附载TiO_2光催化降解咪蚜胺农药  

Photocatalytic Degradation of Pesticide Imidacloprid Using Adherent TiO 2 Catalysts

作　　者：郑巍[1] 刘维屏[1] 宣日成[1] 卢建杭[1] 

机构地区：[1]浙江大学化学系

出　　处：《环境科学》1999年第1期73-76,共4页Environmental Science

基　　金：国家自然科学基金

摘　　要：以主波长３６５ｎｍ的黑炽荧光灯为光源，研究了由ＣＭＣ－Ｎａ附载ＴｉＯ２光催化降解咪蚜胺农药的过程。结果表明，咪蚜胺农药在３×８Ｗ黑炽荧光灯照射下，经附载ＴｉＯ２作用３ｈ后可降解５０％以上，其光解可用假一级动力学方程表示。对于加ＣＭＣ－Ｎａ附载的ＴｉＯ２玻板，ＴｉＯ２不易脱落，经多次使用其光催化活性不变，而直接附载的ＴｉＯ２却有流失现象发生。另外，初探了以自然光为光源催化降解咪蚜胺农药的可行性。TiO 2 catalysts adhered to the glass were used for investigating photocatalytic degradation of pesticide imidacloprid in aqueous solution under 3×8W fluorescent lamps.The results showed that the photocatalytic degradation rate of imidacloprid was high and up to above 50%.And the photolysis fit a first order kinetic relationship well.The photolysis rate constant of imidacloprid decreased with increasing initial concentration,which was explained by two mechanisms of photocatalytic degradation.By contrast,adherent TiO 2 films with adding Carboxymethyl Cellulose Na to treat was not easy to take off and the catalytic activity would not drop.In addition,the feasibility the imidacloprid photocatalytic degradation under the sunlight was also studied.

关 键 词：光催化 咪蚜胺 降解 二氧化钛 废水处理 农药 

分 类 号：X789.03[环境科学与工程—环境工程]