不同离子掺杂TiO_2薄膜及光催化活性研究

采用溶胶-凝胶法分别制备了掺杂Fe^3＋、Cu^2＋、Zn^2＋、Ce^3＋和La^3＋5种不同离子的纳米级TiO2薄膜,使用TiO2薄膜对亚甲基蓝溶液进行光催化试验。研究表明,在5种掺杂离子中,其La^3＋的掺杂效果最好,当La^3＋的适宜含量为1.8%（质量分数）时,掺杂与未掺杂的XRD图谱基本一致;掺入La^3＋离子使得TiO2的晶粒变小,可抑制晶相向金红石相转变;随着焙烧温度的升高TiO2晶粒逐渐变大,温度为700℃时,其粒径为27.6nm,TiO2为混合晶型（锐钛矿型和金红石型）,其活性最高。

Photocatalytic Properties of TiO2 Thin Films Doped with Various Metal Ions

Abstract： Nanosized TiO2 thin films doped respectively with Fe^3＋ , Cu^2＋, Zn^2＋ , Ce^3＋ , La^3＋ were prepared by sol-gel method and characterized by XRD. The prepared film was used in the photocatalytic experiment of methylene blue. The experimental results showed that the film doped with La^3＋ was the best of the five doping ions. When the content of La^3＋ doped was 1.8 % （ mass ratio）, no much difference was observed in XRD between La^3＋ doped TiO2 and non-doped TiO2. The particle diameter of TiO2 decreased by the doping of La^3＋ and the crystal was restrained to become rutile structure. The particle of TiO2 increased with the increase of calcination temperture. The particle diameter was 27.6 nm at 700 ℃ and the crystal was mixed crystal with highest catalytic activity.