Preparation and photodegradation of acephate pesticide of visible light nano-sized TiO2 photocatalyst.

ZnFe2O4 and ZnFe2O4 doped TiO2 nanoparticles were prepared by coprecipitation and sol-gel methods respectively,characterized by means of XRD,TEM and UV-visDRS.Photodegradation of acephate pesticide in aqueous solution by nano-sized TiO2 process was studied,which was irradiated by a 500w halogen lamp.The effect of factors including initial pH value,catalyst dosage and concentration of H2O2 were investigated.Results showed that TiO2 nanoparticles which was baked under 400℃ and intermingled with 0.5% ZnFe2O4 had the best degradation effect,degradation efficiency of pesticide can be improved about 20% relative to pure TiO2 nanomaterials after 2h under the same conditions.Conditions that affect the degradation efficiency of organophosphorus pesticide were optimized by orthogonal experiment.In the optimal conditions with the initial pH 12,concentration of H2O2 12mmol/L and concentration of catalyst 0.5g/L,degradation rate of acephate pesticide with the initial concentration of 1.0×10-4mol/L can reach up to 61.2%.