Abstract: A serious of ZnWO4-ZnO composite photocatalysts with various ZnWO4 concentrations were prepared by calcined mixed ZnO and WO3 powder at different temperature.The photocatalysts were characterized by X-ray diffraction, scan electron microscopy and energy dispersive X-ray spectroscopy.The photocatalytic activity of the samples was evaluated by photocatalytic degradation of Rhodamine B under UV light irradiation.The results show that the photocatalytic activity of the ZnWO4-ZnO composite catalyst is depend on the calcination temperature and the molar ratio of ZnWO4 to ZnO.The ZnWO4-ZnO composite photocatalyst with 4mol; concentration of ZnWO4 show the highest degradation rate.The high efficiency of the ZnWO4-ZnO composites is explain by the improved charge separation of the photogenerated electron-hole pairs.

Key words: A serious of ZnWO4-ZnO composite photocatalysts with various ZnWO4 concentrations were prepared by calcined mixed ZnO and WO3 powder at different temperature.The photocatalysts were characterized by X-ray diffraction, scan electron microscopy and energy dispersive X-ray spectroscopy.The photocatalytic activity of the samples was evaluated by photocatalytic degradation of Rhodamine B under UV light irradiation.The results show that the photocatalytic activity of the ZnWO4-ZnO composite catalyst is depend on the calcination temperature and the molar ratio of ZnWO4 to ZnO.The ZnWO4-ZnO composite photocatalyst with 4mol; concentration of ZnWO4 show the highest degradation rate.The high efficiency of the ZnWO4-ZnO composites is explain by the improved charge separation of the photogenerated electron-hole pairs.