handle.net/21.15107/rcub_cer_1233 .

TY  - JOUR
AU  - Rožić, Ljiljana
AU  - Petrović, Srđan
AU  - Radić, Nenad
AU  - Stojadinović, Stevan D.J.
AU  - Vasilić, Rastko
AU  - Stefanov, P.
AU  - Grbić, Boško
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1341
AB  - In this study, we have shown that atomic force microscopy is a powerful technique to study the fractal parameters of TiO2/WO3 coatings prepared by plasma electrolytic oxidation (PEO) process. Since the surface roughness of obtained oxide coatings affects their physical properties, an accurate description of roughness parameters is highly desirable. The surface roughness, described by root mean squared and arithmetic average values, is analyzed considering the scans of a series of atomic force micrographs. The results show that the oxide coatings exhibit lower surface roughness in initial stage of PEO process. Also, the surfaces of TiO2/WO3 coatings exhibit fractal behavior. Positive correlation between the fractal dimension and surface roughness of the surfaces of TiO2/WO3 coatings in initial stage of PEO process was found.
PB  - Elsevier Science Sa, Lausanne
T2  - Thin Solid Films
T1  - Fractal approach to surface roughness of TiO2/WO3 coatings formed by plasma electrolytic oxidation process
VL  - 539
SP  - 112
EP  - 116
DO  - 10.1016/j.tsf.2013.05.051
ER  - 

@article{
author = "Rožić, Ljiljana and Petrović, Srđan and Radić, Nenad and Stojadinović, Stevan D.J. and Vasilić, Rastko and Stefanov, P. and Grbić, Boško",
year = "2013",
abstract = "In this study, we have shown that atomic force microscopy is a powerful technique to study the fractal parameters of TiO2/WO3 coatings prepared by plasma electrolytic oxidation (PEO) process. Since the surface roughness of obtained oxide coatings affects their physical properties, an accurate description of roughness parameters is highly desirable. The surface roughness, described by root mean squared and arithmetic average values, is analyzed considering the scans of a series of atomic force micrographs. The results show that the oxide coatings exhibit lower surface roughness in initial stage of PEO process. Also, the surfaces of TiO2/WO3 coatings exhibit fractal behavior. Positive correlation between the fractal dimension and surface roughness of the surfaces of TiO2/WO3 coatings in initial stage of PEO process was found.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Thin Solid Films",
title = "Fractal approach to surface roughness of TiO2/WO3 coatings formed by plasma electrolytic oxidation process",
volume = "539",
pages = "112-116",
doi = "10.1016/j.tsf.2013.05.051"
}

Rožić, L., Petrović, S., Radić, N., Stojadinović, S. D.J., Vasilić, R., Stefanov, P.,& Grbić, B.. (2013). Fractal approach to surface roughness of TiO2/WO3 coatings formed by plasma electrolytic oxidation process. in Thin Solid Films
Elsevier Science Sa, Lausanne., 539, 112-116.
https://doi.org/10.1016/j.tsf.2013.05.051

Rožić L, Petrović S, Radić N, Stojadinović SD, Vasilić R, Stefanov P, Grbić B. Fractal approach to surface roughness of TiO2/WO3 coatings formed by plasma electrolytic oxidation process. in Thin Solid Films. 2013;539:112-116.
doi:10.1016/j.tsf.2013.05.051 .

Rožić, Ljiljana, Petrović, Srđan, Radić, Nenad, Stojadinović, Stevan D.J., Vasilić, Rastko, Stefanov, P., Grbić, Boško, "Fractal approach to surface roughness of TiO2/WO3 coatings formed by plasma electrolytic oxidation process" in Thin Solid Films, 539 (2013):112-116,
https://doi.org/10.1016/j.tsf.2013.05.051 . .

TY  - JOUR
AU  - Dostanić, Jasmina
AU  - Lončarević, Davor
AU  - Rožić, Ljiljana
AU  - Petrović, Srđan
AU  - Mijin, Dušan
AU  - Jovanović, Dušan M.
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1352
AB  - Response surface methodology (RSM) and central composite design have been applied to describe and optimize photocatalytic degradation of azo pyridone dye using TiO2, H2O2, and simulated sun light. The mutual interactions between three independent variables, viz. H2O2 concentration, irradiation time, and TiO2 content were obtained. The results revealed that the most influential variables under selected reaction conditions were irradiation time and TiO2 content. The optimized conditions for the photocatalytic degradation of azo pyridone dye were as follows: H2O2 concentration: 130.5 mg/L, irradiation time: 54.8 min, and TiO2 content: 2.48 g/L. Under these conditions, the maximum decolorization efficiency of 96.43% was achieved. This experimental value was in good agreement with the predicted one, which proved the validity of the model. Operation cost analysis indicated that irradiation time had the major influence on total process cost. The RSM based on the central composite design was shown to be a successful technique for the optimization of the decolorization efficiency of azo pyridone dye and can be very helpful in improving the process economic feasibility. TOC analysis showed that the dye could be effectively mineralized during photocatalytic degradation.
PB  - Desalination Publ, Hopkinton
T2  - Desalination and Water Treatment
T1  - Photocatalytic degradation of azo pyridone dye: Optimization using response surface methodology
VL  - 51
IS  - 13-15
SP  - 2802
EP  - 2812
DO  - 10.1080/19443994.2012.750699
ER  - 

@article{
author = "Dostanić, Jasmina and Lončarević, Davor and Rožić, Ljiljana and Petrović, Srđan and Mijin, Dušan and Jovanović, Dušan M.",
year = "2013",
abstract = "Response surface methodology (RSM) and central composite design have been applied to describe and optimize photocatalytic degradation of azo pyridone dye using TiO2, H2O2, and simulated sun light. The mutual interactions between three independent variables, viz. H2O2 concentration, irradiation time, and TiO2 content were obtained. The results revealed that the most influential variables under selected reaction conditions were irradiation time and TiO2 content. The optimized conditions for the photocatalytic degradation of azo pyridone dye were as follows: H2O2 concentration: 130.5 mg/L, irradiation time: 54.8 min, and TiO2 content: 2.48 g/L. Under these conditions, the maximum decolorization efficiency of 96.43% was achieved. This experimental value was in good agreement with the predicted one, which proved the validity of the model. Operation cost analysis indicated that irradiation time had the major influence on total process cost. The RSM based on the central composite design was shown to be a successful technique for the optimization of the decolorization efficiency of azo pyridone dye and can be very helpful in improving the process economic feasibility. TOC analysis showed that the dye could be effectively mineralized during photocatalytic degradation.",
publisher = "Desalination Publ, Hopkinton",
journal = "Desalination and Water Treatment",
title = "Photocatalytic degradation of azo pyridone dye: Optimization using response surface methodology",
volume = "51",
number = "13-15",
pages = "2802-2812",
doi = "10.1080/19443994.2012.750699"
}

Dostanić, J., Lončarević, D., Rožić, L., Petrović, S., Mijin, D.,& Jovanović, D. M.. (2013). Photocatalytic degradation of azo pyridone dye: Optimization using response surface methodology. in Desalination and Water Treatment
Desalination Publ, Hopkinton., 51(13-15), 2802-2812.
https://doi.org/10.1080/19443994.2012.750699

Dostanić J, Lončarević D, Rožić L, Petrović S, Mijin D, Jovanović DM. Photocatalytic degradation of azo pyridone dye: Optimization using response surface methodology. in Desalination and Water Treatment. 2013;51(13-15):2802-2812.
doi:10.1080/19443994.2012.750699 .

