邻-氯酚在TiO_2膜上光催化降解及反应动力学特征

Reaction Kinetics of Photocatalytic Degradation of 2-Chlorophenol on TiO_2 Film

以钛酸四丁酯为原料采用Sol Gel法制备了玻璃负载TiO2 膜光催化剂 ,应用XRD表征了不同实验条件下薄膜中TiO2 的晶相结构和粒度。分析了不同层数TiO2 膜的光催化活性和溶液 pH值对邻 氯酚 (2 CP)的影响。结果表明 :处理温度为 50 0℃时不同厚度薄膜中TiO2 均为锐钛矿晶型 ,粒径 8～ 33nm ,5层涂膜光催化活性最高。在高 pH值和低pH值区域 2 CP ,在TiO2 膜上的光催化降解速率较大。 2 CP初始浓度 (C0 )与反应速率 (r0 )的关系符合Langmuir Hinshelwood方程 ,当C0 ≤ 0 .6mmol·L- 1 时 ,降解反应可用一级动力学模式来描述。

This paper reports on the experiments of photocatalytic degradation of 2-chlorophenol in aqueous solution by using TiO 2/glass film. Preparation of the films and the characterization of crystal type and size of TiO 2 in the films by XRD are described. The results show the film coated with five layers of TiO 2 has relatively high catalytic activity, and the relationship between initial concentration of 2-chlorophenol and reaction rate follows Langmur-Hinshelwood equation.