纳米TiO2 光催化降解毒死蜱的影响因素研究

Study on influence factors of chlorpyrifos degradation using TiO2

摘要: 以高压汞灯为光源,采用高效液相色谱法研究了纳米TiO2光催化降解毒死蜱的影响因素。结果表明:纳米TiO2的最佳质量浓度为50～100 mg/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(5～20 mg/L)下初始浓度与降解率成正相关,相对较高质量浓度(20～80 mg/L)下初始浓度与降解率成负相关;初始质量浓度为10 mg/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。

Abstract: 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.