TY  - JOUR
AU  - Milićević, Sonja
AU  - Vlahović, Milica
AU  - Kragović, Milan
AU  - Martinović, Sanja
AU  - Milošević, Vladan
AU  - Jovanović, Ivana
AU  - Stojmenović, Marija
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3762
AB  - The intent in this paper is to define how the batch equilibrium results of copper removal from a synthetic solution on natural zeolite can be used for prediction of the breakthrough curves in the fixed-bed system for both a synthetic solution and wastewater. Natural zeolite from the Vranjska Banja deposit, Serbia, has been fully characterized (XRD, chemical composition, DTA/TG, SEM/EDS) as a clinoptilolite with cation exchange capacity of 146 meq/100 g. The maximum adsorption capacity (qm) in the batch of the mono-component system (synthetic copper solution) obtained using the Langmuir isotherm model was 7.30 and 6.10 mg/g for particle size below 0.043 and 0.6–0.8 mm, respectively. Using the flow-through system with the 0.6–0.8 mm zeolite fixed-bed, almost double the adsorption capacity (11.2–12.2 mg/g) has been achieved in a saturation point for the copper removal from the synthetic solution, compared to the batch. Better results are attributed to the constant high concentration gradient in flow-through systems compared to the batch. The complex composition of wastewater and large amounts of earth alkaline metals disturb free adsorption sights on the zeolite surface. This results in a less effective adsorption in flow-through systems with adsorption capacity in breakthrough point of 5.84 mg/g (~0.95 × qm) and in a saturation point of 7.10 mg/g (~1.15 × qm).
PB  - MDPI
T2  - Minerals
T1  - Removal of Copper from Mining Wastewater Using Natural Raw Material—Comparative Study between the Synthetic and Natural Wastewater Samples
VL  - 10
IS  - 9
SP  - 753
DO  - 10.3390/min10090753
ER  - 

@article{
author = "Milićević, Sonja and Vlahović, Milica and Kragović, Milan and Martinović, Sanja and Milošević, Vladan and Jovanović, Ivana and Stojmenović, Marija",
year = "2020",
abstract = "The intent in this paper is to define how the batch equilibrium results of copper removal from a synthetic solution on natural zeolite can be used for prediction of the breakthrough curves in the fixed-bed system for both a synthetic solution and wastewater. Natural zeolite from the Vranjska Banja deposit, Serbia, has been fully characterized (XRD, chemical composition, DTA/TG, SEM/EDS) as a clinoptilolite with cation exchange capacity of 146 meq/100 g. The maximum adsorption capacity (qm) in the batch of the mono-component system (synthetic copper solution) obtained using the Langmuir isotherm model was 7.30 and 6.10 mg/g for particle size below 0.043 and 0.6–0.8 mm, respectively. Using the flow-through system with the 0.6–0.8 mm zeolite fixed-bed, almost double the adsorption capacity (11.2–12.2 mg/g) has been achieved in a saturation point for the copper removal from the synthetic solution, compared to the batch. Better results are attributed to the constant high concentration gradient in flow-through systems compared to the batch. The complex composition of wastewater and large amounts of earth alkaline metals disturb free adsorption sights on the zeolite surface. This results in a less effective adsorption in flow-through systems with adsorption capacity in breakthrough point of 5.84 mg/g (~0.95 × qm) and in a saturation point of 7.10 mg/g (~1.15 × qm).",
publisher = "MDPI",
journal = "Minerals",
title = "Removal of Copper from Mining Wastewater Using Natural Raw Material—Comparative Study between the Synthetic and Natural Wastewater Samples",
volume = "10",
number = "9",
pages = "753",
doi = "10.3390/min10090753"
}

Milićević, S., Vlahović, M., Kragović, M., Martinović, S., Milošević, V., Jovanović, I.,& Stojmenović, M.. (2020). Removal of Copper from Mining Wastewater Using Natural Raw Material—Comparative Study between the Synthetic and Natural Wastewater Samples. in Minerals
MDPI., 10(9), 753.
https://doi.org/10.3390/min10090753

Milićević S, Vlahović M, Kragović M, Martinović S, Milošević V, Jovanović I, Stojmenović M. Removal of Copper from Mining Wastewater Using Natural Raw Material—Comparative Study between the Synthetic and Natural Wastewater Samples. in Minerals. 2020;10(9):753.
doi:10.3390/min10090753 .

