TiO2/MCM-41的制备及光催化脱色性能研究  

Preparation and Photocatalytic Activities of TiO_2/MCM-41 Photocatalyst

作　　者：窦琳[1] 李建章[1] 钟俊波[1] 王涛[1] 程朝柱 陈久福[1] 李敏娇[2] 

机构地区：[1]绿色催化四川省高校重点实验室,四川理工学院化学与制药工程学院,四川自贡643000 [2]四川理工学院材料与化学工程学院,四川自贡643000

出　　处：《钢铁钒钛》2015年第2期24-27,32,共5页Iron Steel Vanadium Titanium

基　　金：四川理工学院校级科研基金(No.2012KY11);绿色催化四川省高校重点实验室开放课题(LYJ14203,LZJ1301);四川理工学院研究生创新基金项目(Y2013025);四川理工学院学科建设项目基金资助

摘　　要：用溶胶-凝胶法制备了不同TiO2含量的TiO2/MCM-41光催化剂,以罗丹明B为模拟有机污染物,对催化剂的光催化脱色性能进行了考察。用XRD、UV-Vis漫反射、N2吸附等方法对光催化剂进行了表征,结果表明:TiO2/MCM-41的比表面积和孔体积随TiO2含量的增加而减小,TiO2/MCM-41负载型催化剂上TiO2平均晶粒尺寸比纯TiO2的小。20%TiO2/MCM-41的光生电子-空穴分离效应最高,且光催化脱色活性最高。光催化反应体系中h+是主要的活性自由基,TiO2/MCM-41的光催化活性由材料的吸附能力和所含TiO2的光催化性能共同决定。TiO2/MCM-41 photocatalysts with different titania content were prepared by loading titania onto the mesopores of MCM-41 molecular sieves via a sol-gel method. The photocatalytic activities of TiO2/MCM -41 photocatalysts were evaluated by the photocatalytie degradation of Rhodamine B aqueous solution. TiO2/ MCM-41 photocatalysts were characterized by X-ray diffraction （XRD）,UV-Vis diffuse reflectance spectroscopy and N2 adsorption techniques. The results indicate that both the BET surface area and pore volume of TiO2/MCM-41 photocatalyst decrease with the increase in content of loaded titania. The average crystal size of titania loaded on TiO2/MCM-41 is smaller than that of pure titania nanoparticles. 20% TiO2/MCM-41 photocatalyst has the highest photo-induced charge separation efficiency. Among all the photocatalysts, the 20% TiO2/MCM-41 sample possesses the best photocatalytic activity. The h＋ is main active species during the photocatalytic process. The photocatalytic activities of the TiO2/MCM-41 photocatalyst depend on their adsorption abilities and the activity of titania loaded onto the MCM-41 molecular sieves.

关 键 词：TIO2 MCM-41 光催化脱色 自由基 

分 类 号：O643.36[理学—物理化学]