【作者】 崔强；

【导师】 冯波；

【作者基本信息】 西南交通大学 ， 生物医学工程， 2010， 硕士

【摘要】 纳米Ti02由于具有较高的催化活性、无毒害性以及长期的稳定性,在光催化降解有机污染物以及抗菌方面越来越受到人们的重视。Ti02纳米管阵列在具备传统Ti02粉体比表面积大,光催化活性高等优点的同时,还具备负载性好、易回收和可重复使用的特性。本论文利用阳极氧化法在钛底材表面制备了氧化钛纳米管薄膜,研究了其结构与形貌对光催化性和抗菌性能的影响,初步探讨了作用机理。通过控制阳极氧化过程的电压、氧化时间以及热处理来控制钛片表面Ti02纳米管阵列薄膜的形貌和结构,通过微弧氧化法制备TiO2多孔薄膜。采用扫描电子显微镜和X射线衍射仪等手段对其形貌和结构进行表征,发现：采用阳极氧化法在钛基底上制得管径、管长以及晶型各异的TiO2纳米管薄膜,通过微弧氧化法制备了TiO2多孔薄膜。通过光催化降解甲基橙溶液实验考查形貌与结构对纳米管薄膜光催化性能的影响,通过重复催化实验考查纳米管薄膜的重复使用性能,通过对比甲基橙与苯酚的降解实验考查催化剂对被降解物的选择性,并对比了纳米管薄膜与多孔薄膜、纳米粉的光催化性能。采用紫外可见分光光度计对降解率进行了表征。发现：管径为100nm,晶型为锐钛矿时纳米管有最佳的光催化活性,管长则基本不影响催化剂的催化活性。纳米管薄膜有良好的重复使用性能,纳米管薄膜对被降解物有一定的选择性。纳米管薄膜的催化性能明显高于多孔薄膜,而与纳米粉基本接近。通过光催化抗菌实验考查了形貌与结构对纳米管薄膜抗菌性能的影响,并对比了纳米管薄膜与多孔薄膜的抗菌性能。发现：管径为200nm及50nm、晶型为锐钛矿时纳米管有较好的抗菌性能,管长则基本不影响其抗菌性能。纳米管薄膜的抗菌性能明显高于多孔薄膜。通过银镜反应法在纳米管表面沉积银,并考查了纳米管的载银抗菌性能。发现：载银纳米管薄膜的抗菌效果非常良好,4h光催化抗菌后对大肠杆菌的消除率为100%。更多还原

【Abstract】 Nano-TiO2 as a photocatalytic material with attractive characteristics of high photocatalytic property, nontoxicity and long-term stability has been given more and more attention in the fields of pollutant degradation and antibacterial. TiO2 nanotube array film not only possesses high specific surface area and high photocatalytic property which the traditional TiO2 nano-powder has, but also has good immobilization on the substrate. Besides, it is easy to recycle, and can be reused.In this article, TiO2 nanotube array film was fabricated on Ti substrate through electrochemical anodization, and the effects of its morphology and structure on its photocatalytic activity and antibacterial property were researched.Through controlling the anodizing voltage, anodizing time of electrochemical anodization, and heat treatment, TiO2 nanotube arrays with morphology and structure were fabricated. TiO2 porous film was fabricated by micro-arc oxidation. The morphology and the structure of TiO2 films were characterized respectively by means of SEM, XRD. The results indicate that nanotube arrays with different tubediameter, tubulength and crystallites are formed on Ti substrate through anodization. TiO2 porous film is formed through micro-arc oxidation.The effects of morphology and structure of nanotube arrays on its photocatalytic activity were researched by decolorization of methyl orange in aqueous solution. The reusability of catalyst was investigated by repeated photocatalytic reaction expenriment. The catalyst’s selectivity on pollutants was evalued by comparison of degradations of phenol and methyl orange. The degradation of pollutants was characterized respectively by the mean of uv-vis spectrophotometer. The results indicate that the TiO2 nanotube films with the diameter of 100nm and with structure of anatase exhibits the best photocatalytic activity, and the length of nanotube has little effect on the photocatalytic activity. TiO2 nanotube film has excellent resuability as photocatalyst. The nanotube film in some degree shows selectivity on pollutants. The photocatalytic activity of nanotube arrays is much higher than that of TiO2 porous film, but close with that of nano-powder.The effects of morphology and structure of nanotube arrays on its antibacterial were investigated by antibacterial experiment. The results indicate that the TiO2 nanotube film with the diameter of 100nm of 50nm and with structure of anatase exhibits the best antibacterial property. The length of nanotube has little effect on the antibacterial property. The nanotube film has higher antibacterial property than TiO2 porous film.The antibacterial property of nanotube film which was coated with silver particles through a disturbed silver-mirror reaction was investigated. The results indicate that Ag deposited nanotube film shows excellent antibacterial property, and the removal rate of colon bacillus reaches nearly 100% after 4h antibacterial experiment.更多还原