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提出了一种在室温条件下制备结晶TiO2介孔薄膜的简便方法。首先采用含有罗丹明B的TiO2纳米晶溶胶通过浸渍提拉制备结晶TiO2薄膜,然后将薄膜置于紫外灯下照射,通过TiO2薄膜自身的光催化作用将薄膜中的罗丹明B分解去除,从而形成介孔薄膜。分别采用X射线衍射仪、扫描电子显微镜和透射电子显微镜对样品进行了表征,并考察了薄膜对水的接触角及光催化活性。结果表明:所制备的TiO2介孔薄膜由30～50nm的纳米粒子组成,其晶型为锐钛矿-板钛矿-金红石混晶;适当的罗丹明B添加量有利于介孔形成;由于介孔的作用,TiO2介孔薄膜的亲水性及光催化活性相对于致密TiO2薄膜有显著提高。
A simple method of preparing crystalline TiO2 mesoporous films at room temperature was proposed. First, TiO2 nanocrystalline sol containing Rhodamine B is used to prepare a crystalline TiO2 film by dipping and then irradiating the film under a UV lamp to decompose and remove Rhodamine B in the film through the photocatalytic action of TiO2 film itself Mesoporous film. The samples were characterized by X-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The contact angle and photocatalytic activity of the films on water were also investigated. The results show that the prepared mesoporous TiO2 films are composed of 30-50nm nanoparticles with anatase-brookite-rutile mixed crystals. The proper amount of Rhodamine B is favorable to the formation of mesopores. The role of pores, TiO2 mesoporous membrane hydrophilic and photocatalytic activity relative to the dense TiO2 film has significantly improved.