Preparation And Visible Light Photocatalytic Performance Of Modified Ag₃PO₄ Photocatalysts

Ag₃PO₄ is a new and highly efficient visible-light photocatalyst with a high quantum yield and good photocatalytic performance.However,pure Ag₃PO₄ is slightly soluble in water,and vulnerable to photochemical etching,which limit its application in the field of environmental pollution control.In order to further improve the photocatalytic performance and stability of Ag₃PO₄,it was modified through the morphology controlling,composite and ion doping methods in the article.Rhodamine B?RhB?was selected as a target pollutant,the photocatalytic performance and stability of modified Ag₃PO₄ photocatalyst were evaluated under visible light irradiation,and its photocatalytic mechanism was explored.Ag₃PO₄ photocatalyst was prepared by chemical precipitation method with the addition of DMF and urea.The Ag₃PO₄ samples were characterized by XRD,FTIR,SEM,laser particle size instrument and UV-Vis.The results showed that the Ag₃PO₄ prepared by DMF and urea with high purity was well-crystallized,rhombic dodecahedron and had strong absorption to visible light.Under visible light irradiation,,the photocatalytic degradation efficiency of RhB over the Ag₃PO₄ prepared by DMF and urea was better than Ag₃PO₄ prepared by single material and irregular Ag₃PO₄,and its stability was also improved.Therefore,the synthesis with the assistance of DMF and urea is a kind of the effective ways to improve the photocatalytic performance and stability of Ag₃PO₄.The Ag₃PO₄-AgBr-PTh-SiO₂ composite photocatalyst was prepared by chemical precipitation method with the assistance of CTAB as surfactant.The photocatalysts were analyzed by XRD,FTIR,SEM,XPS,UV-Vis characterization methods.The results showed that Ag₃PO₄-AgBr-PTh-SiO₂ composite photocatalyst had been successfully synthesized with enhanced visible light absorption.Under visible light irradiation,when the mass of PTh was 0.0034 g,the Ag₃PO₄-AgBr-PTh-SiO₂ composite photocatalyst had the best degradation efficiency of RhB.Therefore,PTh play a key role for the improvement of photocatalytic performance and stability in Ag₃PO₄-AgBr-PTh-SiO₂ composite.The Bi-Ag₃PO₄-MIL-100?Fe?composite photocatalyst was prepared by a simple method.The photocatalysts were characterized by XRD,FTIR,SEM,XPS,UV-Vis and PL.The results showed that the Bi-Ag₃PO₄-MIL-100?Fe?composite photocatalyst had been successfully synthesized with enhanced visible light absorption.Under visible light irradiation,the photocatalytic degradation efficiency of RhB over the Bi-Ag₃PO₄-MIL-100?Fe?composite photocatalyst was better than Bi-Ag₃PO₄ photocatalyst and Ag₃PO₄-MIL-100?Fe?photocatalyst,and its stability was obviously improved.Therefore,Bi3+ doping and MIL-100?Fe?compound are of great significance to strengthening the photocatalytic performance and stability of Ag₃PO₄.