Preparation Of CS-Au NS@TiO₂ Composite Photocatalytic Material And Its Photocatalytic Degradation Of Pollutants

After more than a decade of research and development,plasma photocatalysis technology has made significant progress,especially the combine of TiO₂with precious metals receiving widespread attention.Precious metals can effectively improve the separation efficiency of e^-/h⁺and achieve full utilization of visible light.The high content of-NH₂and-OH in the structure of chitosan makes it bacome a natural polymer compound which widely be used for the adsorption and removal of environmental pollutants.In this dissertation,novel hybrid photocatalysis nanomaterials were fabricated based on CS-functionalized core-shell nanocomposites（CS-Au NS@TiO₂）.A systematic study was conducted on the performance of different nanocomposite photocatalysts for the degradation of environmental pollutants under different catalytic conditions.The research content is as follows:Through sol-gel method encapsulate TiO₂on the surface of anisotropic Au NS,which prepared by seed growth method,and successfully prepared Au NS@TiO₂nano core-shell structure.FE-SEM,EDS,FT-IR,XPS,XRD,TGA and UV-Vis were used to test the morphology,composition,structure,thermal stability,and photocatalytic performance of Au NS@TiO₂.And the effects of concentration and p H of crystal violet（CV）solution on Au NS@TiO₂photocatalytic performance were tested.Conducting free radical capture experiments and recycling experiments to explore the photocatalytic mechanism and reusability of Au NS@TiO₂.Through experiments the photocatalytic degradation of methylene blue（MB）and neutral red（NR）explored the universality of Au NS@TiO₂on photocatalytic degradation of dyes.Based on the previous work,firstly,we successfully prepared Au NS@TiO₂nano core-shell structure,followed by low-temperature crosslinking to modify CS on Au NS@TiO₂surface,prepared ternary CS-Au NS@TiO₂composite nano photocatalyst.FE-SEM,EDS,FT-IR,XPS,XRD,TGA and UV-Vis were used to test the morphology,composition,structure,thermal stability,and photocatalytic performance of CS-Au NS@TiO₂.And the effects of concentration and p H of CV,Congo Red（GR）and Cr（VI）solution on Au NS@TiO₂photocatalytic performance were tested.Conducting free radical capture experiments and recycling experiments to explore the photocatalytic mechanism and stability of CS-Au NS@TiO₂.