Dostanić, Jasmina, Lončarević, Davor, Rožić, Ljiljana, Petrović, Srđan, Mijin, Dušan, Jovanović, Dušan M., "Photocatalytic degradation of azo pyridone dye: Optimization using response surface methodology" in Desalination and Water Treatment, 51, no. 13-15 (2013):2802-2812,
https://doi.org/10.1080/19443994.2012.750699 . .

TY  - JOUR
AU  - Petrović, Srđan
AU  - Rožić, Ljiljana
AU  - Vuković, Zorica
AU  - Novaković, Tatjana
AU  - Stanisavljev, Dragomir
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/946
AB  - Microwave irradiation as a means for heating bentonites during acid activation has been investigated in the past but it has never been optimized for industrial applications. The purpose of this study was to apply a factorial 2(3) experimental design to a Serbian bentonite in order to determine the influence of microwave heating on the acid-activation process. The effect of acid activation under microwave irradiation on the textural and structural properties of bentonite was studied as a model reaction. A mathematical, second-order response surface model (RSM) was developed with a central composite design that incorporated the relationships among various process parameters (time, acid concentration, and microwave heating power) and the selected process response of specific surface area of the bentonite. The ranges of values for the process parameters chosen were: time, 5-21 min; acid concentration, 2-7 M; and microwave heating power, 63-172 W. The effect of individual variables and their interaction effects on the textural and structural properties of the bentonite were determined. Statistical analysis showed that the duration of microwave irradiation was less significant than the other two factors. The model showed that increasing the time and acid concentration improved the textural properties of bentonites, resulting in increased specific surface area. This model is useful for setting an optimum value of the activation parameters for achieving the maximum specific surface area. An optimum specific surface area of 142 m(2)g(-1) was achieved with an acid concentration of 5.2 M, activation time of 7.4 min, and microwave power of 117 W.
PB  - Clay Minerals Soc, Chantilly
T2  - Clays and Clay Minerals
T1  - Response surface optimization for activation of bentonite using microwave irradiation
VL  - 60
IS  - 1
SP  - 32
EP  - 39
DO  - 10.1346/CCMN.2012.0600103
ER  - 

@article{
author = "Petrović, Srđan and Rožić, Ljiljana and Vuković, Zorica and Novaković, Tatjana and Stanisavljev, Dragomir",
year = "2012",
abstract = "Microwave irradiation as a means for heating bentonites during acid activation has been investigated in the past but it has never been optimized for industrial applications. The purpose of this study was to apply a factorial 2(3) experimental design to a Serbian bentonite in order to determine the influence of microwave heating on the acid-activation process. The effect of acid activation under microwave irradiation on the textural and structural properties of bentonite was studied as a model reaction. A mathematical, second-order response surface model (RSM) was developed with a central composite design that incorporated the relationships among various process parameters (time, acid concentration, and microwave heating power) and the selected process response of specific surface area of the bentonite. The ranges of values for the process parameters chosen were: time, 5-21 min; acid concentration, 2-7 M; and microwave heating power, 63-172 W. The effect of individual variables and their interaction effects on the textural and structural properties of the bentonite were determined. Statistical analysis showed that the duration of microwave irradiation was less significant than the other two factors. The model showed that increasing the time and acid concentration improved the textural properties of bentonites, resulting in increased specific surface area. This model is useful for setting an optimum value of the activation parameters for achieving the maximum specific surface area. An optimum specific surface area of 142 m(2)g(-1) was achieved with an acid concentration of 5.2 M, activation time of 7.4 min, and microwave power of 117 W.",
publisher = "Clay Minerals Soc, Chantilly",
journal = "Clays and Clay Minerals",
title = "Response surface optimization for activation of bentonite using microwave irradiation",
volume = "60",
number = "1",
pages = "32-39",
doi = "10.1346/CCMN.2012.0600103"
}

Petrović, S., Rožić, L., Vuković, Z., Novaković, T.,& Stanisavljev, D.. (2012). Response surface optimization for activation of bentonite using microwave irradiation. in Clays and Clay Minerals
Clay Minerals Soc, Chantilly., 60(1), 32-39.
https://doi.org/10.1346/CCMN.2012.0600103

Petrović S, Rožić L, Vuković Z, Novaković T, Stanisavljev D. Response surface optimization for activation of bentonite using microwave irradiation. in Clays and Clay Minerals. 2012;60(1):32-39.
doi:10.1346/CCMN.2012.0600103 .

Petrović, Srđan, Rožić, Ljiljana, Vuković, Zorica, Novaković, Tatjana, Stanisavljev, Dragomir, "Response surface optimization for activation of bentonite using microwave irradiation" in Clays and Clay Minerals, 60, no. 1 (2012):32-39,
https://doi.org/10.1346/CCMN.2012.0600103 . .

TY  - JOUR
AU  - Rožić, Ljiljana
AU  - Novaković, Tatjana
AU  - Petrović, Srđan
AU  - Vuković, Zorica
AU  - Stanisavljev, Dragomir
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1074
AB  - In this paper the effect of acid activation by conventional and under microwave irradiation on the textural and structural properties of bentonite was studied. The adsorbents were characterized by powder X-ray diffraction and the BET method using the nitrogen adsorption technique. The XRD patterns of raw clay demonstrated maximum intensities within the ranges typical for smectite group minerals. From X-ray powder diffraction patterns of both activated samples absent of calcite characteristic reflection was confirmed. Higher degree of dealumination and decationization was achieved for sample activated by conventional, as can be determined from XRD patterns. Sorption analysis results showed that activated bentonite samples contain slit shaped pores, and meso- and microporosity better than natural bentonite. Sample activated under microwave irradiation has developed microporosity and high specific surface area, with no leaching of the structural cautions.
AB  - U ovom radu je ispitivan uticaj hemijske aktivacije, na konvencionalan način i aktivacije u mikrotalasnom polju, na strukturna i teksturalna svojstva dobijenog adsorbensa. Kao polazni materijal korišćen je bentonit. Kao metode karakterizacije korišćene su rendgenska difrakcija i BET-metoda analize niskotemperaturnih adsorpciono-desorpcionih izotermi azota. Rendgenskom difrakcijom na prahu je utvrđeno da je smektitna faza dominantna. Nakon aktivacije kod oba aktivirana uzorka uočen je gubitak karakteristične refleksije kalcita usled rastvaranja u kiseloj sredini. Hemijska analiza je pokazala da je veći stepen dealuminacije i dekatjonizacije postignut kod uzorka aktiviranog na konvencionalan način, što je potvrđeno i difraktogramima praha uzoraka. Rezultati sorpcione analize su pokazali da aktivirani uzorci sadrže pore tipa prskotina i da imaju bolje razvijenu poroznost u oblasti mikro i mezopora od prirodnog bentonita. Kod uzorka aktiviranog u mikrotalasnom polju došlo je do razvoja mezoporozne strukture i rasta specifične površine, a da je pri tome očuvana smektitna struktura u većoj meri nego kod uzorka sintetisanog na konvencionalan način.
PB  - Savez inženjera i tehničara Srbije
T2  - Tehnika
T1  - Properties of adsorbent obtained by conventional and under microwave irradiation
T1  - Svojstva adsorbensa dobijenog aktivacijom bentonita na konvencionalan način i u mikrotalasnom polju
VL  - 67
IS  - 1
SP  - 17
EP  - 21
UR  - https://hdl.handle.net/21.15107/rcub_cer_1074
ER  - 

