Photocatalytic Degradation Property Of Carbon Containing Composite Photocatalyst

Environmental issues are the difficult problems throughout the world, which are the negative effect of the industrial development. It is more urgent to discover highly efficient materials to control the environmental problems. Compound semiconductor photocatalysis technology employs the electrons and holes that generated from solar radiation to degrade the organic pollutant, which can be converted to water and carbon dioxide. Carbon material photocatalysts have the advantages of efficient environmental protection, low energy consumption, corrosion resistance. In this paper, the photocatalytic degradation of industrial wastewater by the composite of carbonaceous material with Ag₃PO₄ and bismuth oxyhalide compound has been studied.A series of CS/Ag₃PO₄ photocatalyst composites were synthesized by a simple precipitation method. The performance of the catalysts were characterized by X-ray powder diffraction?XRD?, transmission electron microscopy?TEM?, X-ray photoelectron spectroscopy?XPS?, UV-visible spectrophotometer ?UV-Vis?, scanning electron microscope?SEM?. The photocatalytic activity of Ag₃PO₄ and CS/Ag₃PO₄ was analyzed and evaluated by using methyl orange ?MO? with azo dye structure as the target dye. The impact of different concentrations of CS on the photocatalytic activity of CS/Ag₃PO₄ was also studied and the results showed that the best catalytic activity of CS/Ag₃PO₄ was presented when the concentrations of CS is 5 mg/L. The possible mechanism of CS/Ag₃PO₄ photocatalyst composite is the recombination of CS and Ag₃PO₄ effectively promoted the photoproduction of electrons and holes separation, which improve the photocatalytic activity of Ag₃PO₄. The hydroxyl free radical?·OH? is the main active species in the degradation process.The Ag₃PO₄ and C₆₀/Ag₃PO₄ were also synthesized by a simple precipitation method.The samples were investigated by X-ray diffraction ?XRD?, transmission electron microscopy ?TEM? and ultraviolet-visible absorption spectroscopy ?UV-vis?. The photocatalytic activity of Ag₃PO₄ and C₆₀/Ag₃PO₄ was systematically evaluated by using the azo dye methyl orange MO as the target reactant. The impact of different concentrations of C₆₀ on the photocatalytic activity of C₆₀/Ag₃PO₄ was also studied. The results showed that the best catalytic activity of C₆₀/Ag₃PO₄ was presented when the concentrations of C₆₀ is 5 mg/L. The enhanced photocatalytic activity could be mainly attributed to that the C₆₀ can effectively capture the photogenerated electrons to promote the separation of photo-induced electrons and holes,so as to improve the degradation efficiency and cycle stability of the catalyst.BiOCl/BiOBr composites were successfully prepared by microwave-assisted route.According to the results of XRD, SEM, UV-vis, the BiOCl/BiOBr shows the better photocatalytic activity of the rhodamine B ?RhB? solution under visible light irradiation.The possible mechanism of the photocatalytic degradation of BiOCl/BiOBr composite photocatalyst is that the BiOCl/BiOBr can separate the photogenerated electrons and holes better than the pure BiOCl and BiOBr, and finally improve the photocatalytic degradation efficiency of the composite photocatalyst.