负载型纳米TiO_2光催化剂的制备及其降解水中微量间二甲苯的研究  

Study on Preparation of Immobilized Nanometer TiO_2 Photo-catalyst and Its Photo-degradation for Soluble m-Xylene in Water

作　　者：李继洲[1] 王郁[2] 

机构地区：[1]河海大学环境科学与工程学院,南京210098 [2]华东理工大学资源与环境工程学院,上海200237

出　　处：《四川环境》2004年第1期5-7,10,共4页Sichuan Environment

基　　金：国家自然科学基金资助项目(2987707)

摘　　要：采用浸涂-烧结法制备的纳米TiO2光催化剂负载量约为6mg/g载体,催化剂经5次重复使用其催化效果稳定,表明催化剂表面TiO2粉体负载牢固;以高压汞灯为光源,对水中微量间二甲苯的负载型纳米TiO2光催化氧化过程的研究表明:初始浓度在6 68～17 36mg/L的范围内,间二甲苯的光催化反应遵循表观一级反应动力学规律,反应的表观速率常数随溶液初始浓度的增大而减小,半衰期则随初始浓度的增大而增加。Immobilized nanometer TiO_2 photocatalyst was prepared by dipping-sintering process,and the loading amount was about 6mg per gram carrier. The removal efficiency for m-xylene in water kept stable during 5 times of reusing the photocatalyst.This shows TiO_2 paticles loaded firmly on the carrier. Under illumination by high-pressure Hg lamp and catalyzed by TiO_2, it was shown that this reaction was conformity with the first order kinetics law in appearance. From 6.68 to 17.36 mg/L of initial concentration of m-xylene in water, the apparent rate constant of the reaction decreased with the increase of initial concentration, and half-life period of the reaction increased as initial concentration,of m-xylene in water increased.

关 键 词：负载型纳米TIO2 光催化氧化 间二甲苯 

分 类 号：X703[环境科学与工程—环境工程]