@article{
author = "Rožić, Ljiljana and Novaković, Tatjana and Petrović, Srđan and Vuković, Zorica and Stanisavljev, Dragomir",
year = "2012",
abstract = "In this paper the effect of acid activation by conventional and under microwave irradiation on the textural and structural properties of bentonite was studied. The adsorbents were characterized by powder X-ray diffraction and the BET method using the nitrogen adsorption technique. The XRD patterns of raw clay demonstrated maximum intensities within the ranges typical for smectite group minerals. From X-ray powder diffraction patterns of both activated samples absent of calcite characteristic reflection was confirmed. Higher degree of dealumination and decationization was achieved for sample activated by conventional, as can be determined from XRD patterns. Sorption analysis results showed that activated bentonite samples contain slit shaped pores, and meso- and microporosity better than natural bentonite. Sample activated under microwave irradiation has developed microporosity and high specific surface area, with no leaching of the structural cautions., U ovom radu je ispitivan uticaj hemijske aktivacije, na konvencionalan način i aktivacije u mikrotalasnom polju, na strukturna i teksturalna svojstva dobijenog adsorbensa. Kao polazni materijal korišćen je bentonit. Kao metode karakterizacije korišćene su rendgenska difrakcija i BET-metoda analize niskotemperaturnih adsorpciono-desorpcionih izotermi azota. Rendgenskom difrakcijom na prahu je utvrđeno da je smektitna faza dominantna. Nakon aktivacije kod oba aktivirana uzorka uočen je gubitak karakteristične refleksije kalcita usled rastvaranja u kiseloj sredini. Hemijska analiza je pokazala da je veći stepen dealuminacije i dekatjonizacije postignut kod uzorka aktiviranog na konvencionalan način, što je potvrđeno i difraktogramima praha uzoraka. Rezultati sorpcione analize su pokazali da aktivirani uzorci sadrže pore tipa prskotina i da imaju bolje razvijenu poroznost u oblasti mikro i mezopora od prirodnog bentonita. Kod uzorka aktiviranog u mikrotalasnom polju došlo je do razvoja mezoporozne strukture i rasta specifične površine, a da je pri tome očuvana smektitna struktura u većoj meri nego kod uzorka sintetisanog na konvencionalan način.",
publisher = "Savez inženjera i tehničara Srbije",
journal = "Tehnika",
title = "Properties of adsorbent obtained by conventional and under microwave irradiation, Svojstva adsorbensa dobijenog aktivacijom bentonita na konvencionalan način i u mikrotalasnom polju",
volume = "67",
number = "1",
pages = "17-21",
url = "https://hdl.handle.net/21.15107/rcub_cer_1074"
}

Rožić, L., Novaković, T., Petrović, S., Vuković, Z.,& Stanisavljev, D.. (2012). Properties of adsorbent obtained by conventional and under microwave irradiation. in Tehnika
Savez inženjera i tehničara Srbije., 67(1), 17-21.
https://hdl.handle.net/21.15107/rcub_cer_1074

Rožić L, Novaković T, Petrović S, Vuković Z, Stanisavljev D. Properties of adsorbent obtained by conventional and under microwave irradiation. in Tehnika. 2012;67(1):17-21.
https://hdl.handle.net/21.15107/rcub_cer_1074 .

Rožić, Ljiljana, Novaković, Tatjana, Petrović, Srđan, Vuković, Zorica, Stanisavljev, Dragomir, "Properties of adsorbent obtained by conventional and under microwave irradiation" in Tehnika, 67, no. 1 (2012):17-21,
https://hdl.handle.net/21.15107/rcub_cer_1074 .

TY  - JOUR
AU  - Mojović, Zorica
AU  - Rožić, Ljiljana
AU  - Novaković, Tatjana
AU  - Vuković, Zorica
AU  - Petrović, Srđan
AU  - Randjelović, Danijela
AU  - Mitrić, Miodrag
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1013
AB  - Electrochemical behavior of 12-tungstophosphoric acid (HPW)/acid-activated bentonite (AAB) powders with various loadings of HPW was investigated. The physicochemical properties of the prepared powders were examined by X-ray powder diffraction, nitrogen adsorption-desorption isotherms, atomic force microscopy and cyclic voltammetry measurements. The results indicated that the prepared powders are composed mainly of oriented domains of large rock blocks, probably resulting from a preferable deposition of bentonite particles having a face-to-face interaction. The particles had a mainly disordered mesoporous structure with a pore volume that varied according to the pore size in the range of 2-50 nm. In addition, the particles had crystallite size between 4.9 and 9.0 nm. The electrocatalytic activities of prepared HPW/AAB electrodes were studied in the oxidation of NO2 and the results revealed that the electrodes possessed relatively higher nitrite oxidation currents than AAB electrode. The best electroactivity was observed for HPW3/AAB electrode (AAB + + 20 wt. % HPW) and the limit of detection (3σ) was determined as 8 μM.
AB  - U ovom radu je analizirano elektrohemijsko ponašanje prahova kiselo-aktiviranog bentonita (AAB) modifikovanogsa 5, 10 i 20 mas.% 12-volframfosforne kiseline (HPW). Fizičkohemijske osobine pripremljenih prahova su određivane na osnovu analize snimljenih difraktograma praha, adsorpciono-desoprcionih izotermi azota, skenirajuće atomske mikroskopije (atomic force microscopy - AFM) i ciklovoltamograma. Rezultati AFM-a su pokazali da se prahovi uglavnom sastoje od orijentisanih domena velikih blokova, što je verovatno posledica povoljnije orijentacije čestica bentonita koje imaju bočnu interakciju. Takođe, je ustanovljeno da čestice modifikovanih uzoraka uglavnom imaju neuređenu mezoporoznu strukturu dok zapremina pora varira u skladu sa veličinom pora. Na osnovu difraktograma praha sintetisanih uzoraka izračunate su veličine kristalita i njihove vrednosti se nalaze između 4,9 i 9,0 nm. Elektrokatalitička aktivnost pripremljenih HPW/AAB elektroda je ispitana u reakciji oksidacije NO2 i rezultati su pokazali da ove electrode pokazuju veće struje oksidacije nitritnih jona nego AAB elektroda. Najbolja elektroaktivnost je uočena za HPW3/AAB elektrodu (AAB+20 mas.% HPW). Određeni limit detekcije (3σ) je iznosio 8 μM.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Electrochemical behavior of H3PW12O40/acid-activated bentonite powders
T1  - Elektorhemijsko ponašanje praha kiselo-aktiviranog bentonita modifikovanog H3PW12O40 kiselinom
VL  - 18
IS  - 2
SP  - 329
EP  - 338
DO  - 10.2298/CICEQ110907009M
ER  - 

