Improving Photocatalytic Performance from Bi2WO6@MoS2/graphene Hybrids via Gradual Charge Transferred Pathway

The charge transfer from the main catalyst to the cocatalyst is a key factor to enhance catalytic activity for photocatalytic nanocomposite materials. In order to enhance the charge transfer between Bi 2 WO 6 and graphene, we inlet MoS 2 as a “stepping-stone” into Bi 2 WO 6 and graphene. Here, we report an effective strategy to synthesize ternary Bi 2 WO 6 @MoS 2 /graphene nanocomposite photocatalyst by a facile two-step hydrothermal method, which is afforded by assembling two cocatalysts, graphene and MoS 2 , into the Bi 2 WO 6 matrix with a nanoparticle morphology as a visible light harvester. Compared with Bi 2 WO 6 /graphene, Bi 2 WO 6 /MoS 2 and pure Bi 2 WO 6 , the Bi 2 WO 6 @MoS 2 /graphene ternary composites exhibit superior photocatalytic activity owing to an enhanced charge carrier separation via gradual charge transferred pathway. This work indicates a promising cocatalyst strategy for designing a more efficient graphene based semiconductor photocatalyst toward degradation of organic pollutants.