亚甲基蓝溶液的光催化脱色及降解

Photocatalytic decoloration and degradation of methylene blue in TiO_2 suspension

以高压汞灯为光源、在自制TiO2纳米粉末悬浮体系内，以亚甲基蓝溶液光催化降解脱色反应为模型．研究了其脱色降解动力学及其影响因素。研究表明，亚甲基蓝光催化反应动力学常数为4.53μmol／L·min，吸附常数为33．55L/mmol；随着PH值的上升以及H2O2的加入，其脱色降解速率明显加快。离子色谱分析表明，光照40min后，亚甲基盔部分分解为Cl-、NH4+。

Photocatalytic decoloration and degradation of methylene blue ln TiO2, nanometer poweder suspension irradiated by high pressure mercury Iamp were investigated. And Langmuir Kinetics and the effects of H2O2 addition and different pH on the decoloration and degradation of methylene blue were studied in details. The resultsshowed that the rate constants and adsorption constants were 4. 53 μmol/ L· min and 33. 55 L/mmol respectivelyin the heterogeneous photocatalysis, and its rate of decoloration antl degradation went up slgnificantly with pH values rising and H2O2 addltion. Ion chromatography analyses showed that methylene blue was decomposed to formpartial Cl-, NH4-. SO4.