改性TiO_2纳米薄膜及其可见光降解甲醛研究

以无机盐TiOSO4为主要原料,采用低温回流技术,于130℃下在玻璃基底上制备了TiO2纳米薄膜,研究了单离子掺杂和双离子掺杂对材料结构特性和可见光催化降解甲醛特性的影响。结果表明,选取La3+和Fe3+分别掺杂以及以2种离子共同掺杂,在可见光下对甲醛气体的降解试验中,TiO2基薄膜均表现出较高的光催化活性,尤其是在2种离子双掺杂的情况,在6 h可见光照射下,对甲醛的降解率达到90%。纳米尺度的锐钛矿结构以及离子掺杂改变TiO2材料带隙结构是该薄膜材料具有可见光催化活性的根本原因。

Low Temperature Synthesis of Doped TiO2 Nanometer Film and Its Visible-Light Photocatalytic Degradation of Formaldehyde

In this paper,inorganic salt TiOSO4 was employed as the raw material to prepare TiO2 nano films on glass substrate via refluxed sol technique at 130 ℃.The structure characteristics and photocatalytic degradation of formaldehyde under visible-light which were affected by single or double ion doping were then investigated.The results indicated that TiO2 films,doped with La^3 ＋,Fe^3 ＋ or these two co-doping,exhibited excellent photocatalytic activity which was evaluated by degradation of formaldehyde under visible-light.As for the TiO2 film with La^3 ＋ and Fe^3 ＋ co-doping,the degradation rate of formaldehyde reached 90% after visible-light irradiation for 6 h.The photocatalytic activity of these films under visible-light can be ascribed to nanoscaled anatase structure and the change of band gap structures after doping ions.