@article{
author = "Mojović, Zorica and Rožić, Ljiljana and Novaković, Tatjana and Vuković, Zorica and Petrović, Srđan and Randjelović, Danijela and Mitrić, Miodrag",
year = "2012",
abstract = "Electrochemical behavior of 12-tungstophosphoric acid (HPW)/acid-activated bentonite (AAB) powders with various loadings of HPW was investigated. The physicochemical properties of the prepared powders were examined by X-ray powder diffraction, nitrogen adsorption-desorption isotherms, atomic force microscopy and cyclic voltammetry measurements. The results indicated that the prepared powders are composed mainly of oriented domains of large rock blocks, probably resulting from a preferable deposition of bentonite particles having a face-to-face interaction. The particles had a mainly disordered mesoporous structure with a pore volume that varied according to the pore size in the range of 2-50 nm. In addition, the particles had crystallite size between 4.9 and 9.0 nm. The electrocatalytic activities of prepared HPW/AAB electrodes were studied in the oxidation of NO2 and the results revealed that the electrodes possessed relatively higher nitrite oxidation currents than AAB electrode. The best electroactivity was observed for HPW3/AAB electrode (AAB + + 20 wt. % HPW) and the limit of detection (3σ) was determined as 8 μM., U ovom radu je analizirano elektrohemijsko ponašanje prahova kiselo-aktiviranog bentonita (AAB) modifikovanogsa 5, 10 i 20 mas.% 12-volframfosforne kiseline (HPW). Fizičkohemijske osobine pripremljenih prahova su određivane na osnovu analize snimljenih difraktograma praha, adsorpciono-desoprcionih izotermi azota, skenirajuće atomske mikroskopije (atomic force microscopy - AFM) i ciklovoltamograma. Rezultati AFM-a su pokazali da se prahovi uglavnom sastoje od orijentisanih domena velikih blokova, što je verovatno posledica povoljnije orijentacije čestica bentonita koje imaju bočnu interakciju. Takođe, je ustanovljeno da čestice modifikovanih uzoraka uglavnom imaju neuređenu mezoporoznu strukturu dok zapremina pora varira u skladu sa veličinom pora. Na osnovu difraktograma praha sintetisanih uzoraka izračunate su veličine kristalita i njihove vrednosti se nalaze između 4,9 i 9,0 nm. Elektrokatalitička aktivnost pripremljenih HPW/AAB elektroda je ispitana u reakciji oksidacije NO2 i rezultati su pokazali da ove electrode pokazuju veće struje oksidacije nitritnih jona nego AAB elektroda. Najbolja elektroaktivnost je uočena za HPW3/AAB elektrodu (AAB+20 mas.% HPW). Određeni limit detekcije (3σ) je iznosio 8 μM.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Electrochemical behavior of H3PW12O40/acid-activated bentonite powders, Elektorhemijsko ponašanje praha kiselo-aktiviranog bentonita modifikovanog H3PW12O40 kiselinom",
volume = "18",
number = "2",
pages = "329-338",
doi = "10.2298/CICEQ110907009M"
}

Mojović, Z., Rožić, L., Novaković, T., Vuković, Z., Petrović, S., Randjelović, D.,& Mitrić, M.. (2012). Electrochemical behavior of H3PW12O40/acid-activated bentonite powders. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Association of the Chemical Engineers of Serbia., 18(2), 329-338.
https://doi.org/10.2298/CICEQ110907009M

Mojović Z, Rožić L, Novaković T, Vuković Z, Petrović S, Randjelović D, Mitrić M. Electrochemical behavior of H3PW12O40/acid-activated bentonite powders. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2012;18(2):329-338.
doi:10.2298/CICEQ110907009M .

Mojović, Zorica, Rožić, Ljiljana, Novaković, Tatjana, Vuković, Zorica, Petrović, Srđan, Randjelović, Danijela, Mitrić, Miodrag, "Electrochemical behavior of H3PW12O40/acid-activated bentonite powders" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 18, no. 2 (2012):329-338,
https://doi.org/10.2298/CICEQ110907009M . .

