Electrochemical behavior of H3PW12O40/acid-activated bentonite powders
Elektorhemijsko ponašanje praha kiselo-aktiviranog bentonita modifikovanog H3PW12O40 kiselinom
2012
Аутори
Mojović, ZoricaRožić, Ljiljana
Novaković, Tatjana
Vuković, Zorica
Petrović, Srđan
Randjelović, Danijela
Mitrić, Miodrag
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
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 rezul...tati 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.
Кључне речи:
bentonite modified electrode / phosphotungstic acid / oxidation of nitrites / cyclic voltammetry / elektrode od modifikovanog bentonita / fosforvolframska kiselina / oksidacija nitrita / ciklična voltametrijaИзвор:
Chemical Industry and Chemical Engineering Quarterly / CICEQ, 2012, 18, 2, 329-338Издавач:
- Association of the Chemical Engineers of Serbia
Финансирање / пројекти:
- Динамика нелинеарних физичкохемијских и биохемијских система са моделирањем и предвиђањем њихових понашања под неравнотежним условима (RS-MESTD-Basic Research (BR or ON)-172015)
- Наноструктурни функционални и композитни материјали у каталитичким и сорпционим процесима (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45001)
DOI: 10.2298/CICEQ110907009M
ISSN: 1451-9372
WoS: 000309644600019
Scopus: 2-s2.0-84864468509
Институција/група
IHTMTY - 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 . .