CeCO3OH-rGO(reduced graphene oxide)was prepared by a one-step hydrothermal method,and CeO2-rGO composites were prepared by roasting under argon(Ar)atmosphere.The phase composition,microstructure,vacancy defects,and photoelectrochemical properties of the composites were studied by X-ray diffraction,scanning electron microscopy,X-ray photoelectron spectroscopy,UV visible diffuse reflectance spectroscopy(UV-Vis DRS),etc.The photocatalytic performance of the composites with different GO(graphene oxide)and NH4HCO3 addition amounts respectively were comparatively studied.It was found that the CeO2-10rGO-15 with GO and NH4HCO3 addition amounts of 10 mg and 15 mmol respectively had the narrowest band-gap width(3.17 eV),and the photocat-alytic degradation ratio of methylene blue(MB)could reach 80.66％.It is beneficial to the formation vacancy defect of CeO2 and the separation of photogenic carriers for rGO loading suitably,thus promoting photocatalytic perfor-mance.
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