Bi_2WO_6光催化机理分析与性能优化的研究进展

Optimization of photocatalytic activity and analysis on photocatalysis mechanism of Bi_2WO_6

钨酸铋(Bi_2WO_6)光催化剂已被证实具有良好的光催化性能,但由于其光响应范围较窄、光量子效率较低等问题,影响其催化活性,因此对现有体系的形貌调控、改性具有十分重要的意义。在阐述Bi_2WO_6光催化机理的基础之上,重点从界面修饰、能级调控、晶格结构以及量子尺寸效应四个方面,归纳了Bi_2WO_6及其复合材料的能效提高机理,分析了改性的手段并总结了其优化措施。可以预测,通过从形貌、改性两方面分析,利用多元杂化方式对其改性将会是其作为光催化剂处理能源与环境问题的一个重要手段。

Bi_2WO_6 semiconductor with superior photocatalytic activity and advantages such as strong oxidizability,corrision resistance to light,controllable morphology,non-toxic and pollution free,has become the research hotspot recently.However,its narrow range of photoresponse and the low visiblelight-induced photocatalytic activity effect its catalyst activity.Therefore,it is of great importance to modify and control the morphology of present system.This article,in reviewing of its photochemical catalysis machanism,summarized energy efficiency mechanism improvement of Bi_2WO_6 semiconductor and its composite materials on the aspects of interfacial modification,energy level,changes in lattice structure and quantum dimension effect,and concluded optimizing methods for them.It can be estimated that improving both the modifying and morphology of Bi_2WO_6 semiconductor will be key ways to solve the energy and environmental problems.