Preparation Of Flourocarbon Aluminum Coating With The N-TiO₂Nanofilms At Low-temperature

Due to TiO2has been used sunlight as a potential light source,no secondarypollution,reuable,chemical stability,etc.However,the following main issues limitingthe TiO2photocatalytic technology applications(1) photo-generated carriers(e-,h+)compound easily,affecting the efficiency of the photocatalysis,it is hard to competewith conventional environmental technology.(2)Series of semiconductor representedby TiO2photocatalyst with wider bandgap (For example anatase TiO2band gapEg=3.2eV),it can only absorb less than or equal to387nm wavelength ultravioletlight,however,part of the ultraviolet of the sun is less than5%of the total,the rest forvisible light,it can not take full advantage of sunlight,which greatly limited the exentof its practical application.A great deal of scientific research proved that using non-metal doping,especiallyN-TiO2can effectively expand the scope of its spectral response to the visible light, soas to improve the photocatalytic activity of TiO2;Based on current domestic andforeign research status of non-metal-doped or co-doped TiO2modified, this paperfurther explores the low-temperature preparation method of N-TiO2sol and N-TiO2films loading fluorocarbon aluminum surface.In this paper, butyl titanate as precursor, ethanol as a solvent, acetylacetone as achelating agent, hydrochloric acid as a catalyst, the sol-gel method for preparingN-TiO2sol in low-temperature, with self-cleaning function of flourocarbon aluminum.Change original TiO2sol pH value、alcohol titanium ratio, water bath temperature andchanging parameters and ratio of titanium of nitrogen in the N-TiO2sol and otherparameters,to prepare anatase as the main, with hydrophilic and light catalytic activityof N-TiO2sol. X-ray diffraction (XRD), optical microscopy, scanning electronmicroscopy (SEM), differential thermal analysis (DTA), Fourier transform infraredspectroscopy (FTIR), UV-visible spectroscopy (UV-Vis)were used to characterize themicrostructure of the N-TiO2photocatalyst and the surface morphology; At the sametime, the preparation of visible light photocatalyst activity the degradation ofmethylene blue solution is used to characterize its photocatalytic activity. The results showed that:(1) that is fixed molar ratio of butyl titanate, ethanol,deionized water, urea and acetylacetone is1:10:120:0.4:0.06, as the change of pHvalue, nanometer N-TiO2crystal sharp titanium peaks, rutile phase increase; pH=2ofN-TiO2crystal has good crystallinity and type.(2) Fixed butyl titanate, deionized water, acetyl acetone and the molar ratio ofurea to1:120:0.4:0.06, pH=2, with the decrease of the molar ratio of titaniumalkoxide, it easily obtain anatase and rutile mixed crystal type, almost no obviouschange;And mole ratio of Ti to alcohol had no effect on the photocatalytic of N-TiO2sol.(3) Fixed butyl titanate, anhydrous ethanol, deionized water, acetyl acetone andthe molar ratio of urea to1:10:120:0.4:0.06, pH=2, with the decrease of the waterbath temperature, it is easier to obtain anatase type; When the bath temperature is85℃, itappeared more rutile type. N-TiO2sol prepared in the context of higher waterbath temprature has better photocatalytic properties; So the sample works best whenwater bath temperature65℃.(4) fixed butyl titanate, anhydrous ethanol, deionized water and the molar ratioof acetylacetone1:10:120:0.4, pH=2, with the increase of molar ratio of nitrogen totitanium, anatase tends perfect, crystallite size increased significantly; while thesample absorption edge has a "redshift", photocatalytic capacity enhancement.