Zn^(2+)离子掺杂对负载TiO_2薄膜光催化活性的影响

Influence of Zn^(2+) doping into titania film on different substrates on its photocatalytic activity

以钛酸丁酯和ZnSO4·7H2O为原料,采用溶胶 凝胶法在钛片、玻璃、釉面瓷砖、陶瓷、不锈钢和铝片六种载体上制备了Zn2+掺杂TiO2薄膜,讨论了不同Zn2+掺杂浓度下不同载体表面上制备的TiO2薄膜对甲基橙脱色率的影响。结果表明,Zn2+对TiO2薄膜的掺杂效果与载体的类型密切相关,并且不同载体其Zn2+掺杂的最佳浓度也不同。Zn2+掺杂后,TiO2薄膜光催化活性提高最大的是釉面瓷砖,其次是钛片、玻璃、陶瓷。不锈钢和铝片上TiO2薄膜的光催化活性不但没有升高,反而降低了。

Titania thin-film doped with Zn^(2+) and supported on titanium flakes, glass flakes, ceramic tiles, ceramics, stainless steel and aluminum flakes was prepared by sol-gel method using ZnSO_4·7H_2O and tetra-n-butyl titanate as the precursors. Photocatalytic activity of TiO_2 thin-film prepared on different substrates with different Zn^(2+) doping concentration were investigated via decomposition of methyl orange. The results showed that the effects of Zn^(2+) doping into TiO_2 thin-film were closely related to type of the substrates, and the optimal Zn^(2+) doping concentration varied with different substrates. Titania thin-film doped with Zn^(2+) on the ceramic tiles exhibited the most remarkable improvement on the photocatalytic activity, followed by titanium flakes, glass and ceramics; photocatalytic activity of TiO_2 thin-film on stainless steel and aluminum flakes declined after doping Zn^(2+).