▎ 摘　　要

A series of visible light-responsive plasmonic Ag coated BiOBr0.2I0.8 nanosheets are grown on graphene by a combined solvothermal and photodeposition method. The ternary Ag/BiOBr0.2I0.8/graphene nano composites exhibit significantly enhanced photocatalytic activity than pristine BiOBr0.2I0.8 and the binary BiOBr0.2I0.8/graphene composite. When the loading amount of Ag is 1.0 wt, the Ag/BiOBr0.2I0.8/graphene nanocomposite displays the highest photocatalytic activity. The rate constants for the ternary Ag/BiOBr0.2I0.8/graphene composite to degrade rhodamine B (RhB) and methylene blue (MB) are determined to be similar to 5.28 and 5.57 times as large as those of pristine BiOBr0.2I0.8, respectively. The high photocatalytic activity is attributed predominantly to the hybridization of the surface plasmonic resonance (SPR) effect of Ag nanoparticles and the specific electronics effect of graphene, thus enhancing the separation of photogenerated charge carriers of BiOBr0.2I0.8. Meanwhile, the excellent adsorption capacity of graphene and the broad absorption in the visible light region also contribute to the enhancement of photocatalytic activity. Both the holes and hydroxyl radicals were the active species in the degradation process. (C) 2016 Elsevier B.V. All rights reserved.