可见光响应型Bi2WO6光催化剂

Visible-Light Responsed Bi_2WO_6 Photocatalysts

Bi2WO6作为一种新型半导体光催化剂,具有较窄的带隙宽度和特殊的层状结构,因而显示出良好的可见光催化性能。本文综述了围绕提高Bi2WO6的光催化活性和实用性而开展的相关研究成果,包括:纳米结构Bi2WO6材料;分级超结构Bi2WO6材料;Bi2WO6光催化剂的系列修饰改性,如金属氧化物复合、碳烯和金属单质的表面沉积,以及金属离子和非金属离子的掺杂等。此外,还从回收角度综述了Bi2WO6的固定化技术。最后对Bi2WO6光催化剂的发展趋势进行了展望,强调对Bi2WO6进行带隙调控,并加强对其异质结构界面状态的研究,通过理论计算可深入理解光催化机制,以从制备入手指导现有催化剂的改良和设计新型光催化剂。

Bi2WO6 materials exhibit excellent visible-light photocatalytic activity due to the narrow band gap and special layered structure. This paper summarizes the research achievements on the improvements of photocatalytic property and practicability of Bi2WO6. Nanostructured Bi2WO6 materials are firstly introduced. The fabrication of Bi2WO6 nanostructures is found to be an effective strategy to enhance the photocatlytic activity for high surface areas. Then works on hierarchical Bi2WO6 superstructures are presented. In comparison with tiny Bi2WO6 nanostructures, the microscale superstructures are more practical for easy recovery. And channels or mesopores which are beneficial for ion transport often appear among nanostructured building units. Then, the modification of Bi2WO6 photocatalyst is summarized which includes the composite heterostructures with metal oxides, surface deposition of metal or grapheme, and doping with metal ion or non-metal ion, etc. In addition, the immobilization techniques of Bi2WO6 materials are reviewed. Finally, the development trend of Bi2WO6 photocatalyts is prospected. It is emphasized that the band gap adjustment of Bi：WO6 and interfacial states of its heterostructures should be strengthened. And theoretical calculation would assist to in-depth understand the photocatalytic mechanism, which would be helpful in the improvement of existing photocatalysts and designing novel visible-light responsive photocatalyst.