太阳光下TiO_2光催化降解毒死蜱的动力学研究

Kinetics Study on the Degradation of Chlorpyrifos Using TiO_2 under Sunlight Irradiation

笔者以太阳光为光源,研究了纳米TiO2降解毒死蜱的反应动力学,考察了纳米TiO2用量、毒死蜱起始浓度及溶液pH值对毒死蜱光催化降解速率的影响,旨在为将来实际生产中降解蔬菜、粮食、水果及农药废水中毒死蜱残留的污染提供依据。结果表明,TiO2最佳用量为50mg/L;毒死蜱初始浓度越大,降解速率常数越小;在碱性条件下,有利于降解反应的进行。试验条件下毒死蜱的光催化降解符合一级反应动力学规律。

The photocatlytic degradation of chlorpyrifos using TiO 2 under sunlight irradiation will provide theoretical reference for the degradation of organophosphorus pesticide in the fruits,vegetables production and pesticides wastewater in the future.Here,TiO 2 dosage,the initial concentration of chlorpyrifos and pH value which affected the degradation were investigated.The results showed that the concentration 50 mg/L TiO 2 was the optimum,the higher initial concentration of chlorpyrifos,the smaller the degradation rate constant relatively,and under the alkaline conditions chlorpyrifos was favorable to the degradation.The kinetics for degradation of chlorpyrifos followed the first order reaction.