Preparation and Photocatalytic Properties of Loaded CoS2/Bi2WO6
Jiangsu Province Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
Abstract A novel visible-light-responsive heterojunction bismuth tungstate (CoS2/Bi2WO6) composite photocatalyst was synthesized from bismuth tungstate (Bi2WO6) and metal sulfide (CoS2) by a hydrothermal method. The structure and properties of the prepared photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Brunaue-Emmett-Teller (BET), photoluminescence (PL) and ultraviolet-visible light diffusion (UV-DRS). The results showed that CoS2 was successfully loaded on the surface of Bi2WO6 to form CoS2/Bi2WO6 heterojunction, which promoted the separation of photo-generated electrons and holes, expanded the light absorption range, and improved the photocatalytic activity of the composite catalyst under visible light. The CoS2/Bi2WO6-0.3% sample showed the best catalytic activity and the degradation ratio of MB reached 97.71% within 180 min under visible light, which indicated that CoS2/Bi2WO6 composite material was a new type of photocatalyst with high catalytic efficiency.
