BiOCl/Cu2O composites were successfully prepared by hydrothermal method,which is a good visible light responsive pho-tocatalyst.The BiOCl/Cu2O composites were characterized and analyzed by X-ray diffraction(XRD),scanning electron microscopy(SEM),ultraviolet-visible diffuse reflectance spectroscopy(UV-vis)and electrochemical impedance spectroscopy(EIS).Photocatalytic degradation experiments were carried out with acid orange(AO7)as the target pollutant to investigate the photocatalytic performance and degradation mechanism of BiOCl/Cu2O composites.The XRD results show that the diffraction intensity of BiOCl gradually in-creases with the increase of BiOCl content.SEM results show that BiOCl small nanosheets are attached to the relatively large octahedral Cu2O surface to form a composite structure.The results of UV-vis and EIS analyses show that the band gap of the composites is slightly increased compared to Cu2O but its impedance is significantly smaller.The results of the degradation experiments show that the visible photocatalytic degradation rate of BiOCl/Cu2O composites with a mass ratio of 3:5 at 90 min(56.8%)is significantly higher than that of Cu2O(26.3%),and its degradation rate constant(0.009 3 min-1)is 2.8 times higher than that of pure Cu2O(0.003 3 min-1).Free radical trapping experiments show that the active species playing a major role in the photocatalytic process of BiOCl/Cu2O composites is superoxide radicals(·O-2).The degradation rate of AO7 by the photocatalyst BiOCl/Cu2O(3:5)could still reach 48.3%after six cyclic degradation experiments.The heterogeneous structure formed by BiOCl and Cu2O reduces the surface transfer resistance to a certain extent,accelerates the transfer rate of photogenerated electrons in the photocatalytic process,improves the separation rate of photogenerated electrons and holes,and enhances the photocatalytic effect.
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维普
