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（英文）

发布时间：2018-01-07 13:18

本文关键词：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（英文）　出处：《催化学报》2017年04期 　论文类型：期刊论文

【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(BiVO_4)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,BiVO_4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,BiVO_4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.
[Abstract]:High quality polycrystalline bismuth vanadate BiVO4 thin films were prepared on F doped tin oxide substrates by a convenient two-step method involving electrodeposition and annealing. Scanning electron microscopy and transmission electron microscopy were used. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-Vis absorption spectra and Raman spectra were used to characterize the morphology and structure of the films. The BiVO_4 thin film is a monoclinic scheelite crystal structure with pure phase. The photochemical and photochemical PECs were used in the multiphase oxidation of chlorate ions in aqueous solution. UV-Vis adsorption spectrometer was used to monitor the decrease of chlorate concentration. BiVOC _ 4 can effectively catalyze the oxidation of chlorate by PEC method under the irradiation of light. The order of oxidation of chlorate is 1 order. The reaction rate constant of PEC process is obviously higher than that of EC and PC processes. At the same time, the mechanism of catalytic oxidation of chlorates based on the formation of perchloric acid ions is proposed.
【作者单位】：马利什泰尔大学科技大学化学系;马赞达兰大学化学学院电分析化学研究实验室;
【分类号】：TB383.2;O644.1
【正文快照】： 1.Introduction light of sufficient energy(hυ ≥ band gap,Eg),charge separation is induced,resulting in the formation of reactive electrons(e-) During the past decades,a large variety of advanced oxida-and holes(h+).These charge carriers can initiate oxi

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