热处理温度对TiO2光催化膜性能的影响  

Influence of Heat Treatment Temperature on Characteristics of TiO_2 Film Photocatalyst

作　　者：仇雁翎[1] 赵建夫[2] 李田[2] 朱志良[2] 

机构地区：[1]同济大学长江水环境教育部重点实验室,上海200092 [2]同济大学污染控制与资源化研究国家重点实验室,上海200092

出　　处：《同济大学学报（自然科学版）》2008年第6期764-768,共5页Journal of Tongji University:Natural Science

基　　金：国家“八六三”高技术研究发展计划资助项目(2002AA601250)

摘　　要：用溶胶凝胶法在玻璃纤维网上制备TiO2膜,采用热重仪/差式扫描量热仪(TG/DSC)、负载量测定、X射线仪(XRD)、扫描电子显微镜(SEM)等手段,较为系统地描述了不同热处理温度条件下膜的形貌特点和结构特征;以光催化降解水中苯酚作为探针反应,考察了热处理温度对催化剂降解活性的影响.结果表明,在所采用的焙烧温度范围(350,400,450,500℃),500℃时锐钛矿TiO2的含量达到最高,晶粒达到最大.随热处理温度的升高,膜催化剂的单层负载量逐渐增大,膜催化剂降解水中苯酚的能力逐渐提高.当苯酚初始质量浓度为2 mg.L-1,反应2 h,4个焙烧温度条件下制得的TiO2膜催化剂对苯酚的去除率都可达90%以上.Development of immobilized TiO2 photocatalyst has become highlight of relevant study in order to facilitate the photocatalytic technology into practical water treatment application. Sol-gel method was used to prepare TiO2 film on fiberglass net. The morphology and structure of the TiO2 film catalysts under different heat treatment temperatures were systematicaly investigated by thermal gravimeter/differential scanning calorimeter （TG/DSC）, TiO2 loading measurement, X-ray diffractometer （XRD）, scanning electron microscopy（SEM） and so on. The photocatalytic efficiencies of the catalysts made under different heat treatment temperatures were evaluated by the degradation of phenol in solution. Results show that the anatase reaches the highest content and the biggest size for crystalline grain at 500℃ out of the adopted four calcination temperature （namely 350,400,450 and 500℃）. In company with the increasing heat treatment temperature,the monolayer loading amount of TiO2 film gets higher and its photocatalytic degradation ability of phenol in solution was improved. Under the conditions of 2 mg·L^-1 of initial phenol concentration and 2 h of reaction time,the phenol removal efficiency are all over 90% for catalysts made with four different calcination temperatures.

关 键 词：水处理 TIO2膜 热处理温度 光催化降解活性 溶胶凝胶法 

分 类 号：X505[环境科学与工程—环境工程]