纳米粒子TiO_2/Ti膜的制备及其光催化活性

Preparation and photocatalytic activity of nanoparticle TiO_2/Ti films

以钛酸四丁酯为原料,利用溶胶-凝胶方法制备了纳米粒子TiO2/Ti膜.TG-DTA、XRD、TEM和SEM的测试表明:纳米粒子经历了无定型向锐钛矿和锐钛矿向金红石相转变两个过程,而焙烧温度为600℃时,TiO2纳米粒子具有与国际商品P-25型TiO2粒子相类似的组成、结构、形貌和粒子尺寸.考虑TiO2粒子性质及与基体Ti片的结合能力,焙烧温度对基体Ti片的影响和纳米粒子TiO2/Ti膜表面形貌等因素,确定600℃是制备纳米粒子TiO2/Ti膜光催化剂的最合适的焙烧温度.另外,以光催化降解苯酚为模型反应,考察了焙烧温度对纳米粒子TiO2/Ti膜催化活性的影响,并初步地探讨了光催化降解苯酚反应的动力学.结果表明:600℃焙烧的TiO2纳米粒子膜具有最高的光催化活性,而光催化降解反应为准一级动力学反应.

The nanoparticle Ti02/Ti films were prepared by a sol -gel process using Ti(OC4H9)4 as raw material, the as -prepared film samples were also characterized by TG - DTA,XRD,TEM 和SEM techniques. The results indicated that Ti02 nanoparticle experienced the two transition process of amorphous phase to anatase and anatase to rutile. When calcining temperature was 600℃ , Ti02 nanoparticle had similar composition, structure, morphology and particle size with the international commodity P-25 Ti02. The conclusion that the most appropriate calcining temperature might be at 600℃during preparation process of nanoparticle Ti02/Ti film photocat-alyst was made by considering the factors such as the properties of Ti02 nanoparticle, the adhesion of nanoparticle Ti02/Ti film to Ti substrate, the effects of calcining temperature on Ti substrate and the surface morphology of nanoparticle Ti02/Ti film. In addition, the photocatalytic activity of nanoparticle Ti02/Ti films was evaluated using the photocatalytic degradation phenol as a model reaction, investigating the effects of calcining temperature on the photocatalytic activity, and the kinetics of photocatalytic degradation phenol reaction was also primarily discussed. The results showed that the photocatalytic activity of nanoparticle Ti02/Ti film calcined at 600℃was the highest, and the order of photocatalytic degradation phenol reaction was pseudo one.