TY  - JOUR
AU  - Rožić, Ljiljana
AU  - Petrović, Srđan
AU  - Vuković, Zorica
AU  - Novaković, Tatjana
AU  - Stanisavljev, Dragomir
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/834
AB  - In this study, the statistical design of the experimental method was applied on the process of acid activation of bentonite with microwave irradiation. The influence of activation parameters (time, acid normality and microwave heating power) on the selected process response of the activated bentonite samples was studied. The specific surface area was chosen for the process response, because the chemical, surface and structural properties of the activated clay determine and limit its potential applications. The relationship of various process parameters with the specific surface area of bentonite was examined. A mathematical model was developed using a second-order response surface model (RSM) with a central composite design incorporating the above mentioned process parameters. The developed mathematical model helped to predict the variation in specific surface area of activated bentonite with time (5-21 min), acid normality (2-7 N) and microwave heating power (63?172 W). The calculated regression models were found to be statistically significant at the required range and presented little variability. Furthermore, high values of R2 (0.957) and R2 (adjusted) (0.914) indicate a high dependence and correlation between the observed and the predicted values of the response. These high values also indicate that about 96% of the result of the total variation can be explained by this model. In addition, the model shows that increasing the time and acid normality improves the textural properties of bentonites, resulting in increased specific surface area. This model also can be useful for setting an optimum value of the activation parameters for achieving the maximum specific surface area. An optimum specific surface area of 142 m2g-1 was achieved with an acid normality of 5.2 N, activation time of 7.38 min and microwave power of 117 W. Acid activation of bentonite was found to occur faster with microwave irradiation than with conventional heating. Microwave-assisted processes have the potential to develop into a cost efficient route for acid activation of bentonite.
AB  - Radi dobijanja efikasnog adsorbensa štetnih i opasnih materija izvršena je optimizacija parametara procesa sinteze kiselinski aktiviranog bentonita u mikrotalasnom polju na bazi statističkih planova eksperimenta. Tokom planiranja eksperimenata razmatran je uticaj snage mikrotalasnog polja, vremena aktivacije i koncentracije kiseline na poroznu strukturu aktiviranog materijala. Utvrđeno je da specifična površina zavisno od uslova procesa, ima minimalnu vrednost od 114,0 m2 g-1 za adsorbens sintetisan pri uslovima definisanim u eksperimentu 11 (4,5 N HCl, 21 min i 117 W), a maksimalnu vrednost od 153,5 m2 g-1 za adsorbens dobijen u eksperimentu 8 (3 N HCl, 17 min i 85 W). Ustanovljeno je da tokom procesa kiselinske aktivacije bentonita u mikrotalasnom polju najveći uticaj na formiranje specifične površine ima faktor vreme. Rezultati optimizacije procesa zasnovane na funkciji poželjnosti uz uslov minimalnog vremena aktivacije, vrednosti koncentracije kiseline i snage mikrotalasnog zračenja u zadatom opsegu, pokazali su da je optimalno vreme aktivacije bentonita u mikrotalasnom polju 7,38 min dok kod hidrotermalne aktivacije sa kiselinom iste koncentracije potrebno vreme iznosi 2,8 h.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Response surface optimisation for activation of bentonite with microwave irradiation
T1  - Optimalno faktorno planiranje procesa kiselinske aktivacije bentonita u mikrotalasnom polju
VL  - 65
IS  - 5
SP  - 489
EP  - 495
DO  - 10.2298/HEMIND110420043R
ER  - 

@article{
author = "Rožić, Ljiljana and Petrović, Srđan and Vuković, Zorica and Novaković, Tatjana and Stanisavljev, Dragomir",
year = "2011",
abstract = "In this study, the statistical design of the experimental method was applied on the process of acid activation of bentonite with microwave irradiation. The influence of activation parameters (time, acid normality and microwave heating power) on the selected process response of the activated bentonite samples was studied. The specific surface area was chosen for the process response, because the chemical, surface and structural properties of the activated clay determine and limit its potential applications. The relationship of various process parameters with the specific surface area of bentonite was examined. A mathematical model was developed using a second-order response surface model (RSM) with a central composite design incorporating the above mentioned process parameters. The developed mathematical model helped to predict the variation in specific surface area of activated bentonite with time (5-21 min), acid normality (2-7 N) and microwave heating power (63?172 W). The calculated regression models were found to be statistically significant at the required range and presented little variability. Furthermore, high values of R2 (0.957) and R2 (adjusted) (0.914) indicate a high dependence and correlation between the observed and the predicted values of the response. These high values also indicate that about 96% of the result of the total variation can be explained by this model. In addition, the model shows that increasing the time and acid normality improves the textural properties of bentonites, resulting in increased specific surface area. This model also can be useful for setting an optimum value of the activation parameters for achieving the maximum specific surface area. An optimum specific surface area of 142 m2g-1 was achieved with an acid normality of 5.2 N, activation time of 7.38 min and microwave power of 117 W. Acid activation of bentonite was found to occur faster with microwave irradiation than with conventional heating. Microwave-assisted processes have the potential to develop into a cost efficient route for acid activation of bentonite., Radi dobijanja efikasnog adsorbensa štetnih i opasnih materija izvršena je optimizacija parametara procesa sinteze kiselinski aktiviranog bentonita u mikrotalasnom polju na bazi statističkih planova eksperimenta. Tokom planiranja eksperimenata razmatran je uticaj snage mikrotalasnog polja, vremena aktivacije i koncentracije kiseline na poroznu strukturu aktiviranog materijala. Utvrđeno je da specifična površina zavisno od uslova procesa, ima minimalnu vrednost od 114,0 m2 g-1 za adsorbens sintetisan pri uslovima definisanim u eksperimentu 11 (4,5 N HCl, 21 min i 117 W), a maksimalnu vrednost od 153,5 m2 g-1 za adsorbens dobijen u eksperimentu 8 (3 N HCl, 17 min i 85 W). Ustanovljeno je da tokom procesa kiselinske aktivacije bentonita u mikrotalasnom polju najveći uticaj na formiranje specifične površine ima faktor vreme. Rezultati optimizacije procesa zasnovane na funkciji poželjnosti uz uslov minimalnog vremena aktivacije, vrednosti koncentracije kiseline i snage mikrotalasnog zračenja u zadatom opsegu, pokazali su da je optimalno vreme aktivacije bentonita u mikrotalasnom polju 7,38 min dok kod hidrotermalne aktivacije sa kiselinom iste koncentracije potrebno vreme iznosi 2,8 h.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Response surface optimisation for activation of bentonite with microwave irradiation, Optimalno faktorno planiranje procesa kiselinske aktivacije bentonita u mikrotalasnom polju",
volume = "65",
number = "5",
pages = "489-495",
doi = "10.2298/HEMIND110420043R"
}

Rožić, L., Petrović, S., Vuković, Z., Novaković, T.,& Stanisavljev, D.. (2011). Response surface optimisation for activation of bentonite with microwave irradiation. in Hemijska industrija
Association of Chemical Engineers of Serbia., 65(5), 489-495.
https://doi.org/10.2298/HEMIND110420043R

Rožić L, Petrović S, Vuković Z, Novaković T, Stanisavljev D. Response surface optimisation for activation of bentonite with microwave irradiation. in Hemijska industrija. 2011;65(5):489-495.
doi:10.2298/HEMIND110420043R .

Rožić, Ljiljana, Petrović, Srđan, Vuković, Zorica, Novaković, Tatjana, Stanisavljev, Dragomir, "Response surface optimisation for activation of bentonite with microwave irradiation" in Hemijska industrija, 65, no. 5 (2011):489-495,
https://doi.org/10.2298/HEMIND110420043R . .

