TiO_2/SiO_2:Zn复合薄膜及其光催化活性研究  

Study on the TiO_2/SiO_2:Zn Composite Films and Their Photocatalytic Activity

作　　者：董抒华[1] 刘俊成[1] 

机构地区：[1]山东理工大学材料科学与工程学院,山东淄博255049

出　　处：《信阳师范学院学报（自然科学版）》2009年第1期88-91,共4页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(50372036)

摘　　要：采用溶胶-凝胶法(Sol-Gel)成功制备了Zn掺杂的TiO2/SiO2薄膜.采用XRD、UV-vis和SEM等方法对TiO2/SiO2薄膜及Zn掺杂TiO2/SiO2薄膜的结构和微观形貌进行了测试与表征,并对亚甲基蓝的光催化降解进行了研究.结果表明:TiO2/SiO2∶Zn前驱体经500℃煅烧1 h可得到锐钛矿型氧化钛复合薄膜,薄膜平滑、致密、均匀.Zn2+进入TiO2晶格中形成置换固溶体,并引起晶格畸变.掺杂锌后,TiO2/SiO2光吸收带边发生明显红移.Zn最佳掺杂量为1.5%(摩尔比),这时所形成的Zn2+-TiO2/SiO2光催化剂经150 min光照射后光降解率可达83.7%,比纯TiO2/SiO2作为光催化剂提高了31%.Zn doped TiO2/SiO2 thin films were prepared successfully by sol-gel method. To obtain structure properties and micro-topography, these films were characterized by XRD, UV-vis and SEM. The photoeatalytic activities of these thin films in the methylene blue were studied. The results show that the titanium dioxide composite films of the anatase phase can be obtained when the Zn^2＋ -TiO2/SiO2 precursors are heated at 500℃ for lb. The films are smooth, compact and uniform. The zinc ions enter the TiO2 crystal lattice to form the substitution solid solution. As a restdt, distortion of lattice is caused. The photoabsorption edges have obvious red shift after doping Zn. Zn optimum doping amount is 1.5% and the photodegradation rate of 1.5% Zn^2＋ -TiO2/SiO2 on methylene blue reaches 83.7% during 150 min light irradiation, which is increased by 31% than that without Zn^2＋ doping.

关 键 词：溶胶-凝胶法 光催化 TiO2/SiO2薄膜 Zn2+掺杂 

分 类 号：O643[理学—物理化学]