超声协同TiO2光催化降解氯苯废水的研究  

Study on photodegradation of chlorbenzene catalyzed by coupling system of titanium dioxide and ultrasonic

作　　者：李凡修[1,2] 陆晓华[1] 梅平[2] 

机构地区：[1]华中科技大学环境科学研究所,湖北武汉430074 [2]长江大学化学与环境工程学院,湖北荆州434023

出　　处：《功能材料》2007年第A09期3340-3343,共4页Journal of Functional Materials

基　　金：国家高技术研究发展计划（863计划）资助项目（2002AA601300）

摘　　要：以钛酸丁酯为原料，采用超声法制备了纳米TiO2，以该TiO2作为光催化剂，对模拟氯苯废水进行超声光催化降解研究，考察了TiO2的加入量、氯苯的初始浓度、溶液pH值、过氧化氢的浓度等对氯苯降解率的影响。结果表明，pH值对氯苯的超声光催化影响较小，H2O2的浓度、氯苯的初始浓度影响较大。在TiO2质量浓度为200mg／L、氯苯质量浓度为110．6mg／L、pH为7．0、反应时间为90min的条件下，氯苯降解率可达92．94％。探讨了氯苯TiO2光催化降解的机理，氯苯超声光催化降解的中间产物主要是邻氯苯酚和间氯苯酚。Nanocrystalline TiO2 powders had been prepared through an easy ultrasonic method using tetrabutyl titanate as starting material. The sono-photocatalytic degradation of chlorbenzene （CB） solution was investigated using the TiO2 as photocatalyst. The effects of the dosage of TiO2, the initial concentration of CB, the concentration of H2O2 and the pH of the solution on the degradation of CB were tested. The results indicated the chlorobenzene underwent a fast photocatalysis In the process, the pH value of the dispersion had little effect on the photooxidation rate of CB catalyzed by TiO2, while the concentration of H2O2 and the initial concentration of CB affected it greatly. The degradation rate of CB is 92.94% when the mass concentration of TiO2 and CB is 200 and 110.6mg/L respectively, the pH is 7.0 and the irradiation time is 90min. The mechanism of photocatalytic degradation for chlorobenzene was also discussed. The intermediates of chlorobenzene are o-and p-chlorophenol.

关 键 词：超声 光催化降解 氯苯 光催化剂 降解机理 

分 类 号：X131.2[环境科学与工程—环境科学]