可见光响应WO_3光催化材料的研究进展

Research Progress of Visible-light Responsive Photocatalyst of WO_3

光催化材料在治理环境污染问题特别是大气污染和水污染方面表现出良好的应用前景。综述了可见光响应的WO_3光催化材料近些年的研究进展,指出通过调整和优化制备方法可以获得不同形貌特征的WO_3粉体光催化材料,而制备的具有大比表面积和高结晶性的WO_3粉体往往表现出高的光催化活性;跟WO_3粉体相比,WO_3薄膜实现了其在衬底表面的负载,不存在分离回收及失活等缺点,具有可观的实际应用价值,但其光催化活性有待进一步提高;通过构建异质结或形成复合材料可以提高WO_3薄膜光催化活性,也可通过贵金属单质沉积调控WO_3薄膜能带结构进而增强光催化活性;贵金属合金团簇亦可大大提高WO_3光催化活性,这一新方法为改善WO_3光催化活性的研究提供了一个新思路,具有重要应用前景。

Photocatalysts exhibit a good application prospect in the control of environment pollution, especially for the air pollutionand water pollution. This paper reviews the research progress of visible-light responsive photocatalyst of WO3 in recent years. WO3powder photocatalyst with different morphology features could be obtained by adjusting and optimizing of the preparation conditions,and the as -prepared WO3 powder photocatalyst with large surface area and high crystallinity always shows excellent photocatalyticactivity. Compared with WO3 powder, WO3 thin film has considerable practical application value since it was loaded on the surfaceof the substrate without the disadvantage of recycling as well as separation and inactivation. However, it is necessary to further im-prove the photocatalytic activity of pure WO3 thin film, which can be enhanced by designing the heterojunction or forming compositematerials and can also be performed through deposition of noble metals to adjust the band structure of WO3 thin film. In particular,recent research suggests the photocatalytic activity of WO3 could be enhanced greatly by decorating of noble metal alloy clusters.This new method opens a window for improving the photocatalytic activity of WO3 and possesses an important application prospect.