Milićević, Sonja, Vlahović, Milica, Kragović, Milan, Martinović, Sanja, Milošević, Vladan, Jovanović, Ivana, Stojmenović, Marija, "Removal of Copper from Mining Wastewater Using Natural Raw Material—Comparative Study between the Synthetic and Natural Wastewater Samples" in Minerals, 10, no. 9 (2020):753,
https://doi.org/10.3390/min10090753 . .

TY  - CONF
AU  - Milićević, Sonja
AU  - Kragović, Milan
AU  - Milošević, Vladan
AU  - Martinović, Sanja
AU  - Čarapić, Jelena
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5950
AB  - The increasing levels of industrial wastewater that are released to the environment present a serious threat to human health, living resources, and ecological systems. Zeolites tested for removal of Cu+2 from contaminated water in two different systems, batch and fixed-bed. Experiments were performed for wide range of initial concentrations of Cu 50-300 mg dm-3. Under applied experimental conditions, both systems manifest satisfying removal efficiency. Obtained adsorption capacities for the copper removal from the solution with the initial Cu concentration of 300 mg dm-3 were 7.52 and 12.19 mg mg-1 for batched and fixed-bed system, respectively.
PB  - Belgrade, Serbia : University of Belgrade - Faculty of Mining and Geology
C3  - Proceedings - 7th International Symposium Mining and Environmental Protection MEP-19, 25-28 September 2019, Vrdnik, Serbia
T1  - Copper removal capacity by zeolite: Comparation in a batch and fixed-bed system
SP  - 187
EP  - 191
UR  - https://hdl.handle.net/21.15107/rcub_cer_5950
ER  - 

@conference{
author = "Milićević, Sonja and Kragović, Milan and Milošević, Vladan and Martinović, Sanja and Čarapić, Jelena",
year = "2019",
abstract = "The increasing levels of industrial wastewater that are released to the environment present a serious threat to human health, living resources, and ecological systems. Zeolites tested for removal of Cu+2 from contaminated water in two different systems, batch and fixed-bed. Experiments were performed for wide range of initial concentrations of Cu 50-300 mg dm-3. Under applied experimental conditions, both systems manifest satisfying removal efficiency. Obtained adsorption capacities for the copper removal from the solution with the initial Cu concentration of 300 mg dm-3 were 7.52 and 12.19 mg mg-1 for batched and fixed-bed system, respectively.",
publisher = "Belgrade, Serbia : University of Belgrade - Faculty of Mining and Geology",
journal = "Proceedings - 7th International Symposium Mining and Environmental Protection MEP-19, 25-28 September 2019, Vrdnik, Serbia",
title = "Copper removal capacity by zeolite: Comparation in a batch and fixed-bed system",
pages = "187-191",
url = "https://hdl.handle.net/21.15107/rcub_cer_5950"
}

Milićević, S., Kragović, M., Milošević, V., Martinović, S.,& Čarapić, J.. (2019). Copper removal capacity by zeolite: Comparation in a batch and fixed-bed system. in Proceedings - 7th International Symposium Mining and Environmental Protection MEP-19, 25-28 September 2019, Vrdnik, Serbia
Belgrade, Serbia : University of Belgrade - Faculty of Mining and Geology., 187-191.
https://hdl.handle.net/21.15107/rcub_cer_5950

Milićević S, Kragović M, Milošević V, Martinović S, Čarapić J. Copper removal capacity by zeolite: Comparation in a batch and fixed-bed system. in Proceedings - 7th International Symposium Mining and Environmental Protection MEP-19, 25-28 September 2019, Vrdnik, Serbia. 2019;:187-191.
https://hdl.handle.net/21.15107/rcub_cer_5950 .

