▎ 摘　　要

Currently, graphene and its functional derivatives are in high demand due to their unprecedented potential to build multifunctional catalysts. Here, we report the synthesis of highly active and cheap photo-catalyst materials consisting of sol-gel synthesized ZnO nanochips, assembled over the oxidized (GO) and partially reduced (RGO) derivatives of graphene in presence of ultrasound radiations. Structure, crystallite size, morphology, optical and photo-catalytic properties of as synthesized ZnO nanochips, ZnO@GO, and ZnO@RGO nanocomposites were investigated. Results demonstrated that ZnO nanochips incorporated over graphene sheets showed higher photo-catalytic rates with similar to 76.5-98.9% degradation of Rhodamine-B (RhB) and Methylene Blue (MB) within 90 min of visible light irradiation. Moreover, ZnO@RGO was more efficient photo-catalyst than ZnO@GO with similar to 2.4 and similar to 2 times higher kinetic rates for the removal of RhB and MB, respectively. The superior performance of ZnO@RGO was ascribed to partially restored conjugated structure of RGO that dispense higher charge density on surface of photo-catalyst per unit time, by more effective charge migration and separation across semiconductor-caron (S-C) heterojunctions. The active species involved in degradation process were systematically investigated and a photo-catalytic mechanism was proposed. In addition, ZnO@GO and ZnO@RGO showed good recyclability and resistance to photo-corrosion even after 360 minutes of consecutive photo-catalytic activity.