用于光电化学氧化氯酸盐的钒酸铋光电阳极的合成与表征

doi:10.1016/S1872-2067(17)62788-8

催化学报 ›› 2017, Vol. 38 ›› Issue (4): 710-716.DOI: 10.1016/S1872-2067(17)62788-8

用于光电化学氧化氯酸盐的钒酸铋光电阳极的合成与表征

Seyed Ghorban Hosseini^a, Saeid Safshekan^b

a 马利什泰尔大学科技大学化学系, 德黑兰 16765-3454, 伊朗;
b 马赞达兰大学化学学院电分析化学研究实验室, 巴博勒, 伊朗

收稿日期:2016-12-17 修回日期:2017-01-14 出版日期:2017-04-18 发布日期:2017-04-12
通讯作者: Seyed Ghorban Hosseini

Synthesis, characterization and application of BiVO₄ photoanode for photoelectrochemical oxidation of chlorate

Seyed Ghorban Hosseini^a, Saeid Safshekan^b

a Department of Chemistry, Malek Ashtar University of Technology, P.O.Box 16765-3454, Tehran, Iran;
b Electroanalytical Chemistry Research Laboratory, Faculty of Chemistry, University of Mazandaran, Babolsar, Iran

Received:2016-12-17 Revised:2017-01-14 Online:2017-04-18 Published:2017-04-12

摘要/Abstract

摘要：

采用便捷的涉及电沉积和退火过程的两步法在F掺杂的氧化锡基体上制备了高品质的多晶钒酸铋（BiVO₄）薄膜，并运用扫描电镜、透射电镜、X射线衍射（XRD）、傅里叶变换红外光谱、紫外-可见光吸收光谱和拉曼光谱表征了所制薄膜的形貌和结构特征.XRD和光学分析结果表明，BiVO₄薄膜为纯相的单斜白钨矿晶相结构.将该薄膜通过电化学（EC），光化学（PC）和光电化学（PEC）过程用于水溶液中氯酸离子的多相氧化反应中.采用紫外-可见吸附光谱仪监测氯酸盐浓度的降低.结果发现，在光的照射下采用PEC法时，BiVO₄可有效催化氯酸盐的氧化.氯酸盐氧化反应级数为1级，PEC过程的反应速率常数明显高于EC和PC过程的.同时，提出了基于形成了高氯酸离子的催化氧化氯酸盐的反应机理.

关键词: 钒酸铋, 光催化, 电子-空穴对, 氯酸盐氧化, 光化学反应

Abstract:

A high-quality polycrystalline bismuth vanadate (BiVO₄) film was prepared on a fluorine-doped tin oxide substrate via a facile two-step strategy involving electrodeposition and annealing processes. The morphology and structural characterization of the resulting film were investigated by different methods including scanning electronmicroscopy, transmission electron microscopy,X-ray diffraction (XRD), and Fourier transform infrared, ultraviolet-visible (UV-vis) absorption, and Raman spectroscopies. XRD patterns as well as optical measurements revealed that BiVO₄ film crystallized with a pure monoclinic scheelite structure. The prepared BiVO₄ film was used for heterogeneous oxidation of chlorate ions in aqueous solution via electrochemical (EC), photochemical (PC), and photoelectrochemical (PEC) processes. The decrease in concentration of chlorate was monitored using UV-vis absorption spectroscopy. The results revealed that BiVO₄ could effectively perform chlorate oxidation under light irradiation through a PEC method. The kinetics of chlorate oxidation was consistent with a first-order reaction, and the rate constant for the PEC process was found to be much higher than those of EC and PC. Furthermore, a possible photocatalytic oxidation mechanism for chlorate mainly based on the formation of perchlorate ions is proposed.

Key words: Bismuth vanadate, Photocatalysis, Electron-hole pair, Chlorate oxidation, Photochemical reaction

Seyed Ghorban Hosseini, Saeid Safshekan. 用于光电化学氧化氯酸盐的钒酸铋光电阳极的合成与表征[J]. 催化学报, 2017, 38(4): 710-716.

Seyed Ghorban Hosseini, Saeid Safshekan. Synthesis, characterization and application of BiVO₄ photoanode for photoelectrochemical oxidation of chlorate[J]. Chinese Journal of Catalysis, 2017, 38(4): 710-716.

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用于光电化学氧化氯酸盐的钒酸铋光电阳极的合成与表征

Synthesis, characterization and application of BiVO₄ photoanode for photoelectrochemical oxidation of chlorate

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用于光电化学氧化氯酸盐的钒酸铋光电阳极的合成与表征

Synthesis, characterization and application of BiVO4 photoanode for photoelectrochemical oxidation of chlorate

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Synthesis, characterization and application of BiVO₄ photoanode for photoelectrochemical oxidation of chlorate