Milićević, Sonja, Kragović, Milan, Milošević, Vladan, Martinović, Sanja, Čarapić, Jelena, "Copper removal capacity by zeolite: Comparation in a batch and fixed-bed system" in Proceedings - 7th International Symposium Mining and Environmental Protection MEP-19, 25-28 September 2019, Vrdnik, Serbia (2019):187-191,
https://hdl.handle.net/21.15107/rcub_cer_5950 .

TY  - JOUR
AU  - Milićević, Sonja
AU  - Martinović, Sanja
AU  - Milošević, Vladan
AU  - Stojanović, Jovica
AU  - Povrenović, Dragan
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2366
AB  - Systematic modification of three structurally different minerals (zeolite, mica, and vermiculite) was carried out with the aim of determining the modification mechanism and exposing the hydrophobic surface that can be used as a sorbent for many organic compounds. Mechanism of modification with cationic surfactant depends strongly on the mineral type. In order to identify the influence of aluminosilicates structural differences on the modification process, adsorption experiments with organic matter and water vapor, supplemented with the DTA/TG analysis, were performed. The cation exchange capacity (CEC) value was 1454>560>28meqkg(-1) for zeolite (clinoptilolite), vermiculite, and mica (muscovite), respectively. Despite its CEC value, vermiculite adsorbed three times the amount of organic matter than did clinoptilolite due to the porous structure of zeolite, which acted to limit the adsorption only on the external exchangeable cations. If the loading amount is equal to the CEC or the external cation exchange capacity for clinoptilolite (ECEC approximate to 10% CEC), the monolayer will form while mineral surface will have hydrophobic character. Only one active center exists at the surface of the clinoptilolite that was identified by DTA curves with a sharp and defined peak around 300 degrees C and by the mass loss at the TG diagrams. Two significant and equal active centers were observed in vermiculite, one for the exchange of the surface cations and the other for the interlayer cations and H2O molecules. Muscovite CEC is negligible, and due to the absence of any other functional groups, the modification of this mineral was impossible.
PB  - Springer
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Differences in coating mechanism of structurally different aluminosilicates observed through the thermal analysis
VL  - 134
IS  - 2
SP  - 1011
EP  - 1019
DO  - 10.1007/s10973-018-7351-3
ER  - 

@article{
author = "Milićević, Sonja and Martinović, Sanja and Milošević, Vladan and Stojanović, Jovica and Povrenović, Dragan",
year = "2018",
abstract = "Systematic modification of three structurally different minerals (zeolite, mica, and vermiculite) was carried out with the aim of determining the modification mechanism and exposing the hydrophobic surface that can be used as a sorbent for many organic compounds. Mechanism of modification with cationic surfactant depends strongly on the mineral type. In order to identify the influence of aluminosilicates structural differences on the modification process, adsorption experiments with organic matter and water vapor, supplemented with the DTA/TG analysis, were performed. The cation exchange capacity (CEC) value was 1454>560>28meqkg(-1) for zeolite (clinoptilolite), vermiculite, and mica (muscovite), respectively. Despite its CEC value, vermiculite adsorbed three times the amount of organic matter than did clinoptilolite due to the porous structure of zeolite, which acted to limit the adsorption only on the external exchangeable cations. If the loading amount is equal to the CEC or the external cation exchange capacity for clinoptilolite (ECEC approximate to 10% CEC), the monolayer will form while mineral surface will have hydrophobic character. Only one active center exists at the surface of the clinoptilolite that was identified by DTA curves with a sharp and defined peak around 300 degrees C and by the mass loss at the TG diagrams. Two significant and equal active centers were observed in vermiculite, one for the exchange of the surface cations and the other for the interlayer cations and H2O molecules. Muscovite CEC is negligible, and due to the absence of any other functional groups, the modification of this mineral was impossible.",
publisher = "Springer",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Differences in coating mechanism of structurally different aluminosilicates observed through the thermal analysis",
volume = "134",
number = "2",
pages = "1011-1019",
doi = "10.1007/s10973-018-7351-3"
}

