TiO_2薄膜光电催化亚甲基蓝的研究

Study on Photocatalytic Degradation of Methylene Blue by TiO_2 Thin Film

采用溶胶-凝胶-浸渍法在钛基底上制备了TiO2薄膜,以该薄膜为工作电极,石墨作对电极,饱和甘汞电极为参比电极,建立光电催化反应体系,对亚甲基蓝溶液进行了光电催化降解研究。结果表明:当外加偏压1.0 V,热处理温度500℃时,pH为10.2,TiO2薄膜光电催化活性最好,光电催化亚甲基蓝120 min可使其脱色率达64.3%。

TiO2 thin film was prepared by sol-gel-dipping method.TiO2 thin film was used as the working electrode with graphite as the counter electrode,and saturated calomel electrode as the reference electrode to study the photoelectrocatalytic degradation of methylene blue solution.The results indicated that the optimum bias voltage was 1.0V and the optimum calcination temperature was 500℃ and pH of 5.Methylene blue solution was decolored to 64.3% by TiO2 thin film photoelectrode in 120min.