不同紫外光源下MnO_2对TiO_2光催化活性的影响  

Influence of MnO_2 on the Photocatalytic Activity of TiO_2 Under Different UV Sources

作　　者：巩亚敏[1] 马子川[1,2] 李顺军[1] 张洁[1] 刘敬泽[2] 

机构地区：[1]河北师范大学化学与材料科学学院,石家庄050016 [2]河北师范大学生命科学学院,石家庄050016

出　　处：《高等学校化学学报》2008年第11期2223-2226,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20477009);河北省自然科学基金(批准号:E2005000183)资助

摘　　要：采用动力学方法研究了3种紫外光源下MnO2颗粒物对TiO2光催化活性的影响,使用的光源包括UV365/28 W,UV302/16 W和UV254/25 W,实验用的MnO2包括α-MnO2,β-MnO2和δ-MnO2.实验结果表明,当水悬浮液中有MnO2颗粒物存在时,在UV365/28W和UV302/16W两种紫外光源下TiO2光催化剂会失活,而在UV254/25W紫外光源下TiO2光催化剂能基本保持稳定.TiO2光催化剂的稳定性与使用的紫外光源的波长有关.The influences of MnO2 particles on the photocatalytic activity of Degussa P-25 TiO2 were investigated with kinetical method under three kinds of UV sources, which are UV365/28 W, UV302/16 W and UV254/25 W. α-MnO2, β-MnO2 and δ-MnO2 were introduced in the experiment. The results show that TiO2 photocatalyst deactivates due to the presence of MnO2 particles under UV365/28 W and UV302/16 W, while the photocatalytic activity of TiO2 basically keeps stable photocatalysis activity under UV254/25 W. In conclusion, the stability of TiO2 photocatalyst is significantly related to the wavelength of UV sources.

关 键 词：二氧化钛 二氧化锰 失活 光催化 

分 类 号：O643.32[理学—物理化学]