醋酸处理对TiO_2纳米薄膜光催化性能的影响

Effects of CH_3COOH Treatment on Photocatalytic Activity of TiO_2 Nanometer Thin Films

用溶胶 -凝胶方法在普通玻璃基体上制备了均匀透明的TiO2 纳米薄膜 ,并经 5 0 0℃煅烧 2h ,煅烧后的TiO2 薄膜在2mol·L-1的CH3 COOH水溶液中处理 2 4h ,最后分别在 10 0和 5 0 0℃进行第二次热处理 .醋酸处理前后的薄膜分别用UV vis ,SEM ,XRD和XPS进行了表征 ,并用甲基橙水溶液的光催化降解评价TiO2 纳米薄膜的光催化性能 .结果发现 :用醋酸处理后的TiO2 纳米薄膜的光催化活性高于处理前薄膜的光催化活性 ;而且 ,酸处理后经 5 0 0℃热处理的TiO2 纳米薄膜的光催化活性明显高于经 10 0℃热处理的TiO2

The uniform transparent TiO 2 nanometer thin films were prepared on soda-lime glass via sol-gel method and calcined at 500 ℃ for 2 h.The as-calcined TiO 2 thin films were treated in 2 mol·L -1 CH 3COOH aqueous solution for 24 h, finally, the as-treated TiO 2 thin films were again heat-treated at 100 and 500 ℃ for 0.5 h, respectively.The structures and photocatalytic activity of TiO 2 thin films before and after surface acid treatment were characterized and evaluated by UV-vis, SEM, XRD, XPS and photocatalytic decoloration of methyl orange aqueous solution, respectively.It was found that the photocatalytic activity of TiO 2 nanometer thin films was enhanced after CH 3COOH treatment. Moreover, the films showed higher photocatalytic activity at 500 ℃ than at 100 ℃ after surface acid treatment.