铜离子掺杂对二氧化钛薄膜光催化性能的影响

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.

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

Copper ion-doped TiO_2 nanometer composite thin films on glass substrate were prepared by a solgel process. Copper-dopants concentration, the doping method and precursors of TiO_2 affect the photocatalysis activity of the TiO_2 films obtained on the decomposition of methyl orange. When Ti(OC_4H_9)_ 4 is the precursor of TiO_2, the film activity increases by 53% if a 1% (in mass) Cu(CH_3COO)_2 solution is applied to the glass substrate prior to depositing TiO_2 on it. The photocatalysis activity, however, can be reduced by the Cu 2+ dopants that are deposited on the surface of TiO_2 films. When metatitanic acid is used as the precursor, the activity of doped TiO_2 films increases by 14% only after Cu(CH_3COO)_2 solution is prior depositing on the glass substrate. Titanium dioxide thin films were characterized with X-ray diffraction techniques. In Cu 2+-doped TiO_2 thin films, Cu 2+ dopants may induce the formation of rutile.