Milićević, S., Martinović, S., Milošević, V., Stojanović, J.,& Povrenović, D.. (2018). Differences in coating mechanism of structurally different aluminosilicates observed through the thermal analysis. in Journal of Thermal Analysis and Calorimetry
Springer., 134(2), 1011-1019.
https://doi.org/10.1007/s10973-018-7351-3

Milićević S, Martinović S, Milošević V, Stojanović J, Povrenović D. Differences in coating mechanism of structurally different aluminosilicates observed through the thermal analysis. in Journal of Thermal Analysis and Calorimetry. 2018;134(2):1011-1019.
doi:10.1007/s10973-018-7351-3 .

Milićević, Sonja, Martinović, Sanja, Milošević, Vladan, Stojanović, Jovica, Povrenović, Dragan, "Differences in coating mechanism of structurally different aluminosilicates observed through the thermal analysis" in Journal of Thermal Analysis and Calorimetry, 134, no. 2 (2018):1011-1019,
https://doi.org/10.1007/s10973-018-7351-3 . .

TY  - JOUR
AU  - Milićević, Sonja
AU  - Povrenović, Dragan
AU  - Milošević, Vladan
AU  - Martinović, Sanja
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2060
AB  - In this paper the ability of three natural zeolites from different localities (Vranjska banja-VB, Igroš-I and Baia Mare-BM deposits) to remove copper has been investigated. These three zeolites were subjected to the elementary analysis as well as XRDP and DTA/TG analysis due to complete characterization. Cation exchange capacity of VB, I and BM zeolites were 150.1, 169.2, and 176.5 meq/100g. The maximum adsorption capacity for the copper adsorption on VB, I and BM-zeolites were 7.75, 8.51, and 11.18 mg/g. Based on the obtained results the mathematical expression that describes correlation between the CEC and copper adsorption capacity has been developed. This linear dependance has been tested with the vast variety of experimental results. According to this expression it is possible to predict the copper adsorption capacity for different zeolites based only on their CEC value.
AB  - U radu su prikazani rezultati ispitivanja uklanjanja jona bakra primenom tri prirodna zeolita sa različitih lokaliteta (Vranjska banja-VB, Igroš-I i Baia Mare-BM). U cilju karakterizacije zeolita, izvršena su ispitivanja elementarnog sastava, kao i rentgenska (XRDP) i termijska analiza (DTA/TG). Kapaciteti katjonske izmene (CEC) ispitivanih zeolita VB, I i BM iznose 150,1, 169,2 i 176,5 meq/100g. Maksimalni adsorpcioni kapaciteti bakra na VB, I i BM zeolitima iznose 7,75, 8,51, i 11,18 mg/g. Na osnovu ostvarenih rezultata, dobijena je matematička zavisnost koja dobro opisuje vezu između vrednosti CEC i adsorpcionog kapaciteta za bakar. Ova lineralna zavisnost je testirana primenom različitih eksperimentalnih rezultata. Primenom ove zavisnosti moguće je da se predvidi vrednost adsorpcionog kapaciteta bakra na različitim zeolitima poznavanjem njegove CEC vrednosti. .
PB  - University of Belgrade, Technical Faculty Bor
T2  - Journal of Mining and Metallurgy A: Mining
T1  - Predicting the copper adsorption capacity on different zeolites
T1  - Predviđanje adsorpcionog kapaciteta bakra na različitim zeolitima
VL  - 53
IS  - 1
SP  - 57
EP  - 63
DO  - 10.5937/JMMA1701057M
ER  - 

