纳米TiO_2光催化降解毒死蜱的影响因素研究  

Study on influence factors of chlorpyrifos degradation using TiO_2

作　　者：刘祥英[1] 周小毛[1] 蔡海林[1] 曾爱平[1] 柏连阳[2] 

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

出　　处：《农药学学报》2011年第4期435-438,共4页Chinese Journal of Pesticide Science

基　　金：国家自然科学基金资助项目(21003042);湖南省重点科技资助项目(K0901015-21)

摘　　要：以高压汞灯为光源,采用高效液相色谱法研究了纳米T iO2光催化降解毒死蜱的影响因素。结果表明：纳米T iO2的最佳质量浓度为50-100mg/L;毒死蜱初始质量浓度影响其降解效果,相对较低的质量浓度（5-20mg/L）下初始浓度与降解率成正相关,相对较高质量浓度（20-80mg/L）下初始浓度与降解率成负相关;初始质量浓度为10mg/L时,毒死蜱的降解符合一级反应动力学方程;不同初始pH值的反应溶液经光催化反应后均表现为酸性,碱性条件有利于降解反应的进行。The influence factors of chlorpyrifos degradation using TiO2 through high-pressure mercury lamp were investigated.Concentrations of chlorpyrifos were determined with HPLC.The results showed that the concentration 50-100 mg/L TiO2 was the optimum.Significant positive correlation was found between lower concentrations 5-20 mg/L of chlorpyrifos and degradation rate,while negative correlation with higher concentrations of 20-80 mg/L.The degradation kinetics of 10 mg/L chlorpyrifos followed the first order reaction.Different pH decreased below pH 7 after photocatlytic reaction,and alkaline conditions chlorpyrifos was favorable to the degradation.

关 键 词：二氧化钛 光催化 降解 毒死蜱 

分 类 号：O657.72[理学—分析化学] O643.3[理学—化学]