期刊
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
卷 117, 期 -, 页码 103-111出版社
ELSEVIER
DOI: 10.1016/j.jtice.2020.12.004
关键词
Phenazopyridine; Anodic oxidation; IrO2-Ta2O5 anode; Electrochemical degradation; Water treatment
资金
- University of Tabriz
Electrochemical degradation of a resistant pharmaceutical, Phenazopyridine hydrochloride (PhP), was evaluated on three different dimensionally stable anodes. The main objective of this study was to investigate the catalytic performance of the three Ti-based multilayer IrO2/Ta2O5 coated anodes which were made up by thermal decomposition method. The effect of operative parameters including current intensity (mA), initial pH of the solution, initial concentration of PhP (mg L-1) and electrolysis time were investigated comprehensively. This comparative study demonstrated that PhP mineralization was occurred consequently on the Ti/IrO2-Ta2O5 (70-30) and Ti/IrO2-Ta2O5 (50-50) electrodes rapidly but it was much slower on the Ti/IrO2-Ta2O5 (30-70) electrode. The performance of the electrodes revealed that the percentage of anodic materials alters the PhP degradation rate. The developed electrodes were characterized by scanning electronic microscope and energy dispersive x-ray spectroscopy. Cyclic voltammetry and electrochemical impedance spectroscopy studies were performed to investigate the efficiency of the electrodes. Decolorization of Php samples were carried out with UV-Vis spectroscopy. Furthermore, complete mineralization of PhP on Ti/IrO2-Ta2O5 (70-30) was confirmed by total organic carbon (TOC) analysis. The TOC results have shown higher mineralization of PhP (72.2%) in 180 min of electrolysis. Moreover, the intermediates were identified during electrochemical degradation of PhP by GC-MS. (c) 2020 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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