Hydrothermal synthesis of BiVO4/TiO2 composites and their application for degradation of gaseous benzene under visible light irradiation
Hydrothermal synthesis of BiVO4/TiO2 composites and their application for degradation of gaseous benzene under visible light irradiation
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BiVO4/TiO2复合材料的水热合成及其在可见光照射下降解气态苯的应用
DOI：
10.1016/j.apsusc.2017.12.054
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发表时间：
2018-04-01
影响因子：
6.7
通讯作者：
Zou, Jiyong
中科院分区：
文献类型：
--
作者：
Hu, Yin;Chen, Wei;Zou, Jiyong
苯目前被认为是毒性最大的污染物之一。我们以前发表的研究表明，BiVO 4/TiO 2是一个优秀的光催化剂对苯的降解。本文采用溶胶-凝胶法和水热法合成了BiVO 4/TiO 2复合材料，通过调节前驱体的水解速率，采用不同的酸（CH 3COOH、HNO 3和H2SO 4）进行了合成。详细讨论了这些酸对光催化剂的物化性质和光催化性能的影响。X射线衍射和N2吸附分析证实，酸对结晶组成和BET比表面积有重要影响。在可见光照射下，以CH 3COOH为溶剂合成的BiVO 4/TiO 2光催化剂对气态苯的降解效果优于以HNO 3和H2SO 4为溶剂合成的BiVO 4/TiO 2光催化剂。XPS测试结果表明，BiVO 4/TiO 2-CH 3COOH中的羟基比BiVO 4/TiO 2-HNO 3和BiVO 4/TiO 2-H2SO 4中的羟基更丰富。光电流信号的电化学测量表明，BiVO 4/TiO 2/CH 3COOH体系能更有效地分离光生载流子。希望我们的工作可以提供有价值的信息，设计具有增强性能的二氧化钛复合材料。(C)2017爱思唯尔B. V.保留所有权利。
Benzene is currently recognized as one of the most toxic contaminants. Our previously published study revealed that BiVO4/TiO2 is an excellent photocatalyst toward the degradation of benzene. Herein, BiVO4/TiO2 has been synthesized via a sol-gel method and a facile hydrothermal route by adjusting the precursor hydrolysis rate with the use of different acids (CH3COOH, HNO3 and H2SO4). The influence of these acids on the physicochemical characteristics and photocatalytic performance is discussed in detail. X-ray diffraction and N-2 sorption analyses confirm that acid has an important effect on the crystalline composition and BET specific surface area. BiVO4/TiO2 synthesized in CH3COOH has better photocatalytic activity for the degradation of gaseous benzene than that in HNO3 and H2SO4 under visible light irradiation. Results of XPS measurement demonstrate that the hydroxyl group in BiVO4/TiO2-CH3COOH is more abundant than that in BiVO4/TiO2-HNO3 and BiVO4/TiO2-H2SO4. The photocurrent signal is investigated by electrochemical measurement, which indicates that more effective separation of photogenerated carriers occurs in the BiVO4/TiO2/CH3COOH system. It is hoped that our work can offer valuable information on the design of TiO2 composites with enhanced properties. (C) 2017 Elsevier B.V. All rights reserved.