The Preparation And Characterization Of Novel Ag-based Composite Photocatalyst And The Study Of Visible Light Degradation Performance

With the advent of the second industrial revolution,human economic construction has been unprecedentedly prosperous.But it followed by a serious environmental pollution and energy shortage.Photocatalytic technology can directly utilize solar energy to efficiently degrade organic pollutants at room temperature,it is a highly potential environmental pollution technology.The research on the preparation of more efficient photocatalyst and the exploration of more advanced photocatalytic technology has become one of the most popular scientific research projects at the moment.The nover semiconductor Ag₃PO₄ photocatalytic material has a narrow band width can respond to a wide range of visible light,strong oxidizing ability,the full degradation of organic pollutants can be achieved by using sunlight in a very short period of time,thus attracting the attention of researchers.However,Ag₃PO₄is easily degraded by light,which can not be reused for many times due to its poor stability,which greatly limits its application in actual production.Recently,It is found that the photocatalyst with Ag₃PO₄ can high-efficiency degrade organic pollutants and maintain good stability.In this work,firstly,we obtain the Ag₃PO₄via a ion exchange method,then,the nover composite photocatalyst was successfully fabricated through a deposition-precipitation method,in which the Ag Cl nanoparticle coated on the surface of Ag₃PO₄.The following,the effects of Ag₃PO₄/Ag Cl and reduced oxidized graphene composite on photocatalytic activity and stability of material were studied.The ternary materials are obtained through a deposition-precipitation method,in which the Ag₃PO₄/AgCl successfully coated on the surface of rGO.The experimental results show that these composite photocatalyst have terrific photocatalytic activity and photocatalytic stability,the degradation rate of pollutants were increased,especially.Hence,in this thesis,based on the new-type Ag₃PO₄ photocatalyst,the two kinds of composite photocatalytic material that can respond to visible light,such as Ag₃PO₄/AgCl,Ag₃PO₄/AgCl/rGO were successfully prepared in order to effectively improve the photocatalytic activity and stability of the single material.The degradation of parabens by the as-prepared composite mater were terrific.And studied the relationship between microstructure and photocatalytic activity of materials by X-ray diffraction?XRD?,scanning electron microscope?SEM?,ultraviolet visible diffuse reflectance spectra?Uv-vis?,photoluminescence spectra?PL?and so on,discussed its photocatalytic mechanism.It proves the as-prepared Ag nanometer photocatalytic material possess excellent photocatalytic activity and photocatalytic stability,It can successfully complete the task of degrading organic pollutants in water environment and has the actual extensive use value.