Preparation Of Triethylamine Modified Titanium Dioxide Film In Normal Temperature And Its' Photocatalytic Performance Study

The problem of environment and energy become more and more serious now.All over the world focus the problem and try to deal it.Titanium dioxide,as an excellent photocatalytic materials is researched thoroughly because of low price,non-toxic,high catalytic efficiency and easy to operate.However,weak visible spectral response and fast recombination rate of photo-generated electron-hole pair limits its application in practice.So the research to enhance the visible light activity is very important in this field.N-doped was a possible method to improve its' visible light activity.The process of high-heat treatment limited the application of TiO₂.Based on the actuality,the preparation and properties of triethylamine modified titanium dioxide film in room-temperature was posed in this paper.The TiO₂-sol in anatase phase was synthesized at room temperature through sol-gel method.In this study,butyl titanate was used as precursor,ethanol as impregnate and HCl as catalyzer.Then under violent agitating,the triethylamine was used as modifying agent to be doped into the TiO₂ solution.The dosage and temperature were changed to look for the optimum.Triethylamine with butyl titanate was used as a precursor to prepare Triethylamine modified TiO₂-sol.The TiO₂ films were prepared by the dip-coating for thrice used the solutions prepared as above.After that,the crystal structure and the photocatalytic efficiency of the samples completed were tested through XRD,SEM,TEM,Volume analyzer,UV-Vis,FT-IR.The research results were shown below:Firstly,the modified TiO₂ sol remained be anatase crystalline,the difference is that the TiO₂ modified as Triethylamine doped later has a better property than the one doped with butyl titanate.Secondly,when the pH of sol was change to neutral as Triethylamine doped the TiO₂-sol show out worst stability.Then it will re-stable as Triethylamine being kept on doping.But it won't improve the visible light photocatalytic ability.The mass ratio of m (Triethylamine):m(butyl titanate)reaches to 1:1 show out to be the best.As the temperature rises,the modified TiO₂ displays better visible-light absorptivity even though the volume of particle growth quite fast because of the high temperature,which weaken the photocatalytic ability.From above,the optimum temperature was 65℃and modified TiO₂ flims showd the best photodecomposition performance. The modified TiO₂ perform better visible-light absorptive than the pure TiO₂.At the same time,the modified TiO₂ has better photocatalytic activity than the pure one from the degradation of Rhodamine B under visible-light.The degradation speed constant is seven times more than the pure one.The modified TiO₂ remind has a steady catalytic activity in long-last experiment.