TY  - JOUR
AU  - Rožić, Ljiljana
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Petrović, Srđan
AU  - Novaković, Tatjana
AU  - Vuković, Zorica
AU  - Nedić, Zoran
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/772
AB  - In the present study, the effect of 12-tungstophosphoric acid (HPW) immobilisation on the catalytic activity of H(3)PW(12)O(40)/mesoporous acid-activated bentonite catalysts (AAB) was investigated. The catalysts were characterised by XRD, IR, SEM and BET, and the activity of acid-activated bentonite catalysts with various loadings of HPW were studied in the conversion of vapour-phase 2-propanol. The results indicated that the conversion of 2-propanol increased substantially as the temperature increased from 343 K to 553 K. Alternatively, the conversion and selectivity of the reaction increased with an increase in the HPW concentration. Moreover, the proposed catalysts enhanced the oxidation of 2-propanol to acetone and suppressed the acid-catalysed dehydration of propanol to propylene.
PB  - Elsevier
T2  - Applied Clay Science
T1  - Mesoporous 12-tungstophosphoric acid/activated bentonite catalysts for oxidation of 2-propanol
VL  - 53
IS  - 2
SP  - 151
EP  - 156
DO  - 10.1016/j.clay.2010.09.017
ER  - 

@article{
author = "Rožić, Ljiljana and Grbić, Boško and Radić, Nenad and Petrović, Srđan and Novaković, Tatjana and Vuković, Zorica and Nedić, Zoran",
year = "2011",
abstract = "In the present study, the effect of 12-tungstophosphoric acid (HPW) immobilisation on the catalytic activity of H(3)PW(12)O(40)/mesoporous acid-activated bentonite catalysts (AAB) was investigated. The catalysts were characterised by XRD, IR, SEM and BET, and the activity of acid-activated bentonite catalysts with various loadings of HPW were studied in the conversion of vapour-phase 2-propanol. The results indicated that the conversion of 2-propanol increased substantially as the temperature increased from 343 K to 553 K. Alternatively, the conversion and selectivity of the reaction increased with an increase in the HPW concentration. Moreover, the proposed catalysts enhanced the oxidation of 2-propanol to acetone and suppressed the acid-catalysed dehydration of propanol to propylene.",
publisher = "Elsevier",
journal = "Applied Clay Science",
title = "Mesoporous 12-tungstophosphoric acid/activated bentonite catalysts for oxidation of 2-propanol",
volume = "53",
number = "2",
pages = "151-156",
doi = "10.1016/j.clay.2010.09.017"
}

Rožić, L., Grbić, B., Radić, N., Petrović, S., Novaković, T., Vuković, Z.,& Nedić, Z.. (2011). Mesoporous 12-tungstophosphoric acid/activated bentonite catalysts for oxidation of 2-propanol. in Applied Clay Science
Elsevier., 53(2), 151-156.
https://doi.org/10.1016/j.clay.2010.09.017

Rožić L, Grbić B, Radić N, Petrović S, Novaković T, Vuković Z, Nedić Z. Mesoporous 12-tungstophosphoric acid/activated bentonite catalysts for oxidation of 2-propanol. in Applied Clay Science. 2011;53(2):151-156.
doi:10.1016/j.clay.2010.09.017 .

Rožić, Ljiljana, Grbić, Boško, Radić, Nenad, Petrović, Srđan, Novaković, Tatjana, Vuković, Zorica, Nedić, Zoran, "Mesoporous 12-tungstophosphoric acid/activated bentonite catalysts for oxidation of 2-propanol" in Applied Clay Science, 53, no. 2 (2011):151-156,
https://doi.org/10.1016/j.clay.2010.09.017 . .

TY  - JOUR
AU  - Radić, Nenad
AU  - Grbić, Boško
AU  - Rožić, Ljiljana
AU  - Novaković, Tatjana
AU  - Petrović, Srđan
AU  - Stoychev, Dimitar
AU  - Stefanov, Plamen
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/846
AB  - Alumina coatings were obtained by deposition of boehmite sol, with added polyvinyl alcohol or polyethylene glycol, on stainless steel foil by spray pyrolysis method. Characterizations of coatings were performed by SEM, XRD, XPS, AFM and S(BET) analysis. Alumina coating prepared with polyethylene glycol has improved resistance to surface area loss than coating obtained with polyvinyl alcohol. At elevated temperatures polyethylene glycol has preserved the morphology of alumina coating and prevents the diffusion of Fe from stainless steel substrate. Porous, foam-like aluminium oxide coating, consisted of accidentally distributed rings of alumina, was created from both additives. Such coating morphology, with a hierarchical porosity, has application in numerous catalytic processes.
PB  - Elsevier
T2  - Journal of Non-Crystalline Solids
T1  - Effects of organic additives on alumina coatings on stainless steel obtained by spray pyrolysis
VL  - 357
IS  - 21
SP  - 3592
EP  - 3597
DO  - 10.1016/j.jnoncrysol.2011.07.006
ER  - 

@article{
author = "Radić, Nenad and Grbić, Boško and Rožić, Ljiljana and Novaković, Tatjana and Petrović, Srđan and Stoychev, Dimitar and Stefanov, Plamen",
year = "2011",
abstract = "Alumina coatings were obtained by deposition of boehmite sol, with added polyvinyl alcohol or polyethylene glycol, on stainless steel foil by spray pyrolysis method. Characterizations of coatings were performed by SEM, XRD, XPS, AFM and S(BET) analysis. Alumina coating prepared with polyethylene glycol has improved resistance to surface area loss than coating obtained with polyvinyl alcohol. At elevated temperatures polyethylene glycol has preserved the morphology of alumina coating and prevents the diffusion of Fe from stainless steel substrate. Porous, foam-like aluminium oxide coating, consisted of accidentally distributed rings of alumina, was created from both additives. Such coating morphology, with a hierarchical porosity, has application in numerous catalytic processes.",
publisher = "Elsevier",
journal = "Journal of Non-Crystalline Solids",
title = "Effects of organic additives on alumina coatings on stainless steel obtained by spray pyrolysis",
volume = "357",
number = "21",
pages = "3592-3597",
doi = "10.1016/j.jnoncrysol.2011.07.006"
}

Radić, N., Grbić, B., Rožić, L., Novaković, T., Petrović, S., Stoychev, D.,& Stefanov, P.. (2011). Effects of organic additives on alumina coatings on stainless steel obtained by spray pyrolysis. in Journal of Non-Crystalline Solids
Elsevier., 357(21), 3592-3597.
https://doi.org/10.1016/j.jnoncrysol.2011.07.006

Radić N, Grbić B, Rožić L, Novaković T, Petrović S, Stoychev D, Stefanov P. Effects of organic additives on alumina coatings on stainless steel obtained by spray pyrolysis. in Journal of Non-Crystalline Solids. 2011;357(21):3592-3597.
doi:10.1016/j.jnoncrysol.2011.07.006 .

Radić, Nenad, Grbić, Boško, Rožić, Ljiljana, Novaković, Tatjana, Petrović, Srđan, Stoychev, Dimitar, Stefanov, Plamen, "Effects of organic additives on alumina coatings on stainless steel obtained by spray pyrolysis" in Journal of Non-Crystalline Solids, 357, no. 21 (2011):3592-3597,
https://doi.org/10.1016/j.jnoncrysol.2011.07.006 . .

