(1. 深圳职业技术学院 建筑与环境工程学院，深圳 518055；
2. 中南大学 冶金科学与工程学院，长沙 410083)
摘 要: 以锐钛矿、金红石及混晶TiO2作光催化剂，研究了H2O2在TiO2可见光催化反应过程中的作用机理。结果表明，H2O2在TiO2表面活性位吸附后可拓宽TiO2的光吸收范围至可见光区；通过对反应体系的荧光光谱分析显示，金红石型TiO2在H2O2存在条件下，经可见光激发可持续稳定产生羟基自由基∙OH。光催化实验表明，往反应体系中加入H2O2后，3种光催化剂均能可见光催化降解苯酚，且金红石型TiO2显示出最高的催化活性，反应120 min对苯酚的降解率达80%；在TiO2可见光催化反应过程中，由锐钛矿型TiO2经一系列复杂反应产生H2O2，生成的H2O2虽只是一中间产物，但对污染物的可见光催化降解起决定性作用。
关键字: H2O2；TiO2；可见光催化
（1. School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, China;
2. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract: The effects of H2O2 on TiO2 visible-light photocatalytic performance were studied, using anatase, rutile and mixing crystalline TiO2 as photocatalysts. The results indicate that the absorption of H2O2 on TiO2 surface to form active species extends the light absorption range of TiO2 into the visible light region. Fluorescence spectrum analysis indicates that the ∙OH radical free from rutile TiO2 surface can be constantly produced under visible light irradiation with addition of H2O2. The photocatalytic tests indicate that phenol can be visible-light photocatalytic degraded with the addition of H2O2 by any one of the three photocatalysts, and the rutile form exhibits the best photocatalytic activity, its degradation ratio can be 80% after 120 min reaction. In the process of TiO2 visible-light photocatalysis, hydrogen peroxide is generated by anatase TiO2 from a series of complex reaction, and the generated hydrogen peroxide is only an intermediate, which is responsible for the degradation of organic pollutants under visible light irradiation.
Key words: hydrogen peroxide; titanium dioxide; visible-light photocatalytic
