Synthesis And Photaocatalytic Perperites Of Ag/AgCl/Perovskite Titanates

With the rapid development of the global industrialization process,the global energy and environmental problems are becoming more and more serious.Environmental protection has become an important issue which affecting human survival and development.Photocatalytic technology is a kind of high-tech which can effectively utilize solar energy to remove pollutants and decompose aquatic hydrogen.It has high degradation efficiency,low cost and environment-friendly characteristics,and its application prospect is extremely broad.CaTiO3 and BaTiO3 have attracted much attention because of their good optical properties and special electronic structures.However,the wide band gap of CaTiO3 and BaTiO3 let them only response to ultraviolet light,limiting its application in practice.Therefore,it's significant to carry out the study of CaTiO3 and BaTiO3.In this paper,the new photocatalyst Ag/AgCl/CaTiO3 and Ag/AgCl/BaTiO3 were successfully synthesized by precipitation-photoreduction process.The morphology,structure and optical properties of the prepared samples were characterized by XRD,SEM,TEM,EDX,FT-IR,UV-vis DRS and PL.And the photocatalytic degradation performance of the organic dye was tested by visible light irradiation.The research contents and achievements of the paper are as follows:The first chapter introduces the research background,development status,mechanism and application of semiconductor photocatalysis technology.Then,the structural characteristics,preparation methods and application status of the titanate photocatalytic materials are mainly introduced.At the same time,the research status of silver halide such as AgCl is also summarized.Finally,the significance and research contents of this paper are introduced.The second chapter introduces the preparation of Ag/AgCl/CaTiO3 and its photocatalytic activity under visible light.The Ag/AgCl nanoparticles were supported on the CaTiO3 matrix by precipitation-photoreduction,and the materials were characterized by CaTiO3 matrix.The photocatalytic performance of the samples was then evaluated by degradation of RhB.Compared with pure CaTiO3,the visible light photocatalytic activity of Ag/AgCl/CaTiO3 was obviously improved.Finally,the mechanism of the photocatalytic activity of the composites was explored by free radical capture experiments combined with the characterization results of the composites and the band structure analysis of the composite materials.The third chapter introduces the preparation of Ag/AgCl/BaTiO3 and its photocatalytic activity under visible light.The BaTiO3 nanoparticles were prepared by hydrothermal method.The Ag/AgCl/BaTiO3 complex was formed on the matrix by deposition-photoreduction.The composites were characterized by characterization.Degradation experiments were carried out with MO as the target dye,and the difference and stability of the photocatalytic degradation ability of different Ag/AgCl contents were investigated.The degradation mechanism of the photocatalyst was discussed by analyzing the active radical scavenging experiment and analyzing the band structure of the material.