科研之友
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摘要
Zinc acetate as a zinc source, sodium hydroxide solution as a precipitating agent, hexagonal short rod-shaped ZnO particles were sythesized by hydrothermal crystallization. Graphene oxide prepared by chemical oxidation as a modifier, different amounts of graphene oxide (GO) solution were added during the synthesis of zinc oxide. ZnO/GO composites were gained by the self-assembly of ZnO particles and GO sheets under hydrothermal condition. The phase composition, micro-morphology, functional group characteristics and optical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and ultraviolet-visible diffuse reflectance spectrum (DRS). The photocatalytic degradation activities of ZnO/GO composites with different GO contents for methylene blue (MB) were investigated under ultraviolet (UV) and visible light irradiation. The results show that the morphology of ZnO is hexagonal short rod-like, and the additive amount of GO has a significant influence on the morphology of sample. At the same time, GO can effectively promote the separation of photo-generated electrons and holes. As-prepared ZnO/GO composites have good degradation performance for MB under UV light irradiation. However, there is almost no photocatalytic activity under visible light, so it is inferred that the ratio of ZnO polarity surface to non-polar surface exposure has an important effect on the photoresponse range and photocatalytic performance of the composite sample.
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