TiO_2薄膜处理水中亚甲基蓝的动力学研究  

Kinetics Study on Methylene Blue in Water Treated by TiO_2 Film

作　　者：柳福提[1] 罗磊[2] 张淑华[3] 高曾辉[1] 

机构地区：[1]宜宾学院物理与电子工程系,四川宜宾644000 [2]湖南农业大学理学院,湖南长沙410128 [3]宜宾学院化学与化工系,四川宜宾644000

出　　处：《四川师范大学学报（自然科学版）》2010年第2期220-223,共4页Journal of Sichuan Normal University（Natural Science）

基　　金：四川省应用基础研究基金(07JY029-126)资助项目

摘　　要：采用溶胶-凝胶法制备了纳米TiO2薄膜,并通过XRD对催化剂进行了表征,在自制反应器中对亚甲基蓝进行了光催化降解反应实验.结果表明:TiO2的晶型为锐钛矿型,粒子平均半径为32.9 nm;在亚甲基蓝的初始浓度较低的条件下,初始浓度对光催化的影响基本上符合一级反应动力学模型,起始浓度较大时(>1.171×10-4mol/L),实际反应为零级反应,pH值和紫外光光照强度对反应也有明显的影响.The nanometer TiO2 thin film was prepared by sol-gel method,the structure and morphology of TiO2 thin film were characterized by XRD.Photocatalytic degradation experiments for methylene blue were carried out on the self-made photoreactor.The research shows that the crystal of TiO2 is anatase structure and the average particle diameter is 32.94 nm.The degradation rate of methylene blue follows the first-order reaction kinetics under low initial concentration conditions,while actual reaction conforms to zero-order reaction with higher initial concentration（1.171×10-4 mol/L）.Reactions are also influenced by pH and UV light intensity obviously.

关 键 词：光催化 反应动力学 亚甲基蓝 

分 类 号：O651[理学—分析化学]