一种新的光催化氧化体系用于化学需氧量的测定研究  

Determination of Chemical Oxygen Demand with a New Photocatalytic Oxidation System

作　　者：艾仕云[1] 李嘉庆[1] 杨娅[1] 柴怡浩[1] 孙郑冬[1] 金利通[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《高等学校化学学报》2004年第5期823-826,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号 :2 0 3 2 70 0 1);上海市科学技术委员会纳米科学技术专项基金(批准号:0 3 5 9nm 0 0 2 )资助

摘　　要：基于 KMn O4 能获得光生电子从而提高半导体光催化氧化能力的原理 ,建立了一种用纳米 Zn O-KMn O4 协同体系光催化测定化学需氧量 ( COD)的新方法 ,探讨了催化氧化测定 COD的机理 ,考察了测定COD的最佳反应条件 .COD值浓度在 1 .5～ 1 0 mg/L范围内与信号呈良好的线性关系 ,检测限为 0 .5 mg/L.用本方法测定实际水样 ,结果和标准高锰酸盐指数法 ( CODMn法 )A new photocatalytic method for the determination of chemical oxygen demand(COD) using nano ZnO-KMnO 4 co-existed system is described. The measuring principle is based on the fact that KMnO 4 acts as an acceptor of photogenerated electrons and then increases the rate of photocatalytic oxidation of organic compounds. The optimized operation conditions were selected and the photocatalytic oxidation mechanism was discussed. It is indicated that this method has mild operation conditions, it won′t cause secondary pollution, and can realize rapid and accurate determination of COD of surface water and drinking water. The application range is 1.5—10 mg/L and the lowest detection limit is 0.5 mg/L. The method was also applied to determining COD of real water samples. The results were in good agreement with those from the conventional methods(permanganate index method).

关 键 词：光催化氧化体系 化学需氧量 纳米氧化锌 高锰酸盐 测定方法 废水 

分 类 号：X132[环境科学与工程—环境科学]