Preparation And Photocatalytic Activity Of Visible Light Response RGO/Ag₁₀Si₄O₁₃ Composites

Nowdadys,traditional water pollution treatment methods cannot meet the growing needs of human society.Semiconductor photocatalysis technology,as a new treatment technology for water pollution,has been widely used due to its advantages of simple operation,low energy consumption,high efficiency and no secondary pollution.The optical response ability of photocatalytic materials is one of the key factors in the development of semiconductor photocatalytic technology.The Ag₁₀Si₄O₁₃semiconductor could absorb almost the full spectrum of sunlight due to its narrow band gap.And the photogenerated carriers with good photocatalytic activity quickly migrate to the surface of the material and participate in the degradation of organic pollutants under the action of the built-in electric field existing inside the crystal.In this study,Ag₁₀Si₄O₁₃ photocatalytic material was prepared by sol-gel method,and r GO/Ag₁₀Si₄O₁₃ composite photocatalytic materials was successfully prepared by ultraviolet irradiation reduction on above basis.The effects of GO addition on phase composition,microstructure and light absorption performance of r GO/Ag₁₀Si₄O₁₃ were studied by XRD,TEM,PL,XPS,UV-Vis DRS.Then,the adsorption and degradation properties of r GO/Ag₁₀Si₄O₁₃3 for methylene blue in aqueous solution were studied under visible light?wavelength??420 nm?.Studied the effect of GO addition on the prepared r GO/Ag₁₀Si₄O₁₃ properties.The effects of the initial p H value of the methylene blue solution and the amount of catalyst input on the degradation of methylene blue were analyzed,and the cycle stability of the composite photocatalyst was fitted and evaluated at the same time.The conclusions are as follows:1.The Ag₁₀Si₄O₁₃ prepared by sol-gel method is triclinic,and the average grain size,the morphology and band up value of the Ag₁₀Si₄O₁₃ is 18.9 nm,spherical,and1.74 e V,respectively.The average grain size of Ag₁₀Si₄O₁₃ in r GO/Ag₁₀Si₄O₁₃ prepared with 4wt%GO was reduced to 18.3nm,the morphology is regular polygon,the corresponding band gap is also reduced to 1.53 e V;2.r GO/Ag₁₀Si₄O₁₃ prepared with 5wt%GO has the best adsorption performance,and its adsorption capacity reaches 3.196mg/g,which is 1.82 times of pure Ag ₁₀Si₄O₁₃.r GO/Ag₁₀Si₄O₁₃ prepared with 5wt%GO exhibits excellent photocatalytic performance,and the highest degradation rate of MB by r GO/Ag₁₀Si₄O₁₃ prepared with 4wt%GO reached 98.72%,which was 1.14 times of the degradation rate of pure Ag ₁₀Si₄O₁₃;3.The degradation process of MB by r GO/Ag₁₀Si₄O₁₃ conforms to the first-order kinetic equation.When p H value of MB solution is 7,the reaction rate constant of r GO/Ag₁₀Si₄O₁₃ prepared with 4wt%GO is 0.1043,which is 2.12 times that of pure Ag₁₀Si₄O₁₃,and the reaction rate is the fastest;4.After four cycles of testing,the degradation efficiency of?4wt%?r GO/Ag₁₀Si₄O₁₃ is still 84.12%of the first degradation efficiency,which exhibits good cycling stability.This indicates r GO/Ag₁₀Si₄O₁₃3 is a photocatalytic material with potential application value for visible light response.