Photocatalytic degradation of imidacloprid by Ag-ZnO composite.

The present study focused on exploring the potential of Ag-ZnO composites for complete mineralization of imidacloprid with the aim to sustain the pollutant free safe water supply. The composites were prepared by hydrothermal method and characterized by Scanning electron microscope (SEM), Energy dispersive X-ray crystallography (EDX), X-ray diffraction (XRD) and band gap measurements. These composites were used to study the UV irradiated degradation of imidacloprid while optimizing the process parameters such as time of UV irradiation, pH of medium, pesticide concentration and composite loading. The results of the study revealed an increase in photodegradation of imidacloprid by Ag-ZnO composites than pure ZnO. Temperature and catalyst loading had a positive effect on degradation efficiency, while an inverse relation was observed between pesticide concentration and degradation. Moreover, no harmful degradation products of imidacloprid were observed in GC-MS analyses that confirmed its complete mineralization.