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Enhanced photoelectrocatalytic degradation of norfloxacin by an Ag3PO4/BiVO4 electrode with low bias
Cao, Di; Wang, Yanbin; Qiao, Meng; Zhao, Xu
2018-04-01
Source PublicationJOURNAL OF CATALYSIS
ISSN0021-9517
Volume360Pages:240-249
AbstractIn this work, an Ag3PO4-modified BiVO4 electrode was prepared on an FTO substrate and used as a photoanode for photoelectrocatalytic degradation of organic contaminants. The photocurrent generated from the synthesized Ag3PO4/BiVO4 photoelectrode under visible light irradiation was more than twice that from pure the BiVO4 electrode, which could be attributed to the lower recombination rate of the photo generated electron-hole pairs of the Ag3PO4/BiVO4 photoanode, as proved by the electrochemical impedance spectroscopy and photoluminescence spectra. The Ag3PO4/BiVO4 electrode was effective for the oxidation of organic pollutants in photoelectrocatalysis systems at relatively low bias potentials. A higher photoelectrocatalytic activity for norfloxacin degradation was observed when the Ag3PO4/BiVO4 electrode was than with the BiVO4 electrode, where norfloxacin with an initial concentration of 5 mg/L could be degraded within 90 min. The apparent rate constants of norfloxacin degradation using a BiVO4 electrode and Ag3PO4/BiVO4 are estimated to be 2.83 x 10(-4) min(-1) (R-2 = 0.994) and 7.94 x 10(-4) min(-1) (R-2 = 0.996), respectively. Analysis of the degradation intermediates indicated that the piperazine ring and the carboxyl group of the norfloxacin were attacked during the degradation process. The Ag3PO4/BiVO4 photoanode was also proved to be effective for the degradation of two other antibiotics, sulfamethoxazole and oxytetracycline. (C) 2018 Elsevier Inc. All rights reserved.
Department中国科学院饮用水科学与技术重点实验室
KeywordPhotoelectrooxidation BiVO4 Ag3PO4/BiVO4 composite electrode Norfloxacin Degradation Antibiotics
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/41362
Collection中国科学院饮用水科学与技术重点实验室
Recommended Citation
GB/T 7714
Cao, Di,Wang, Yanbin,Qiao, Meng,et al. Enhanced photoelectrocatalytic degradation of norfloxacin by an Ag3PO4/BiVO4 electrode with low bias[J]. JOURNAL OF CATALYSIS,2018,360:240-249.
APA Cao, Di,Wang, Yanbin,Qiao, Meng,&Zhao, Xu.(2018).Enhanced photoelectrocatalytic degradation of norfloxacin by an Ag3PO4/BiVO4 electrode with low bias.JOURNAL OF CATALYSIS,360,240-249.
MLA Cao, Di,et al."Enhanced photoelectrocatalytic degradation of norfloxacin by an Ag3PO4/BiVO4 electrode with low bias".JOURNAL OF CATALYSIS 360(2018):240-249.
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