▎ 摘　　要

The ZnO nanoparticles were coated with an appropriate amount of graphene oxide. The structure, surface morphology and Band gap of ZnO/graphene were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-vis absorption spectra. The effect of PH on the photocatalytic degradation of methyl orange using ZnO/graphene composites under visible light was studied. The research indicated that ZnO/graphene photocatalyst showed enhanced effect for the degradation of Methyl orange in pH= 3-5. Cycle degradation in different pH environment, and a cyclic degradation of recovered sample by scanning electron microscope showed that the presence of graphene has a protective effect on ZnO, which was able to inhibit the corrosion of ZnO in acidic environment, and improve the stability of its repeated degradation. As can be seen from photoluminescence spectroscopy experiments of ZnO /graphene and ZnO, the existence of graphene can effectively accelerate the separation efficiency of ZnO photogenerated electrons and holes, improving the photocatalytic degradation efficiency, which provides a theoretical basis for ZnO/graphene degrading dye wastewater in different pH especially in acidic environment.