Synthesis High-Efficiency Photocatalyst for Degrading Organophosphorus Pesticide: Visible Light Driven Bi2S3 Based Nanocomposite

Global food demands are projected to double during the next 50 years. The use of pesticides in agriculture has enormously enhanced the food production by controlling numerous pests at various stages of crop production and storage, but at the same time, it has led to severe pollution of soil and groundwater[1].Parathion is a deep brown to yellow liquid with a faint odor of garlic. It is an organic phosphate pesticide which acts as an inhibitor of cholinesterase, and as such, it is highly toxic by all routes of exposure. It may be found as a liquid or as a dry mixture where the liquid is absorbed onto a dry carrier.A number of methods have been developed to remove the pollutants from the waters and wastewaters including adsorption, filtration, chemical oxidation and photocatalyst. Photocatalysis is a practical, low-cost method for organic pollutant degradation, water splitting, CO2 reduction and various organic reactions in milder conditions The degradation of parathion in water by KIT5/Bi2S3-Fe3O4 nanocomposite with photocatalytic processes under visible irradiation has been rarely studied for an effective technique for the removal of recalcitrant contaminants. Therefore, in the present study, we have investigated the photocatalytic degradation of parathion in aqueous solution with KIT5/Bi2S3-Fe3O4 composite under visible irradiation.The nanocomposites were characterized by Scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM).In this study some parameters were investigated such as time of visible irradiation, pH of medium, pesticide concentration and amount of nanocomposite. The results of the study revealed the photodegradation process of parathion by KIT5/Bi2S3-Fe3O4 composite was efficient.