@article{
author = "Milićević, Sonja and Povrenović, Dragan and Milošević, Vladan and Martinović, Sanja",
year = "2017",
abstract = "In this paper the ability of three natural zeolites from different localities (Vranjska banja-VB, Igroš-I and Baia Mare-BM deposits) to remove copper has been investigated. These three zeolites were subjected to the elementary analysis as well as XRDP and DTA/TG analysis due to complete characterization. Cation exchange capacity of VB, I and BM zeolites were 150.1, 169.2, and 176.5 meq/100g. The maximum adsorption capacity for the copper adsorption on VB, I and BM-zeolites were 7.75, 8.51, and 11.18 mg/g. Based on the obtained results the mathematical expression that describes correlation between the CEC and copper adsorption capacity has been developed. This linear dependance has been tested with the vast variety of experimental results. According to this expression it is possible to predict the copper adsorption capacity for different zeolites based only on their CEC value., U radu su prikazani rezultati ispitivanja uklanjanja jona bakra primenom tri prirodna zeolita sa različitih lokaliteta (Vranjska banja-VB, Igroš-I i Baia Mare-BM). U cilju karakterizacije zeolita, izvršena su ispitivanja elementarnog sastava, kao i rentgenska (XRDP) i termijska analiza (DTA/TG). Kapaciteti katjonske izmene (CEC) ispitivanih zeolita VB, I i BM iznose 150,1, 169,2 i 176,5 meq/100g. Maksimalni adsorpcioni kapaciteti bakra na VB, I i BM zeolitima iznose 7,75, 8,51, i 11,18 mg/g. Na osnovu ostvarenih rezultata, dobijena je matematička zavisnost koja dobro opisuje vezu između vrednosti CEC i adsorpcionog kapaciteta za bakar. Ova lineralna zavisnost je testirana primenom različitih eksperimentalnih rezultata. Primenom ove zavisnosti moguće je da se predvidi vrednost adsorpcionog kapaciteta bakra na različitim zeolitima poznavanjem njegove CEC vrednosti. .",
publisher = "University of Belgrade, Technical Faculty Bor",
journal = "Journal of Mining and Metallurgy A: Mining",
title = "Predicting the copper adsorption capacity on different zeolites, Predviđanje adsorpcionog kapaciteta bakra na različitim zeolitima",
volume = "53",
number = "1",
pages = "57-63",
doi = "10.5937/JMMA1701057M"
}

Milićević, S., Povrenović, D., Milošević, V.,& Martinović, S.. (2017). Predicting the copper adsorption capacity on different zeolites. in Journal of Mining and Metallurgy A: Mining
University of Belgrade, Technical Faculty Bor., 53(1), 57-63.
https://doi.org/10.5937/JMMA1701057M

Milićević S, Povrenović D, Milošević V, Martinović S. Predicting the copper adsorption capacity on different zeolites. in Journal of Mining and Metallurgy A: Mining. 2017;53(1):57-63.
doi:10.5937/JMMA1701057M .

Milićević, Sonja, Povrenović, Dragan, Milošević, Vladan, Martinović, Sanja, "Predicting the copper adsorption capacity on different zeolites" in Journal of Mining and Metallurgy A: Mining, 53, no. 1 (2017):57-63,
https://doi.org/10.5937/JMMA1701057M . .

TY  - CONF
AU  - Milićević, Sonja
AU  - Milošević, Vladan
AU  - Vlahović, Milica
AU  - Martinović, Sanja
AU  - Povrenović, Dragan
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7313
AB  - During the mining process of copper exploitation, a large amount of wastewater is generated. Not only do the copper ions contaminate the water but also represent a great loss for the copper production industry. Negative charges surface of zeolite has been used for adsorption of copper. The batch and dynamic experiments have been conducted. After the adsorption, the zeolite has been regenerated with the concentrated solution of Na-salt. The volume of the regenerative solution is 30 times smaller compared to the total amount of the waste solution that has been purified and the concentation of the obtained solution is 12 gCu2+/dm3.
PB  - The Regional Environmental Center for Central and Eastern Europe
C3  - International Science Conference  Reporting for Sustainability, Conference Proceedings, 7th-10th May 2013, Bečići, Montenegro
T1  - Concentration method for the mining wastewater-valorization of the copper
SP  - 431
EP  - 435
UR  - https://hdl.handle.net/21.15107/rcub_cer_7313
ER  - 

