The Modification And Photocatalytic Properties Study Of AgIn₅S₈ Ternary Chalcogenide Compounds

Many conveniences have been brought to human with the rapid development of science and technology,which also brought many negative effects,such as environmental pollution and Greenhouse effect.Water pollution in environmental pollution has always been a urgent problem that scientists are trying to solve.At present,the removal of pollutants from water by photocatalytic degradation is a very hot field.In this paper,AgIn₅S₈-based photocatalyst composites were obtained for high efficiency removal of organic pollutants in water.The composition,structure,properties and catalytic mechanism of the AgIn₅S₈-based photocatalyst composites were tested and proposed.The main research contents are as follows:?1?Plasma resonance Ag/AgIn₅S₈ photocatalyst was synthesized and related properties were researched.The Ag/AgIn₅S₈ photocatalysts were prepared using AgNO₃ as the silver source,In?NO₃?₃ as indium and thioacetamide as the sulfur source,and the Ag/AgIn₅S₈ composites were synthesized by solvothermal method and further photo-reduction approach.The crystal structure,composition,morphology and properties of the materials were measured by XRD,XPS,SEM,TEM,and UV-vis diffuse reflectance,etc.Ag/AgIn₅S₈ not only has good photocatalytic degradation ability for tetracycline?95.3%?,but also has good mineralization ability?56.3%?and COD removal efficiency for actual wastewater?77.6%?.The photocatalytic mechanism of Ag/AgIn₅S₈ for degradation of organic molecules are also proposed.?2?RGO/AgIn₅S₈ composites were synthesized by one-step solvothermal method.The structure,composition and properties of the RGO/AgIn₅S₈ composites were determined by XRD,XPS,SEM,TEM,Raman and UV-Vis diffuse reflectance.When the content of rGO is 1%RGO/AgIn₅S₈ composites shows the highest photocatalytic performance with 93.2%and 91%degradation efficiency for 2-NP and 4-NP under visible light,respectively.Additionally,1%rGO/AgIn₅S₈ exhibits excellent reusability in four cycles due to its anti-photocorrosion ability,stable crystal structure,surface composition and chemical valence state.And 1%rGO/AgIn₅S₈ also has good COD removal ability in the treatment of actual pharmaceutical wastewater?89%?.?3?Preparation and application of MoS₂/AgIn₅S₈ composites.A series of AgIn₅S₈/Bi₂WO₆ composites were prepared via solvothermal method using Bi?NO₃?₃,AgNO₃,In?NO₃?₃,Na₂WO₄ and thioacetamide as bismuth source,silver source,indium source,tungsten source and sulfur source,respectively.The photocatalytic properties of AgIn₅S₈/Bi₂WO₆ composites with different AgIn₅S₈ content measured by degrading TC·HCl under visible light.The AgIn₅S₈ content in AgIn₅S₈/Bi₂WO₆composites was optimized.When the AgIn₅S₈ content is 10%,AgIn₅S₈/Bi₂WO₆composites show the highest photocatalytic activity with 92%degradation efficiency.Moreover,it can effectively treat actual pharmaceutical wastewater with 77%COD removal efficiency.