纳米二氧化钛光催化降解毒死蜱的动力学研究  

Kinetic study on the photocatalytic degradation of chlorpyrifos by nanometer titanium dioxide

作　　者：刘祥英[1] 李琼轩[1] 柏连阳[1,2] 

机构地区：[1]湖南农业大学生物安全科学技术学院,湖南长沙410128 [2]湖南人文科技学院农科所,湖南娄底417000

出　　处：《湖南农业大学学报（自然科学版）》2011年第5期551-553,共3页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：国家自然科学基金项目(21003042);长沙市科技局重点项目(K0901015-21)

摘　　要：以高压汞灯为光源,研究纳米二氧化钛(TiO2)降解毒死蜱的反应动力学,考察纳米TiO2用量、毒死蜱起始质量浓度及溶液pH值对毒死蜱光催化降解速率的影响。结果表明,纳米TiO2最佳用量为50～100 mg/L,毒死蜱初始质量浓度在5～80 mg/L时,其降解反应符合一级反应动力学规律,表现为毒死蜱质量浓度越大,降解速率常数越小,半衰期越长,毒死蜱质量浓度为80 mg/L的半衰期为27.18 min,比质量浓度5 mg/L时的长1.5倍;碱性条件有利于毒死蜱的降解。The photocatlytic degradation of chlorpyrifos using TiO2 through high-pressure mercury lamp has been investigated. The results showed that the optimum concentration range for TiO2 was 50-100 mg/L. When initial concentration of chlorpyrifos was at the range of 5-80 mg/L, the kinetics for degradation followed the first order reaction in which the bigger the initial concentration, the smaller the degradation constant and the longer the half-life. The half-life of 80 mg/L chlorpyrifos was 27.18 min, 1.5 times longer than that of the 5 mg/L chlorpyrifos, chlorpyrifos and alkaline condition was more favorable for degradation of chlorpyrifos.

关 键 词：毒死蜱 光催化 纳米二氧化钛 动力学 

分 类 号：X592[环境科学与工程—环境工程]