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Quinone-modified graphene powder is not reusable in bio-treatment systems,and the roles of quinone and graphene during extracellular electron-transfer processes remain unclear.In this study,anthraquinone-2-sulfonate and reduced graphene-oxide-modified polyurethane foam(AQS-rGO-PUF)was prepared.Our studies found that AQS-rGO-PUF exhibited higher catalytic performance on Acid Red 18(AR 18)bio-decolorization compared with AQS-PUF and rGO-PUF.