TY  - JOUR
AU  - Novaković, Tatjana
AU  - Rožić, Ljiljana
AU  - Vuković, Zorica
AU  - Petrović, Srđan
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/894
AB  - Sintering and crystallization of low-density polyethylene glycol (PEG) and lanthanum, La(III)-doped Al2O3 aerogels prepared from aluminum isopropoxide were investigated. The sintering behavior of non-doped and doped aerogels was examined by following the change of specific surface area with isothermal heat-treatment. The specific surface area and crystalline phases of non-doped and PEG+ +La(III)-doped aerogels were determined, and the effects of dopants on the sintering and crystallization of Al2O3 aerogels are discussed. Isothermal sintering experiments showed that the sintering mechanism of non-doped and PEG+La(III)-doped Al2O3 aerogels is surface diffusion. The specific surface areas of alumina samples decrease rapidly during the initial period of sintering, and more slowly with prolonged sintering time. The change of the porous structure is correlated with the phase transformation of γ-Al2O3 during calcinations of Al2O3 aerogels. The surface area of non-doped Al2O3 aerogels came to about 20 m2 g-1 with heat-treatment at 1100°C because of crystallization of α-Al2O3 after densification. In the case of heat-treatment at 1200°C, the largest surface area was observed for PEG+La(III) doped Al2O3 aerogels and the XRD pattern showed only low ordered θ-Al2O3. These indicate that the addition of PEG+La(III) to boehmite sol prevents Al2O3 aerogels from sintering and crystallizing to the α-Al2O3 phase. Even after 20 h at 1000°C, PEG+La (III)-doped alumina samples maintain a rather good specific surface area (108 m2 g-1) in comparison to the non-doped, containing mainly θ-Al2O3 and minor amounts of δ-Al2O3. Aluminum-oxides with these structural and textural properties are widely used as coatings and catalyst supports in various fields of catalysis.
AB  - U ovom radu je ispitivan uticaj dodataka polietilen-glikola i lantana na mehanizam sinterovanja i termostabilnost aktivnog poroznog aluminijum-oksida dobijenog sol-gel metodom. Rezultati su pokazali da se proces izotermskog sinterovanja odvija mehanizmom površinske difuzije materijala i da sa dodatkom polietilen-glikola i lantana ne dolazi do promene mehanizma procesa sinterovanja. Zapaženo je da specifična površina aluminijum-oksida sa dodatkom i bez dodatka polietilen-glikola i lantana na početku procesa sinterovanja brzo opada, dok je tokom vremena taj pad sve sporiji. Promene parametara porozne strukture su korelisane sa faznim transformacijama γ-Al2O3 nastalim u toku procesa sinterovanja. Rendgeno-strukturna analiza je pokazala da uzorak bez dodataka sinterovan na 1000°C sadrži uglavnom θ-Al2O3 fazu, dok se na 1100°C potpuno transformiše u α-Al2O3 fazu. Međutim, kod uzorka aluminijum-oksida sa dodatkom polietilen-glikola i lantana nakon 20 h žarenja na 1000°C primećen je tek začetak θ-Al2O3 faze.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Kinetics of sintering of polyethilene glycol and lanthanum doped aluminum oxide obtained by the sol-gel method
T1  - Uticaj dodatka polietilen-glikola i lantana na mehanizam sinterovanja aluminijum-oksida dobijenog sol-gel postupkom
VL  - 65
IS  - 4
SP  - 355
EP  - 362
DO  - 10.2298/HEMIND110406031N
ER  - 

@article{
author = "Novaković, Tatjana and Rožić, Ljiljana and Vuković, Zorica and Petrović, Srđan",
year = "2011",
abstract = "Sintering and crystallization of low-density polyethylene glycol (PEG) and lanthanum, La(III)-doped Al2O3 aerogels prepared from aluminum isopropoxide were investigated. The sintering behavior of non-doped and doped aerogels was examined by following the change of specific surface area with isothermal heat-treatment. The specific surface area and crystalline phases of non-doped and PEG+ +La(III)-doped aerogels were determined, and the effects of dopants on the sintering and crystallization of Al2O3 aerogels are discussed. Isothermal sintering experiments showed that the sintering mechanism of non-doped and PEG+La(III)-doped Al2O3 aerogels is surface diffusion. The specific surface areas of alumina samples decrease rapidly during the initial period of sintering, and more slowly with prolonged sintering time. The change of the porous structure is correlated with the phase transformation of γ-Al2O3 during calcinations of Al2O3 aerogels. The surface area of non-doped Al2O3 aerogels came to about 20 m2 g-1 with heat-treatment at 1100°C because of crystallization of α-Al2O3 after densification. In the case of heat-treatment at 1200°C, the largest surface area was observed for PEG+La(III) doped Al2O3 aerogels and the XRD pattern showed only low ordered θ-Al2O3. These indicate that the addition of PEG+La(III) to boehmite sol prevents Al2O3 aerogels from sintering and crystallizing to the α-Al2O3 phase. Even after 20 h at 1000°C, PEG+La (III)-doped alumina samples maintain a rather good specific surface area (108 m2 g-1) in comparison to the non-doped, containing mainly θ-Al2O3 and minor amounts of δ-Al2O3. Aluminum-oxides with these structural and textural properties are widely used as coatings and catalyst supports in various fields of catalysis., U ovom radu je ispitivan uticaj dodataka polietilen-glikola i lantana na mehanizam sinterovanja i termostabilnost aktivnog poroznog aluminijum-oksida dobijenog sol-gel metodom. Rezultati su pokazali da se proces izotermskog sinterovanja odvija mehanizmom površinske difuzije materijala i da sa dodatkom polietilen-glikola i lantana ne dolazi do promene mehanizma procesa sinterovanja. Zapaženo je da specifična površina aluminijum-oksida sa dodatkom i bez dodatka polietilen-glikola i lantana na početku procesa sinterovanja brzo opada, dok je tokom vremena taj pad sve sporiji. Promene parametara porozne strukture su korelisane sa faznim transformacijama γ-Al2O3 nastalim u toku procesa sinterovanja. Rendgeno-strukturna analiza je pokazala da uzorak bez dodataka sinterovan na 1000°C sadrži uglavnom θ-Al2O3 fazu, dok se na 1100°C potpuno transformiše u α-Al2O3 fazu. Međutim, kod uzorka aluminijum-oksida sa dodatkom polietilen-glikola i lantana nakon 20 h žarenja na 1000°C primećen je tek začetak θ-Al2O3 faze.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Kinetics of sintering of polyethilene glycol and lanthanum doped aluminum oxide obtained by the sol-gel method, Uticaj dodatka polietilen-glikola i lantana na mehanizam sinterovanja aluminijum-oksida dobijenog sol-gel postupkom",
volume = "65",
number = "4",
pages = "355-362",
doi = "10.2298/HEMIND110406031N"
}

Novaković, T., Rožić, L., Vuković, Z.,& Petrović, S.. (2011). Kinetics of sintering of polyethilene glycol and lanthanum doped aluminum oxide obtained by the sol-gel method. in Hemijska industrija
Association of Chemical Engineers of Serbia., 65(4), 355-362.
https://doi.org/10.2298/HEMIND110406031N

Novaković T, Rožić L, Vuković Z, Petrović S. Kinetics of sintering of polyethilene glycol and lanthanum doped aluminum oxide obtained by the sol-gel method. in Hemijska industrija. 2011;65(4):355-362.
doi:10.2298/HEMIND110406031N .

