Doped Tio <sub> 2 </ Sub> Light Catalytic Film Preparation And Performance Studies

The two big focus that the world faces are energy and environmental problems.The development and utilization of new clean energy,and the degradation and management of environmental is the foundation to ensure social high-speed development.TiO2 films could reduce energy consumption,purify circumstance due to their photocatalytic degradation of organic polluted compounds and antibacterial sterilization under the action in a certain illumination.So TiO2 film photocatalyst has an attractive prospect in the enviromental protection.This paper based on the literature review,the films of different molar ratio were prepared by sol-gel method in ethanol-hydrochloric acid-ultra pure water system.The influence of ethanol, hydrochloric acid and ultra pure for TiO2 film were studied by X-ray diffraction(XRD),Uv-vis absorption spectra(Uv-vis),Scan electron microscopy(SEM)and Atomic force microscope(AFM), and these were obtained that the changing laws of grain fineness number,unit cell parameter,surface roughness and so on.At last,the optimum molar ratio of TiO2 film preparation was obtain that the molar ratio of butyl acetate titanate,anhydrous alcohol,strong hydrochloric acid and ultra-pure water equal to 1:25:1.0:2.0.Under the best molar ratio,the TiO2 films were surface density,uniform without cracks,small grain size,surface roughness less and good potocatalytic activity,and the degradation rate of the five layers films could reach 85% after 60 minutes illumination.The preparation technology of Fe/TiO2. V/TiO2 and Co/TiO2 films were also studied,and the so-prepared potocatalysts were analyzed by X-ray photoelectron spectroscopy(XPS),XRD and photocatalytic activity test. XPS showed that Fe existed as Fe2O3 and V existed as V2O5, whereas Co existed as complex oxides.XRD showed that TiO2 in Fe/TiO2, V/TiO2 and CO/TiO2 films took an anatase structure when calcined under 600℃, and when the calcination temperature reached up to 700℃, it was transformed into the rutile structure. Low levels of Fe-doping(0.1%,0.5% and 1%) reduced the grainsize,and different levels V-doping and Co-doping increased the grainsize of TiO2.With high-pressure mercury lamp as ultraviolet light soure, the photodegradation of methy orange solution was carried out to investigate the activity of Fe/TiO2, V/TiO2 and Co/TiO2 films,the result is Fe/TiO2>V/TiO2>Co/TiO2. Low levels of Fe-doping improved the photocatalytic activity of TiO2 thin films, while the higher doping concentration made the photocatalytic activity of TiO2 thin films decreased, when Fe-doping is 0.1%,the degradation of methyl orange was the best,which reach to 98.21%. The photocatalytic antimicrobial activity of Fe/TiO2 films were studied, which were characterized by various techniques, such as AFM, Raman spectroscopy (Raman), Uv-vis,Positron annihilation(PAS),Contact angle analysis and so on. At the same time, with high-pressure xenon lamp as sunlight soure, the antibacterial properties of E.coli of Fe/TiO2 films in NS were study,it showed that the properties of low Fe-doping(0.1%,0.5%and 1%) is better than TiO2 films, when Fe-doping is 0.1%,the antibacterial rate of E.coli was the best,which reach to 96.67%. The antibacterial properties of 0.1% doping Fe/TiO2 films of various water were also studied,it inclouded the antibacterial properties of E.coli and total bacterial in printing and dyeing wastewater and antibacterial properties of total bacterial in surface water, a very good antibacterial properties was showed of 0.1% Fe/TiO2 films in every water, the antibacterial rate were 96.65%,95.57% and 95%.The TiO2 films were studid adopting this method of transition metal doped, and the macroscopic and microscopic analysis were explored through various analysis and characterization methods.The key technology of materials rate of preparation of films was solved,and the preparation technology of TiO2 films which were high photocatalytic activity were established through systematically experimental study. It laid a foundation for application in drinking water of Fe/TiO2 films,meanwhile,it also provided the technical basis for the practical application of antibacterial materials.