Ru-TiO_2光电极对亚甲基蓝的光电催化降解

采用阳极氧化法制备Ru-TiO2光电极,以该电极为工作电极,石墨作对电极,饱和甘汞电极为参比电极,对亚甲基蓝溶液的光电催化降解进行了研究。结果表明:煅烧温度600℃,掺杂1%Ru的Ru-TiO2光电极催化活性最好;以紫外灯(125 W)为光源,当外加偏压0.2 V,pH为5时,Ru-TiO2光电催化亚甲基蓝120 min可使其完全脱色;亚甲基蓝的光电催化降解遵从Langmuir-Hinshelwood动力学模型,测得其反应速率常数k=0.781 mmol/(L.min),吸附常数K=0.225 L/mmol。

Photoelectrocatalytic degradation of methylene blue by Ru-TiO2 photoelectrode

The Ru-TiO_2 photoelectrode prepared by anodization method 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 concentration of Ru was 1% and the optimum calcination temperature was 600 ℃. With bias voltage of 0.2 V and pH of 5,methylene blue solution was decolored completely in 120 rain by Ru-TiO_2 photoelectrode under UV light(125 W). The photoelectrocatalytic degradation of methylene blue solution was experimentally demonstrated to follow the Langmuir-Hinshelwood kinetic model, the reaction rate constant k = 0. 781 mmol/(L ·min) and the adsorption constant K = 0. 225 L/mmol were determined.