摘要：

采用溶胶-凝胶方法,经过数次浸渍制备成负载型纳米TiO₂光催化剂,研究光催化氧化降解酸性玫瑰红B(简写为AR)。考察了浸渍次数和煅烧温度对光催化活性的影响,表明浸渍3次和煅烧温度为550℃时催化剂的活性最好。研究了掺杂镧的催化剂活性并与P25作了比较,掺杂镧后,催化剂活性明显提高,光催化活性比P25高出13.5%。同时进行了负载型TiO₂/硅胶的动力学研究,表明光催化降解AR过程符合伪一级反应动力学模型。

关键词: 光催化氧化, 酸性玫瑰红B, 二氧化钛

Abstract:

The loaded nanometer TiO₂ photocatalysis is prepared by sol-gel method, being dipped for several times. Photocatalysis, oxidation for the degradation of acid red 52(AR) has been studied. The effect of dipping times and calcination temperature on photocatalysis activity have been investigated. The results show that the photocat-alysis activity is the best when the dipping times is 3 and the calcination temperature is 550℃. The activity of catalysis which is adulterated with La has been studied and a comparison of its activity to P25 is made. After being adulterated with La, its catalysis activity is improved obviously. The photocatalysis activity is 13.5% higher than P25. At the same time, a kinetics study of the loaded TiO₂/silica gel has been made. The results indicate that the process of degrading AR by photocatalysis accords with the pseudo-first-grade-reaction-kinetics model.

Key words: photocatalysis, acid red 52, titanium dioxide

中图分类号: 

• X703.1