铜离子掺杂对二氧化钛薄膜光催化性能的影响

EFFECT OF COPPER ION DOPANTS ON PHOTOCATALYSIS ACTIVITY OF TITANIUM DIOXIDE THIN FILMS

采用溶胶凝胶法在玻璃表面制备了Cu2+掺杂TiO2复合纳米薄膜。掺杂Cu2+的数量和方式及前驱体对TiO2光催化降解甲基橙有不同程度的影响。当合成TiO2前驱体的原料为Ti(OC4H9)4时,预涂一层质量分数(下同)为1.0%的Cu(CH3COO)2水溶液,可使TiO2光催化氧化活性提高53%,最外层掺入Cu2+会减弱TiO2光催化氧化活性。当TiO2的前驱体为工业偏钛酸时,预涂一层1.0%Cu(CH3COO)2水溶液,仅使TiO2光催化氧化活性提高14%。用X射线衍射对纳米薄膜进行表征。Cu2+掺杂会诱导生成金红石相。

Copper ion-doped TiO2 nanometer composite thin films on glass substrate were prepared by a sol - gel process. Copper-dopants concentration, the doping method and precursors of TiO2 affect the photocatalysis activity of the TiO2 films obtained on the decomposition of methyl orange. When Ti（OC4H9）4 is the precursor of TiO2, the film activity increases by 53% if a 1% （in mass） Cu（CH3COO）2 solution is applied to the glass substrate prior to depositing TiO2 on it. The photocatalysis activity, however, can be reduced by the Cu^2＋ dopants that are deposited on the surface of TiO2 films. When metatitanic acid is used as the precursor, the activity of doped TiO2 films increases by 14% only after Cu（CH3COO）2 solution is prior depositing on the glass substrate. Titanium dioxide thin films were characterized with X-ray diffraction techniques. In Cu^2＋-doped TiO2 thin films, Cu^2＋ dopants may induce the formation of rutile.