基于二甲胺(DMA)光催化降解的纳米TiO_2/硅藻土光催化剂的制备和表征  

Preparation and characterization of nano-TiO_2/diatomite photocatalyst for photocatalytic degradation of dimethylamine(DMA)

作　　者：宋雪斐[1] 胡勤海[1] 李霞[1] 陈菊芬 张荣臻[1] 萧晨霞 裴毓雯[1] 

机构地区：[1]浙江大学环境与资源学院,浙江杭州310058 [2]浙江玉环县环保局,浙江玉环317600

出　　处：《浙江大学学报（理学版）》2014年第5期553-557,572,共6页Journal of Zhejiang University（Science Edition）

基　　金：浙江大学、杭州金枫叶科技有限公司合作项目

摘　　要：以钛酸四丁酯为原料,通过溶胶-凝胶法制备纳米TiO2/硅藻土复合光催化剂,以难降解有机物二甲胺(DMA)为被降解物,考察了制备条件对光催化性能的影响.结果表明,TiO2/硅藻土光催化剂的制备最佳条件为水醇比0.6,500℃煅烧5h,硅藻土2g∶9mL负载1次,溶胶pH值为2.复合光催化剂经扫描电子显微镜(SME)和X射线衍射仪(XRD)表征,达到纳米级别,3g·L-1催化剂对400mg·L-1 DMA的6h降解率平均可达70%,光催化性能优良.The nano-TiO2/diatomite composite photocatalyst was prepared by sol-gel method. Refractory dimethylamine（DMA） was chosen as the model pollutant. The effects of various preparation conditions on photocatalytic activity were studied. Results showed that the optimum preparation conditions of TiO2/diatomite photocatalyst could be achieved by water/alcohol volume ratio of 0.6, calcination at 500 ℃ for 5 h, the rate of diatomite for 2 g ： 9 mL loaded once and pH 2. Characterization using SEM and XRD indicated that the sizes of composite photocatalysts were less than 100 nm. The average degradation efficiency for 400 mg·L^-1 DMA by 3 g·L^-1 photocatalyst was approximately 70% for 6 h.

关 键 词：二甲胺(DMA) 光催化 二氧化钛(TiO2) 硅藻土 溶胶一凝胶法 

分 类 号：X783.3[环境科学与工程—环境工程]