Investigation of Photocatalytic Activities over Bi2WO6/ZnWO4 Composite under UV Light and Its Photoinduced Charge Transfer Properties

Bi2WO6/ZnWO4 composite photocatalysts have been successfully synthesized by a facile hydrothermal process. The catalysts were characterized by powder X-ray diffraction (XRD), transmission electron microcopy (TEM), and UV-vis diffuse reflectance spectrum (DRS). The results show that Bi2WO6 nanopartides grow on the primary ZnWO4 nanorods. The Bi2WO6/ZnWO4 composites have better UV light photocatalytic activities compared to single ZnWO4 nanorods. Furthermore, the photoinduced charge transfer properties of Bi2WO6/ZnWO4 composites were investigated by means of transient photovoltage (TPV) technique in detail. The interconnected interface of Bi2WO6/ZnWO4 composites led to the low recombination ratios of photoinduced electron hole pairs and enhanced photocatalytic activities.