二氧化钛紫外光催化降解有机废气研究进展

Progress on TiO_2-based UV Photocatalysis for Degradation of Organic Waste Gas

挥发性有机污染物(VOCs)是近年来逐渐被人们所重视的大气污染物之一,对这类大气污染物的控制尚缺少经济有效的技术手段。现在比较广泛采用的治理技术如吸收法、吸附法、冷凝法和燃烧法等都普遍存在投资运行费用高、容易引起二次污染等问题。而二氧化钛(TiO)2紫外光催化技术是近年来兴起的污染治理技术,具有费用低、净化效率高,无二次污染等特点。文章在综述TiO2催化原理、催化剂制备和结构表征等的基础上,重点介绍了这类催化剂在含氯、芳香烃类、醛酮类、含氮硫恶臭类等有机废气污染治理中的应用,并简要探讨了TiO2紫外光催化技术的发展前景。

Volatile organic compounds （VOCs） are one of atmospheric pollutants that have caused great attentions in recent year. However there is still lack of cost-effective methods for control of these pollutants. Some traditional treatments, like adsorption, condensation and combustion, have many disadvantages such as high operating cost and secondary pollution. TiO2-based UV photocatalysis is a novel pollution control technology raised in recent years, which has characteristics of lower cost and higher removal efficiencies, without any secondary pollution. TiO2-based catalytic mechanism, catalyst preparation and structural characterization were reviewed. Applications of TiO2-based UV photocatalysis in waste gas including chlorine, aromatic hydrocarbons, aldehydes and ketones, a nitrogen-containing sulfur-containing treatment were also introduced. Potential applications of TiO2-based UV photocatalysis were also briefly discussed.