Abstract:

The photocatlytic degradation of chlorpyrifos using TiO2 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, TiO2 dosage, the initial concentration of chlorpyrifos and pH value which affected the degradation was investigated. The results showed that the concentration 50 mg/L TiO2 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.