Acid Treatment <sub> Of Tio 2 </ Sub> Thin Film Photocatalytic And Hydrophilic Properties Of The Study

In this paper, TiO₂ was treated with acid to enhance photocatalytic activity and hydrophilicity. Point research of this thesis is that the TiO₂ thin film are treated with acetic acid and sulfuric acid. From the angle of mechanism, the effection of acid treatment is studied on photocatalyticty and hydrophilicity. They are researched from making condition, sour density of treatment etc. Some innovate result are obtained from these researches, which is instructive meaning. It has innovation and meaning -ful research result as follows:1 .We investigated systematically the effect of series density of acetic acid and sulfuric acid on activity of hydrophilicity TiO₂ thin film. It show that the activity of hydrophilicity of thin film is connection with density of acid and category, the hydrophilicity of thin films induced by heat and light is obviously improved after acidic treatment. Among all the samples treated, The acetic acid optimum concentration is 1mol/L, but sulfuric acid is 0.4 mol/L. In optimum concentration, the film treated with 1mol/L acetic acid is the best at hydrophilicity and optical response of speed, in the meantime hydrophilic time is prolonged.It reachs super hydrophilicity in 1.5h through UV; thereafter it is still hydrophilic lucifuging 22h. thin film treated with sulfuric acid reaches super hydrophilicity in In; but it is not hydrophilic lucifuging 12h. The films reaches super hydrophilicity in 2.5h through Vis with 1mol/L; Thin films with 0.4mol/L do not. These show that acetic acid processing is advantageous to improving hydrophilicityactivity of thin film. Treated with sulfuric acid, optical response of speed of the thin film is super to untreated film. But from hydrophilicit -y comprehensive treatment with acetic acid is better than sulfuric acid.2. We investigated systematically the effect of series density of acetic acid and sulfuric acid on activity of photocatalys of TiO₂ thin film. This article shows that activity of photocatalys of TiO₂ thin film treated with acid is greatly increased. Among all the samples treated, the thin films treated with 1mol/L acetic acid and 0.4 mol/L sulfuric acid are the best at active photocatalyst. The rate degration of MB and MOsolution which is treated with 1 mol/L acetic acid is 66% and 45% on UV thorogh 3h ,and film treated with 0.4 mol/L sulfuric acid is 78% and 62%,but film untreated is 15%. The rate degration of MB and MOsolution which is treated with 1 mol/L acetic acid is 30% and 21% on Vis thorogh 3h ,and film treated with 0.4 mol/L sulfuric acid is 35% and 27%,From comprehensive photocatalytic activity,treatment with sulfuric acid is better than acetic acid.The analysis of structure indicated that size of TiO₂ particle is suppressed because of treatment with sulfuric acid.The isolated effect of space is produced because SO₄^2- is adherenced.Treatment of acetic acid does not produce the effect.Under same condition ,the size of TiO₂ particle is bigger.The analysis of surface appearance indicated that treatment with acid have an effect on surface appearance of TiO₂ film. Special surface appearance can greatly improve the active centre of surface of TiO₂ film, absorption of UV , quantun efficiency accelerating electron-hole separation.So treatment with acid have obvious effects on the photocatalytic activity and hydrophilic activity of thin film. This result is very important to realize the essence of photocatalysis and hydrophilicity.