混晶纳米TiO_2薄膜光催化剂的新型制备方法及性能研究  

Novel Synthesis and Property of TiO_2 Nano Film Photocatalyst with Mixed Phases

作　　者：吴亚惠[1] 龙明策[2] 蔡伟民[1,2] 

机构地区：[1]哈尔滨工业大学城市水资源与水环境国家重点实验室,黑龙江哈尔滨150090 [2]上海交通大学环境科学与工程学院,上海200240

出　　处：《高校化学工程学报》2010年第6期1005-1010,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：哈尔滨工业大学城市水资源与水环境国家重点实验室开放基金项目(QAK200805)

摘　　要：采用新型的制备方法原位制备了钛基底上的TiO2纳米薄膜。制备过程包括钛金属的氧化过程和对氧化过程中形成的无定形表层的水热处理过程。钛基底上在氧化过程中形成了不平整的表面,水热过程使得无定形二氧化钛晶化。最终得到的纳米TiO2薄膜具有锐钛矿/金红石混合晶相和纳米花状结构。利用扫描电子显微镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和拉曼光谱等表征技术研究了TiO2薄膜的形貌和特性。薄膜的光催化性能由水中甲基橙的降解来表征。与没有经过水热反应直接煅烧的样品相比,水热反应得到的TiO2薄膜具有较高的光催化活性。同时研究了水热反应温度与时间对薄膜性质的影响;提高水热反应的温度或者延长水热反应的时间可以提高薄膜的结晶度,从而提高薄膜的光催化效率。A novel synthetic route is developed for the in-situ production of TiO2 nanometer film on Ti substrate.The approach involves the oxidation of the Ti metal substrate and hydrothermal treatment of the amorphous layer obtained in previous step.The former step ensures a rough oxidized titanium surface and the latter step facilitates the crystallization of the amorphous titanium dioxide.The as-prepared nanometer films possess both the anatase and rutile phases and flower-like structures.The morphologies and properties of the as-prepared TiO2 films were investigated by means of scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,X-ray diffraction（XRD） and Raman spectrometer,respectively.The forming process of the nanometer film was discussed,and its photocatalytic activity was evaluated by its photocatalytic decomposition of methyl orange in water.Compared with the traditional annealed sample without hydrothermal treatment,its enhanced photocatalytic performance was observed.The effects of hydrothermal temperature and time on the photocatalytic performance of the prepared TiO2 film were also investigated.The results show that the photocatalytic activities of the nanometer flower-like TiO2 films can be improved with the increasing hydrothermal temperature or the prolonging hydrothermal time,for the crystallinity of films becomes higher.

关 键 词：二氧化钛 纳米薄膜 光催化剂 混晶相 制备 

分 类 号：TQ426.6[化学工程] TQ134.11