作　　者： ; ; ; ;

机构地区： 广东工业大学轻工化工学院

出　　处： 《工业水处理》 2005年第12期24-26,共3页

摘　　要： 采用溶胶—凝胶法制备石墨负载TiO2薄膜电极,以125W高压汞灯为光源,以负载TiO2薄膜的石墨片为工作电极,铂电极为对电极,饱和甘汞电极为参比电极,建立三电极的光电催化体系,以甲基橙为降解对象,考察了初始浓度、涂敷层数、外加电压、通入空气对甲基橙降解速率的影响。研究表明,石墨是光催化剂良好的载体,外加电压可以促进光催化降解的效率,外加电压2V、涂敷3层、通入空气时对目标物质的降解效果最好。 TiO2 deposited on graphite thin films is prepared by sol-gel method, Using the TiO2 electrode as working electrode, the photoelectrocatalytic（PEC） system is set up. Applying this system, the degradation of methyl orange in aqueous solution is investigated in terms of decolorization. The key factors affecting the PEC oxidation efficiency are studied, including the initial concentration of methyl orange solution, electrode potential, the number of coating layers and airflow. It is found that an optimal bias voltage of 2.0 V, 3 coating layers and airflow are favourable for the removal of methyl orange in aqueous solution. Our investigation shows that graphite is a good carrier, and PEC oxidation is a convenient way to mineralize the organic pollutants with high efficiency.

关 键 词： 光催化 光电催化 二氧化钛 薄膜电极

领　　域： [环境科学与工程] [环境科学与工程]