UV-TiO_2/硅藻土光催化降解DMF的影响因素分析  

Influential factors for photocatalytic degradation of DMF based on UV-TiO_2/diatomite composite catalyst

作　　者：张帆[1] 杜建康[1] 王志良[2] 赵珊珊[2] 张林生[1] 

机构地区：[1]东南大学能源与环境学院,南京210096 [2]江苏省环境科学研究院江苏省环境工程重点实验室,南京210036

出　　处：《东南大学学报（自然科学版）》2010年第2期393-396,共4页Journal of Southeast University：Natural Science Edition

基　　金：国家科技重大专项资助项目(2008ZX07421-006)

摘　　要：为探讨废水中DMF光催化氧化的降解规律,采用溶胶-凝胶法水解钛酸四丁酯制备硅藻土负载TiO2复合光催化剂.以DMF溶液的光催化降解为模型反应,研究了初始质量浓度、催化剂质量浓度、pH值、光强、外加双氧水等因素对DMF去除效果的影响.结果表明：随初始质量浓度增加,光强增大,H2O2用量增加,去除率提高;去除DMF的最佳催化剂质量浓度为2-4g/L,pH为5.36;在初始质量浓度为200mg/L、紫外灯功率为300W时,最大去除率达89.3%.设计正交实验确定了各因素对光催化降解DMF反应影响的重要性为：光照时间〉初始质量浓度〉光照强度〉H2O2浓度〉催化剂质量浓度.In order to ascertain the rules of photocatalytic degradation of N, N-dimethylformamide, the composite catalyst was prepared by sol-gel method using diatomite as active additional substance. Being a model reaction by degradation of N,N-dimethylformamide aqueous solution, the impacts of initial concentration, photocatalyst amount, initial pH, light intensity, HiO： concentration effect were investigated. The results show that degradation rate increases with the rise of initial concentration and light intensity. The best photocatalyst amount is 2 to 4 g/L and initial pH is 5.36. When the initial concentration is 200 mg/L, the light power is 300 W, the photodegradation rate is up to 89. 3 %. The orthogonal experiment results show the influence sequence of different factors, namely, illumination time 〉 the initial concentration 〉 light intensity 〉 H2O2 concentration 〉 photocatalyst amount.

关 键 词：二甲基甲酰胺 光催化 TIO2 硅藻土 

分 类 号：X703.1[环境科学与工程—环境工程]