二氧化钛可见光光催化剂研究进展

综述了二氧化钛可见光化的一些理论观点及其改性技术的新进展,涉及染料光敏化、金属离子掺杂、贵金属沉积和复合半导体、非金属掺杂等,认为二氧化钛可见光化中的改性,实际上是使催化剂产生靠近导带或价带的内带隙的过程,并且这个新形成的带隙能使催化剂对可见光产生有效的响应。针对二氧化钛光催化剂实用化中存在的问题,指出有效地抑制电子复合是今后改性研究的重点,寻找低成本的光敏物质或使污染物本身具有较好的光敏化性能是今后光敏化研究的方向之一。

Research progress of titanium dioxide visible-light photocatalysts

Visible-light photocatalysts of titanium dioxide have significance in the practical application.The latest modification technology progress and their relevant opinions in titanium dioxide visible-light photocatalysts are introduced,including surface sensitization,metal ion doping,noble metal loading,composite semiconductors,nonmetal doping,etc.It is pointed out that the modification actually is such a process that makes the phtotocatalysts produce an inner band gap that nears the conduction band or valence band which can effectively respond to the visible-light.As to the problems in practical application,further study on modification should be focused on how to effectively hinder the electron from recombination,and a research direction of the sensitization to find relatively economical photosensitive materials or make an organic pollutant itself photosensitive.