Graphene Oxide(GO),Iron Powder(Fe-Fe3O4)and lead dioxide(PbO2)are used to prepare poly-crystalline catalysts.Catalyst is effectively supported on the surface of conductive substrate based by the auxiliary of water-soluble paper(WSP).WSP polycrystalline catalytic composite membrane with high catalytic activity and high conductivity is prepared by phase inversion method.The prepared functional membrane is used as the cathode membrane electrode of the combined system of microbial fuel cell and membrane bioreactor(MFC-MBR),which is applied to carry out the study on the performance of enhanced electroreduction treatment of heavy metal wastewater containing copper/nickel.Compared with the control group,the experimental results show that WSP polycrystalline catalytic composite membrane has the characteristics of low reduction potential and low ohmic resistance(reduction potential and internal resistance only 0.12 V and 1.38 Ω).Morphological characterization illustrates that the cata-lyst loaded on the membrane surface is uniform,and the highly active catalytic interface is conducive to the elec-troreduction of heavy metals.WSP polycrystalline catalytic composite membrane assists MFC-MBR to carry out wastewater treatment.The removal efficiency of Cu(Ⅱ)is higher than 90％and that of Ni(Ⅱ)is more than 99％.The simultaneous removal efficiencies of Cu(Ⅱ)and Ni(Ⅱ)in copper/nickel mixed wastewater are 97.63％and 93.18％respectively.The research results indicate that,applying WSP polycrystalline catalytic com-posite membrane assisted MFC-MBR coupling system to treat heavy metal wastewater can achieve significant advan-tages,such as high removal efficiency of characteristic pollutants and low operating costs,and has broad engineer-ing application prospects.
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