Development of High Performance Graphene Oxide Modified Bi2WO6 Based Photocatalyst for Wastewater Treatment

摘要

Recently,Bi2WO6 photocatalyst has been a promising alternative for wastewater treatment due to its narrow bandgap,low cost,and visible-light-driven property.Nevertheless,the high recombination rate of the generated electron-hole pairs limited the efficiency of the Bi2WO6 photocatalyst.To solve this problem,Ag,Ag2O,and Ag3PO4 has been doped with Bi2WO6 to fabricate a novel heterogeneous photocatalyst with high photocatalytic performance [1].To further enhance the photocatalytic efficiency of Bi2WO6,graphene oxide(GO)is used to synthesize Bi2WO6 based composite photocatalyst.GO has been widely used as a light absorber and electron acceptor,which can reinforce light harvesting and electron-hole separation.Besides,the unique 2D structure of GO will promote the transfer of photo-generated charge carriers,which improves the photocatalytic activity [2].Ag/Ag2O/Ag3PO4/Bi2WO6 was synthesized by a two-step hydrothermal method,Bi2WO6 was formed in the first hydrothermal process,Ag,Ag2O,and Ag3PO4 were doped on Bi2WO6 in the second hydrothermal process.It is hypothesized that GO adding in different hydrothermal process will affect the crystal formation of Ag/Ag2O/Ag3PO4/Bi2WO6.Herein,GO adding in 1st and 2nd hydrothermal process of Ag/Ag2O/Ag3PO4/Bi2WO6 were synthesized separately to optimize its photocatalytic performance.