二氧化钛光催化剂改性研究进展

光催化技术在处理有机污染物领域是一种资源节约、环境友好、极具应用前景的新型绿色环保技术。二氧化钛作为一种典型的半导体光催化剂,因具有光活性好、稳定性好、对人体无毒害、成本低廉、反应条件温和且无二次污染等特点而深受人们的青睐。然而它的宽带隙和较高的光生电子-空穴对复合率限制了它的大规模应用,这都是需要解决的技术难题。讲解了二氧化钛的催化机理,分析了传统二氧化钛的局限性,针对这些缺点介绍了提高二氧化钛催化活性的改性方法及原理,如离子掺杂、表面沉积贵金属、表面光敏化、半导体复合、负载等方法。讨论了二氧化钛光催化剂未来的研究和发展方向。

Research progress in modification of TiO2 photocatalyst

Photocatalysis technology is a new green environmental protection technology with resource saving,environmental friendliness and great application prospect in the field of organic pollutant treatment.As a typical semiconductor photocatalyst,TiO₂ is favored by people for its good photoactivity,good stability,non-toxic to human health,low cost,mild reaction conditions and no secondary pollution etc..However,its wide band gap and higher recombination rate of photogenerated electronhole pair limit its large-scale application,which are technical problems to be solved.The catalytic mechanism of TiO₂ was explained.The limitations of traditional TiO₂ were analyzed.And the modification methods and principles for improving the catalytic activity of TiO₂,such as ion doping,surface deposition of precious metals,surface photosensitization,semiconductor composite,load and other methods,were introduced.At last the future research and development direction of TiO₂ photocatalyst were discussed.