Preparation And Photocatalysis Preformance Of Modified TiO₂Photocatalyst

This research used the montmorillonite （MMT） and multi-walled carbon nanotubes（MWCNTs） as the carrier，adopted the mental and non-mental doping to modify TiO₂. Theprepared samples were characterized by different methods such as X-ray Diffraction（XRD）、Transmission Electron Microscopy（TEM）、UV-visible absorption spectrum（UV-vis）. Thedegradation of dye wastewater was used as a model reaction to test the photocatalytic activityof the samples.（1）In-TiO₂/MMT nanocomposite photocatalyst is composed by Sol-gel processes andSupercritical Fluid Drying （SCFD） methods. The results show that anatase type TiO₂is formed,and the main particle size is between13～18nm. The photocatalytic activity is evaluated byphotocatalytic degradation of the concentration loss of MB.The degradation rate of MB and TOCare separately99.2%and63.9%,when the calcine temperature is700℃, the optimum doping ofIn is2%.（2） B-TiO₂/MMT were prepared by Sol-gel method. The XRD result shows that theexisting form of TiO₂is anatase, with no obvious agglomeration phenomenon. TEM showscatalyst particles dispersed well with uniform size. The catalyst’s absorption of light moves tolonger wavelengths.（3） In-TiO₂/MNWCNTs were prepared by Sol-gel method and the samplesare dried by Supercritical Fluid Drying method. The result shows that TiO₂in the photocatalystis anatase, the average particle diameter is about10nm. In-doped can decrease the band-gapenergy of titania. The photocatalyst degradation rate of MO and TOC are separately100%and76.7%, when the optimum dope of In is2%, and the concent of MWCNTs is3.0%.（4） TheB-TiO₂/MWCNTs photocatalyst is composed by Sol-gel processes and Supercritical FluidDrying （SCFD） methods. The result shows that TiO₂in the photocatalyst is anatase, B-dopeddidn’t affect the crystal form of the TiO₂. And the band-gap energy can be reduced to3.02eV.The photocatalyst degradation rate of MO and MB were98.8%and99%, the degradation rateof TOC were74%and86%.