Novaković, Tatjana, Rožić, Ljiljana, Vuković, Zorica, Petrović, Srđan, "Kinetics of sintering of polyethilene glycol and lanthanum doped aluminum oxide obtained by the sol-gel method" in Hemijska industrija, 65, no. 4 (2011):355-362,
https://doi.org/10.2298/HEMIND110406031N . .

TY  - JOUR
AU  - Petrović, Srđan
AU  - Vuković, Zorica
AU  - Novaković, Tatjana
AU  - Nedić, Zoran P.
AU  - Rožić, Ljiljana
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/770
AB  - Experimental adsorption isotherms were used to evaluate the specific surface area and the surface fractal dimensions of acid-activated bentonite samples modified with a heteropoly acid (HPW). The aim of the investigations was to search for correlations between the specific surface area and the geometric heterogeneity, as characterized by the surface fractal dimension and the content of added acid. In addition, mercury intrusion was employed to evaluate the porous microstructures of these materials. The results from the Frankel-Halsey-Hill method showed that, in the p/p0 region from 0.75 to 0.96, surface fractal dimension increased with increasing content of heteropoly acid. The results from mercury intrusion porosimetry (MIP) data showed the generation of mesoporous structures with important topographical modifications, indicating an increase in the roughness (fractal geometry) of the surface of the solids as a consequence of the modification with the heteropoly acid. By comparison, MIP is preferable for the characterization because of its wide effective probing range.
AB  - Specifična površina i fraktalna dimenzija površine uzaraka kiselinski aktiviranog bentonita modifikovanog heteropoli kiselinom (HPW) izračunate su na osnovu podataka iz adsorpcionih izotermi azota. Cilj ovog istraživanja bio je da se nađe korelacija između specifične površine i geometrijske heterogenosti, kao i zavisnost fraktalne dimenzije površine od sadržaja dodate heteropoli kiseline. Takođe, metoda živine porozimetrije je korišćena za ispitivanje porozne mikrostrukture sintetisanih uzoraka. Rezultati Frankel-Halsey-Hill metode, primenjene u oblasti relativnog pritiska od 0,75 do 0,96, pokazuju da fraktalna dimenzija površine raste sa porastom sadržaja heteropoli kiseline. Rezultati živine porozimetrije su pokazali da je došlo do značajnih topografskih promena (porast hrapavosti) i razvoja mezoporozne strukture uzoraka, kao posledica modifikacije heteropoli kiselinom. Poređenje je pokazalo da je metoda živine porozimetrije primenljiva u širem opsegu prečnika pora.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Fractal analysis of bentonite modified with heteropoly acid using nitrogen sorption and mercury intrusion porosimetry
T1  - Fraktalna analiza bentonita modifikovanog heteropoli kiselinom korišćenjem podataka sorpcione analize i živine porozimetrije
VL  - 76
IS  - 10
SP  - 1403
EP  - 1410
DO  - 10.2298/JSC101027126P
ER  - 

@article{
author = "Petrović, Srđan and Vuković, Zorica and Novaković, Tatjana and Nedić, Zoran P. and Rožić, Ljiljana",
year = "2011",
abstract = "Experimental adsorption isotherms were used to evaluate the specific surface area and the surface fractal dimensions of acid-activated bentonite samples modified with a heteropoly acid (HPW). The aim of the investigations was to search for correlations between the specific surface area and the geometric heterogeneity, as characterized by the surface fractal dimension and the content of added acid. In addition, mercury intrusion was employed to evaluate the porous microstructures of these materials. The results from the Frankel-Halsey-Hill method showed that, in the p/p0 region from 0.75 to 0.96, surface fractal dimension increased with increasing content of heteropoly acid. The results from mercury intrusion porosimetry (MIP) data showed the generation of mesoporous structures with important topographical modifications, indicating an increase in the roughness (fractal geometry) of the surface of the solids as a consequence of the modification with the heteropoly acid. By comparison, MIP is preferable for the characterization because of its wide effective probing range., Specifična površina i fraktalna dimenzija površine uzaraka kiselinski aktiviranog bentonita modifikovanog heteropoli kiselinom (HPW) izračunate su na osnovu podataka iz adsorpcionih izotermi azota. Cilj ovog istraživanja bio je da se nađe korelacija između specifične površine i geometrijske heterogenosti, kao i zavisnost fraktalne dimenzije površine od sadržaja dodate heteropoli kiseline. Takođe, metoda živine porozimetrije je korišćena za ispitivanje porozne mikrostrukture sintetisanih uzoraka. Rezultati Frankel-Halsey-Hill metode, primenjene u oblasti relativnog pritiska od 0,75 do 0,96, pokazuju da fraktalna dimenzija površine raste sa porastom sadržaja heteropoli kiseline. Rezultati živine porozimetrije su pokazali da je došlo do značajnih topografskih promena (porast hrapavosti) i razvoja mezoporozne strukture uzoraka, kao posledica modifikacije heteropoli kiselinom. Poređenje je pokazalo da je metoda živine porozimetrije primenljiva u širem opsegu prečnika pora.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Fractal analysis of bentonite modified with heteropoly acid using nitrogen sorption and mercury intrusion porosimetry, Fraktalna analiza bentonita modifikovanog heteropoli kiselinom korišćenjem podataka sorpcione analize i živine porozimetrije",
volume = "76",
number = "10",
pages = "1403-1410",
doi = "10.2298/JSC101027126P"
}

Petrović, S., Vuković, Z., Novaković, T., Nedić, Z. P.,& Rožić, L.. (2011). Fractal analysis of bentonite modified with heteropoly acid using nitrogen sorption and mercury intrusion porosimetry. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 76(10), 1403-1410.
https://doi.org/10.2298/JSC101027126P

Petrović S, Vuković Z, Novaković T, Nedić ZP, Rožić L. Fractal analysis of bentonite modified with heteropoly acid using nitrogen sorption and mercury intrusion porosimetry. in Journal of the Serbian Chemical Society. 2011;76(10):1403-1410.
doi:10.2298/JSC101027126P .

Petrović, Srđan, Vuković, Zorica, Novaković, Tatjana, Nedić, Zoran P., Rožić, Ljiljana, "Fractal analysis of bentonite modified with heteropoly acid using nitrogen sorption and mercury intrusion porosimetry" in Journal of the Serbian Chemical Society, 76, no. 10 (2011):1403-1410,
https://doi.org/10.2298/JSC101027126P . .