@conference{
author = "Milićević, Sonja and Milošević, Vladan and Vlahović, Milica and Martinović, Sanja and Povrenović, Dragan",
year = "2013",
abstract = "During the mining process of copper exploitation, a large amount of wastewater is generated. Not only do the copper ions contaminate the water but also represent a great loss for the copper production industry. Negative charges surface of zeolite has been used for adsorption of copper. The batch and dynamic experiments have been conducted. After the adsorption, the zeolite has been regenerated with the concentrated solution of Na-salt. The volume of the regenerative solution is 30 times smaller compared to the total amount of the waste solution that has been purified and the concentation of the obtained solution is 12 gCu2+/dm3.",
publisher = "The Regional Environmental Center for Central and Eastern Europe",
journal = "International Science Conference  Reporting for Sustainability, Conference Proceedings, 7th-10th May 2013, Bečići, Montenegro",
title = "Concentration method for the mining wastewater-valorization of the copper",
pages = "431-435",
url = "https://hdl.handle.net/21.15107/rcub_cer_7313"
}

Milićević, S., Milošević, V., Vlahović, M., Martinović, S.,& Povrenović, D.. (2013). Concentration method for the mining wastewater-valorization of the copper. in International Science Conference  Reporting for Sustainability, Conference Proceedings, 7th-10th May 2013, Bečići, Montenegro
The Regional Environmental Center for Central and Eastern Europe., 431-435.
https://hdl.handle.net/21.15107/rcub_cer_7313

Milićević S, Milošević V, Vlahović M, Martinović S, Povrenović D. Concentration method for the mining wastewater-valorization of the copper. in International Science Conference  Reporting for Sustainability, Conference Proceedings, 7th-10th May 2013, Bečići, Montenegro. 2013;:431-435.
https://hdl.handle.net/21.15107/rcub_cer_7313 .

Milićević, Sonja, Milošević, Vladan, Vlahović, Milica, Martinović, Sanja, Povrenović, Dragan, "Concentration method for the mining wastewater-valorization of the copper" in International Science Conference  Reporting for Sustainability, Conference Proceedings, 7th-10th May 2013, Bečići, Montenegro (2013):431-435,
https://hdl.handle.net/21.15107/rcub_cer_7313 .

TY  - JOUR
AU  - Milićević, Sonja
AU  - Milošević, Vladan
AU  - Povrenović, Dragan
AU  - Stojanović, Jovica
AU  - Martinović, Sanja
AU  - Babić, Biljana
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6897
AB  - The increasing levels of industrial wastewater released to the environment present a serious
threat to human health, living resources, and ecological systems. Fe-modified zeolites were developed and tested for removal of Cu2+ and Zn2+ from contaminated water. The surfaces of the naturally occurring zeolite, clinoptilolite, were modified with Fe(III) oxyhydroxides using three different methods, denoted I, II, and III (FeCli1 , FeCli2, and FeNaCli1, respectively). The oxyhydroxides were prepared in Method I using 0.1 M FeCl3 · H2O in an acetate buffer (pH = 3.6); in Method II, using 10% FeCl3 · H2O solution in 0.1 M KOH (pH = 10); and Method III was the same as Method I except the clinoptilolite was pretreated with NaCl. Newly synthesized materials from these three methods were then tested for their ability to enhance the sorption capacity for Cu and Zn compared to the natural sample (Cli). Powder X-ray diffraction measurements and the chemical composition of these modified samples confirmed that
clinoptilolite maintained its structure while amorphous Fe3+ species were synthesized. The specific surface area (BET method) of both the natural and modified clinoptilolite increased by 2 and 7.5 times for Methods I and II, respectively. Scanning electron microscopy and energy dispersive X-ray spectroscopy revealed that CaO was formed during Method I (FeCli1). Throughout the adsorption process, the hydrolysis of CaO and the release of OH¯ caused the precipitation of Cu and Zn hydroxide, which made the determination of the sorption capacity of FeCli1 impossible. This phenomenon was avoided in Method III (FeNaCli1) because of the absence of exchangeable Ca2+. The adsorption experiments with method II resulted in
double-enchanced adsoprtion capacity. Laboratory batch experiments have shown that the sorption capacities increased in the following order: Cli < FeCli2 < FeNaCli1, for Cu: 0.121 mmol/g < 0.251 mmol/g < 0.403 mmol/g and for Zn: 0.128 mmol/g < 0.234 mmol/g < 0.381 mmol/g.
PB  - Springer
T2  - Clay and Clay Minerals
T1  - Removal of heavy metals from aqueous solutions using natural and Fe(III) oxyhydroxide clinoptilolite
VL  - 61
VL  - 517
IS  - 6
SP  - 508
DO  - 10.1346/CCMN.2013.0610603
ER  - 

