中文摘要：

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Ti02最佳用量为50～100mg／L，毒死蜱初始质量浓度在5—80mg／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80mg／L的半衰期为27．18min，比质量浓度5mg／L时的长1．5倍；碱性条件有利于毒死蜱的降解。

英文摘要：

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.