TiO₂光催化与超亲水性薄膜的研究

【作者】 郑雪萍；

【导师】 孙力军；

【作者基本信息】 昆明理工大学 ， 材料学， 2004， 硕士

【摘要】 近年来，TiO₂薄膜的光催化性和超亲水性已成了光催化领域中研究的热点之一。本论文采用溶胶一凝胶法制备了TiO₂系薄膜，并对其性能进行了研究和分析。结果表明TiO₂薄膜的厚度、热处理温度和保温时间等因素均会影响薄膜的结晶情况，改变TiO₂薄膜的光催化性和超亲水性。 在掺杂的研究中发现，铈和镧的引入会提高TiO₂薄膜的光催化性和超亲水性，但当铈和镧的加入量超过某一数值时，反而会降低这两种性能，这是因为Ce和La本身不具有光催化性和亲水性，过量的铈和镧沉积在薄膜的表面，减小了薄膜的有效表面积。此外，镧和铈相比，在引入同样百分含量时，镧对TiO₂薄膜结晶的抑制大于铈对TiO₂薄膜结晶的抑制，更有利于提高TiO₂薄膜的光催化性和超亲水性。 在工艺条件的研究中发现，La-TiO₂和Ce-TiO₂复合薄膜的厚度、热处理温度和保温时间等因素对薄膜光催化性和亲水性的影响规律与对纯TiO₂薄膜的影响规律相同。 本研究中采用了S基片和玻璃基片两种不同的基片，发现S基片更有利于薄膜的结晶，而玻璃基片则阻碍薄膜的结晶。在同样的处理条件下，用S基片所镀薄膜的光催化性和超亲水性远远高于用玻璃基片所镀薄膜的光催化性和超亲水性。更多还原

【Abstract】 In recent years, it has attracted a great deal of attention that TiO2 films possess photocatalytic activity and super-hydrophilicity. In this thesis,TiO2 series thin films were prepared by sol-gel method and the properties of these films were researched and analyzed. The results are shown that the crystal of TiO2 film is affected by the factors of thickness, heat-treated temperature, and time of heat preservation which change the photocatalytic activity and super-hydrophilicity of TiO2 film.It was found in the course of doping that doping of Ce and La to TiO2 film improves the photocatalytic activity and the hydrophilicity, however, if the addition of these two elements is over a certain content, which will decrease two kinds of properties because they don’t possess the photocalalytic activity and hydrophilicity, and decrease the effective surface of film as the superfluous Ce and La deposit the surface of film.It was shown in technology research that the effect of film thickness, heat-treated temp’erature and time of heat preservation on the photocatalytic activity and hydrophilicity of La-TiO2 film and Ce-TiO2 film is similar as that pure TiO2 film.Two different substrates was adopted in this study, that the crystal of TiO2 film on S substrate is developed better than on glass. Under the same disposal condition, the photocatalytic activity and super-hydrophilicity of film on S substrate is higher than on glass was found.更多还原