当前位置: X-MOL 学术J. Catal. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Enhanced photoelectrocatalytic degradation of norfloxacin by an Ag3PO4/BiVO4 electrode with low bias
Journal of Catalysis ( IF 6.5 ) Pub Date : 2018-02-24 , DOI: 10.1016/j.jcat.2018.01.017
Di Cao , Yanbin Wang , Meng Qiao , Xu Zhao

In 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 photogenerated 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 × 10−4 min−1 (R2 = 0.994) and 7.94 × 10−4 min−1 (R2 = 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.



中文翻译:

Ag 3 PO 4 / BiVO 4电极在低偏压下增强了诺氟沙星的光电催化降解

在这项工作中,在FTO基板上制备了Ag 3 PO 4修饰的BiVO 4电极,并将其用作光阳极催化光电降解有机污染物的阳极。合成的Ag 3 PO 4 / BiVO 4光电极在可见光照射下产生的光电流是纯BiVO 4电极的两倍,这可能是由于Ag 3的光生电子-空穴对的复合率较低通过电化学阻抗谱和光致发光光谱证明,PO 4 / BiVO 4光电阳极。银3PO 4 / BiVO 4电极在较低的偏压下可有效地氧化光电催化系统中的有机污染物。当Ag 3 PO 4 / BiVO 4电极比BiVO 4电极时,观察到了更高的对诺氟沙星降解的光电催化活性,其中初始浓度为5 mg / L的诺氟沙星可以在90分钟内降解。使用BiVO 4电极和Ag 3 PO 4 / BiVO 4的诺氟沙星降解的表观速率常数估计为2.83×10 -4 min -1R2  = 0.994)和7.94×10 -4 min -1R 2  = 0.996)。对降解中间体的分析表明,在降解过程中哌嗪环和诺氟沙星的羧基均受到攻击。还证明了Ag 3 PO 4 / BiVO 4光电阳极可有效降解其他两种抗生素磺胺甲恶唑和土霉素。

更新日期:2018-02-24
down
wechat
bug