@article{
author = "Milićević, Sonja and Milošević, Vladan and Povrenović, Dragan and Stojanović, Jovica and Martinović, Sanja and Babić, Biljana",
year = "2013",
abstract = "The increasing levels of industrial wastewater released to the environment present a serious
threat to human health, living resources, and ecological systems. Fe-modified zeolites were developed and tested for removal of Cu2+ and Zn2+ from contaminated water. The surfaces of the naturally occurring zeolite, clinoptilolite, were modified with Fe(III) oxyhydroxides using three different methods, denoted I, II, and III (FeCli1 , FeCli2, and FeNaCli1, respectively). The oxyhydroxides were prepared in Method I using 0.1 M FeCl3 · H2O in an acetate buffer (pH = 3.6); in Method II, using 10% FeCl3 · H2O solution in 0.1 M KOH (pH = 10); and Method III was the same as Method I except the clinoptilolite was pretreated with NaCl. Newly synthesized materials from these three methods were then tested for their ability to enhance the sorption capacity for Cu and Zn compared to the natural sample (Cli). Powder X-ray diffraction measurements and the chemical composition of these modified samples confirmed that
clinoptilolite maintained its structure while amorphous Fe3+ species were synthesized. The specific surface area (BET method) of both the natural and modified clinoptilolite increased by 2 and 7.5 times for Methods I and II, respectively. Scanning electron microscopy and energy dispersive X-ray spectroscopy revealed that CaO was formed during Method I (FeCli1). Throughout the adsorption process, the hydrolysis of CaO and the release of OH¯ caused the precipitation of Cu and Zn hydroxide, which made the determination of the sorption capacity of FeCli1 impossible. This phenomenon was avoided in Method III (FeNaCli1) because of the absence of exchangeable Ca2+. The adsorption experiments with method II resulted in
double-enchanced adsoprtion capacity. Laboratory batch experiments have shown that the sorption capacities increased in the following order: Cli < FeCli2 < FeNaCli1, for Cu: 0.121 mmol/g < 0.251 mmol/g < 0.403 mmol/g and for Zn: 0.128 mmol/g < 0.234 mmol/g < 0.381 mmol/g.",
publisher = "Springer",
journal = "Clay and Clay Minerals",
title = "Removal of heavy metals from aqueous solutions using natural and Fe(III) oxyhydroxide clinoptilolite",
volume = "61, 517",
number = "6",
pages = "508",
doi = "10.1346/CCMN.2013.0610603"
}

Milićević, S., Milošević, V., Povrenović, D., Stojanović, J., Martinović, S.,& Babić, B.. (2013). Removal of heavy metals from aqueous solutions using natural and Fe(III) oxyhydroxide clinoptilolite. in Clay and Clay Minerals
Springer., 61(6), 508.
https://doi.org/10.1346/CCMN.2013.0610603

Milićević S, Milošević V, Povrenović D, Stojanović J, Martinović S, Babić B. Removal of heavy metals from aqueous solutions using natural and Fe(III) oxyhydroxide clinoptilolite. in Clay and Clay Minerals. 2013;61(6):508.
doi:10.1346/CCMN.2013.0610603 .

Milićević, Sonja, Milošević, Vladan, Povrenović, Dragan, Stojanović, Jovica, Martinović, Sanja, Babić, Biljana, "Removal of heavy metals from aqueous solutions using natural and Fe(III) oxyhydroxide clinoptilolite" in Clay and Clay Minerals, 61, no. 6 (2013):508,
https://doi.org/10.1346/CCMN.2013.0610603 . .