Using amino-functionalized Fe3O4-WO3 nanoparticles for diazinon removal from synthetic and real water samples in presence of UV irradiation

Abstract In this research, photocatalytic degradation of diazinon by amino-functionalized Fe3O4-WO3 nanoparticles under UV irradiation was investigated with variation of pH, nanocatalyst dose, initial diazinon concentration, different purging gases, H2O2 concentration, and type of organic compounds. Under optimal conditions: pH= 7, [Diazinon]0= 20 mg.L–1, nanocatalyst dosage= 0.25 g.L–1, H2O2= 5 mM, 99.23 % of the insecticide was removed after 120 min. A decrease was observed in the removal efficiency of diazinon in the presence of different purging gases and organic compounds. Based on the three kinetic models developed in this study, it was found that the removal of diazinon followed the first order kinetic. Also, application of the UV/amino-functionalized Fe3O4-WO3 nanoparticles both increased the performance and decreased electric power consumption. However, 86.17 % of diazinon in real water samples was removed under the optimized conditions. Furthermore, the photocatalytic activity was kept after five successive cycles.