Selective synthesis and visible-light photocatalytic activities of BiVO4 with different crystalline phases
Selective synthesis and visible-light photocatalytic activities of BiVO4 with different crystalline phases
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DOI：
10.1016/j.matchemphys.2007.02.008
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发表时间：
2007-05
影响因子：
4.6
通讯作者：
Xi Zhang;Zhihui Ai;Falong Jia;Lizhi Zhang;Xiaoxing Fan;Z. Zou
中科院分区：
文献类型：
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作者：
Xi Zhang;Zhihui Ai;Falong Jia;Lizhi Zhang;Xiaoxing Fan;Z. Zou
采用水相法选择性合成了四斜晶系和单斜晶系钒酸铋（BiVO 4）粉体。采用X射线衍射、氮吸附、扫描电镜和紫外-可见漫反射光谱对所制备的BiVO 4粉体进行了表征。以亚甲基蓝溶液为降解对象，在可见光（λ> 420 nm）照射下，测定了不同BiVO 4样品的光催化活性，并与TiO 2（Degussa P25）的光催化活性进行了比较。利用紫外-可见漫反射光谱测定了BiVO 4的禁带宽度。结果表明，单斜晶系BiVO 4（带隙为2.34eV）的光催化活性高于四斜晶系BiVO 4（带隙为3.11eV）。
Tetragonal and monoclinic bismuth vanadate (BiVO4) powders were selectively synthesized by aqueous processes. The characterizations of the as-prepared BiVO4powders were carried out by X-ray diffraction, nitrogen adsorption, scanning electron microscopy and UV–vis diffuse reflectance spectroscopy. The photocatalytic activities of different BiVO4samples were determined by degradation of methylene blue solution under visible-light irradiation (λ>420nm) and compared with that of TiO2(Degussa P25). The band gaps of the as-prepared BiVO4were determined from UV–vis diffuse reflectance spectra. It was found that monoclinic BiVO4with a band gap of 2.34eV showed higher photocatalytic activity than that of tetragonal BiVO4with a band gap of 3.11eV.