| BiVO4/BiPO4复合物的制备及可见光催化性能 |
| Preparation of BiVO4/BiPO4 Composites With Enhanced Visible-Light-Driven Photocatalytic Properties |
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| 摘要: 采用水热法合成出具有不同V、P物质的量之比的BiVO4/BiPO4复合物.nV/nP分别为:0.1/9.9、0.5/9.5、1/9、3/7、5/5.采用 XRD、FE-SEM、EDS、拉曼、可见光光度计、漫反射以及电化学等测试手段对BiVO4/BiPO4复合物进行表征.在可见光条件下降解亚甲基蓝来评价BiVO4/BiPO4复合物的光催化活性.结果显示,当nV/nP<3/7的时候,BiVO4/BiPO4复合物的光催化活性随着BiVO4含量的增加而增加,当nV/nP=3/7的时候,复合物具有最佳的光催化性能,反应速率常数k为0.005 1 min-1,是纯BiPO4的23.2倍.BiVO4/BiPO4复合物的光催化机制主要是由于BiVO4的加入,提高了电子-空穴的分离率,进而提高了光催化活性. |
| 关键词: 水热法 BiVO4 BiPO4 光催化活性 电子-空穴对 |
| 基金项目: 国家自然科学基金(No.21276036),交通运输部建设科技项目(No.2014328204050)和中央高校基本科研业务费(No.3132015085)资助项目. |
| Abstract: BiVO4/BiPO4 composites with different nV/nP molar ratios were synthesized by a simple one-pot hydrothermal method. The nV/nP molar ratios were 0.1/9.9, 0.5/9.5, 1/9, 3/7, and 5/5, respectively. The BiVO4/BiPO4 composites were characterized by X-ray diffraction, field emission scanning electron microscope, energy-dispersive spectroscopy, Raman spectrum, UV-Vis spectrophotometer, UV-Vis diffuse reflectance spectroscopy, and electrochemical impedance spectra. The photocatalytic activities of BiVO4/BiPO4 composites were evaluated by the degradation of methylene blue (MB) under visible light irradiation (λ>420 nm). When the ratios of the BiVO4/BiPO4 composites were less than 3/7, the photocatalytic activities of BiVO4/BiPO4 composites were enhanced with an increasing amount of BiVO4. The result showed that the BiVO4/BiPO4 composite ratio for nV/nP=3/7 possessed the highest photocatalytic activity. The BiVO4/BiPO4 composite ratio for nV/nP=3/7 possessed the maximal k value of 0.005 1 min-1. It is 23.2 times of the pure BiPO4. The photocatalytic mechanism of the BiVO4/BiPO4 composites could be mainly ascribed to the existence of BiVO4 which could accelerate the separation and migration efficiency of photogenerated carriers. |
| Keywords: hydrothermal BiVO4 BiPO4 photocatalytic activity electron-hole pairs |
| 投稿时间：2015-07-22 修订日期：2016-01-13 |
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| 尹延峰,周锋,詹溯,杨一凡,刘昱君.BiVO4/BiPO4复合物的制备及可见光催化性能[J].无机化学学报,2016,32(3):483-490. |
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