Study On The Photocatalytic Properties Of Graphene Based Titanium Dioxide Surface Plasma Composites

In this paper,graphene composite titanium dioxide as the basic carrier,Graphene titanium dioxide composites was modified by functionalized new materials.The composite material combines the advantages of graphene and other materials,and applied to the photocatalytic degradation in wastewater.The content of this paper is divided into the following parts:(1)Titania nanotubes were prepared by hydrothermal method,and the silver nanoparticles were loaded on the surface of TiO2 nanotubes.The surface plasma composite photocatalyst magnetic graphene oxide / silver loaded titanium dioxide nanotube composite(Ag-TNTs/MGO)was successfully prepared.The Ag-TNTs/MGO was characterized by X-ray Diffraction(XRD),Fourier Transform Infrared spectra(FT-IR)and Scanning Electron Microscopy(SEM),Transmission Electron Microscope(TEM),Raman spectra,Brunner-Emmet-Teller measurements(BET),UV-Vis diffuse reflectance spectra(DRUVS)and the optimum catalytic conditions of Ag-TNTs/MGO such as pH,catalyst concentration,initial antibiotic concentration,illumination time,reused times were explored and the photocatalytic degradation mechanism was discussed.The catalytic activity of the new catalyst was improved and the photocatalytic efficiency of the catalyst was increased.The maximum photocatalytic efficiency of the Ag-TNTs/MGO under UV light and visible light for dioctyl phthalate was 91.13% and 81.60%.And the catalyst can be reused three times.(2)Ag loaded TiO2 nanowire arrays/graphene oxide coated carbon fiber composites(Ag-TiO2NAs@GOCF)with a large surface area,high photocatalytic efficiency and a good visible light response was synthesized use the new method by growing of titania nanowire arrays(TiO2NAs)on the surface of graphene oxide coated carbon fibers(GOCF)prior to loading with Ag.The Ag-TiO2NAs@GOCF was characterized by X-ray Diffraction(XRD),Fourier Transform Infrared spectra(FT-IR)and Scanning Electron Microscopy(SEM),Raman spectra,Brunner-Emmet-Teller measurements(BET),UV-Vis diffuse reflectance spectra(DRUVS)and the optimum catalytic conditions of Ag-TiO2NAs@GOCF such as pH,catalyst concentration,initial antibiotic concentration,illumination time,reused times were explored and the photocatalytic degradation mechanism was discussed.The catalytic activityof the new catalyst was improved and the photocatalytic efficiency of the catalyst was increased.The maximum photocatalytic efficiency of the Ag-TiO2NAs@GOCF under UV light and visible light for tetracycline hydrochloride was 95.68% and 84.63%.And the catalyst can be reused four times.(3)we report enhanced photocatalytic degradation of chrome black T in aqueous solution by using silver loaded to titania nanotubes combined with magnetic chitosan/β-cyclodextrin as a photocatalyst(Ag-TNTs/MCDS).X-ray diffraction(XRD),Fourier transform infrared spectra(FT-IR),Transmission electron microscopy(TEM)and Scannig electron microscopy(SEM)are used to compare the structural properties of Ag-TNTs/MCDS.And the optimum catalytic conditions of Ag-TNTs/MCDS such as pH,catalyst concentration,initial dye concentration,illumination time,reused times were explored.For degradation of chrome black T(CBT),the photocatalytic activity of different catalysts were also compared.The maximum photocatalytic degradation efficiency of the Ag-TNTs/MCDS under UV light and visible light for CBT were 94.48% and 91.27%,respectively.And the catalyst can be reused five times.silver loaded titania/magnetic graphene oxide-multi-walled carbon nanotubes composites(MGO-MWCNTs@Ag-TiO2)was synthesized by hydrothermal method.The MGO-MWCNTs@Ag-TiO2 was characterized by X-ray Diffraction(XRD),Fourier Transform Infrared spectra(FT-IR)and Scanning Electron Microscopy(SEM),and the optimum catalytic conditions of MGO-MWCNTs@Ag-TiO2 such as pH,catalyst concentration,initial concentration,illumination time,reused times were explored.And the photocatalytic activity of different catalysts were also compared.The catalytic activity of the new catalyst in visible light was improved and the photocatalytic efficiency of the catalyst was increased.The maximum photocatalytic efficiency of the MGO-MWCNTs@Ag-TiO2 under UV light and visible light for piperacillin sodium were 94.75% and 91.59%.And the catalyst can be reused four times.