Open AccessElectrochemical behavior of H3PW12O40/ acid-activated bentonite powders
Author(s) -
Zorica Mojović,
Ljiljana Rožić,
Tatjaovaković,
Ž. Vuković,
Srdjan Petrović,
Danijela Randjelović,
Miodrag Mitrić
Publication year - 2012
Publication title -
chemical industry and chemical engineering quarterly
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.189
H-Index - 26
eISSN - 2217-7434
pISSN - 1451-9372
DOI - 10.2298/ciceq110907009m
Subject(s) - bentonite , electrochemistry , cyclic voltammetry , mesoporous material , crystallite , materials science , adsorption , chemical engineering , electrode , desorption , inorganic chemistry , chemistry , catalysis , organic chemistry , metallurgy , engineering
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/Aelectrodes were studied in the oxidation of NO2-ions and the results revealed that the electrodes possessed relatively higher nitrite oxidation currents than Aelectrode. The best electroactivity was observed for HPW3/Aelectrode (AAB+20 wt. % HPW) and the limit of detection (3σ) was determined as 8 μM