Preparation,Characterization And Application Of Ag₃PO₄ Based Composite Photocatalytic Materials

With the development of industrialization,it has caused serious environmental pollution and energy shortages while the economy is booming.Semiconductor photocatalytic technology has become one of the hot research topics in the field of environmental management and new energy development because it has the advantages of fully utilizing solar energy to efficiently degrade organic pollutants,does not cause secondary pollution,and is easy to operate.Ag₃PO₄ has attracted the attention of researchers due to its high quantum efficiency,visible light response and high photocatalytic efficiency,and has broad application prospects.However,the optical properties of the monomer Ag₃PO₄ are unstable and the photo-generated electron-hole pairing rate is fast,which severely limits its photocatalytic efficiency.It is an effective means to solve this problem by studying a new stable and efficient Ag₃PO₄matrix composite.In this paper,Ag/Ag₃PO₄/WO₃ was prepared by deposition sedimentation and photoreduction method,and Ag₃PO₄/AgCl/g-C₃N₄ visible light composite photocatalytic materials were prepared by deposition sedimentation method and ion exchange method,which significantly improved the photocatalytic performance and recycle stability of pure Ag₃PO₄.XRD,SEM,XPS,UV-vis,PL and other characterization methods were used to analyze the relationship between the crystal structure and photocatalytic properties of the materials.At150 min,the degradation efficiency of Ag/Ag₃PO₄/WO₃ to phenol can reach98%,and after four cycles,the degradation rate can still maintain 60%activity;at 20 min,the degradation efficiency of Ag₃PO₄/AgCl/g-C₃N₄ is can reach94.8%,and after four cycles of use,the degradation rate can still maintain 80%activity.And the contribution rate of active species in the photocatalytic reaction process was investigated by quenching experiments.In the Ag/Ag₃PO₄/WO₃visible light system,photogenerated holes?h⁺?are the main active species in the photocatalytic degradation process.The contribution rate of H₂O₂ is second,and the contribution rate of e^-,·OH and·O₂^-is relatively small.In the Ag₃PO₄/AgCl/g-C₃N₄ visible light system,h⁺plays a major role in the degradation process,the contribution rate of H₂O₂ is second,and the contribution rates of e^-,·OH and·O₂^-are relatively small.Photocatalytic reaction mechanism of visible light composites for degradation of organic pollutants.Experiments show that Ag₃PO₄ based composite photocatalytic materials have good photocatalytic activity and optical stability,and have broad prospects in practical applications.