Functional Tio <sub> 2 </ Sub> Thin Films And Characterized

Environmental purification using TiO₂ photo-catalysts has attracted a great deal of attention with the increasing number of recent environmental problems in the world.In order to enhance the TiO₂ photocatalyst activeness,this research used the metallic ion doping to modify TiO₂ on the base of analyzing TiO₂ photochemical mechanism.Selected transition metal Fe Cu,precious metal Ag,rai'e-earth element Ce,Sm and Fe+Sm to prepare the doping modification nanometer TiO₂ by using the sol-gel method,made a five factors to the level of six orthogonal series of ion doping test then I ascertained the best adulteration condition is that Ag+3.2%additive quantity+seven lays+four hours the time of illumination.The sol for Ag-TiO₂ films was prepared with tetrabutyl titanate as precursor,coated on the slide glass.Under the same ratio of Ag/TiO₂ and the same system n(Ti(OC₄H9)₄):n(C₂H₅OH):n〔NH(C₂H₄OH)₂〕:n(H₂O):n(AgNO₃) =1:18:0.5:1:3.2%, investigating the effects in different pH and two lights.The photocatalytic activity of the prepared film was studied by the degradation of methyl orange;when the pH between 3～6, the conversion can get to 83%,whichever the two lights.The microstructure and properties of the films were studied by the ways of SEM,AFM, TEM,FTIR,EDX,DSC-TGA,XRD,adhesion test and so on.The results shows that:the photo-catalytic thin film is mainly composed of AgNO₃ and TiO₂ particles of 10～23nm, films with good surface morphology,structure composed of dense,uniform particle size distribution,and firmly attached vector,Ag-doped TiO₂ promoted from the TiO₂ anatase to rutile change,the phase transformation of anatase was sufficiency at 500℃～550℃.Two options were prepared by a super-hydrophilic property of SiO₂/TiO₂ film.FTIR spectrogram conformed TiO₂,SiO₂,and the SiO₂/TiO₂ structure composition.From the water contact chart may clear seeing:the first programme of the film TiO₂/SiO₂ water contact angle of about 4°,the best of its self-cleaning effect.Adsorption testing done seaweed about TiO₂ films,Ag-TiO₂ photocatalytic films and SiO₂/TiO₂ films.