PAn/PMo12膜修饰电极测定水体化学需氧量的应用研究  

A Study on Appl ication of a POIyaniline-Phosphato-MOlybdic Acid Modified Electrode to Determination of Chemical Oxygen Demand

作　　者：郑蕾[1] 李洛平[1] 金利通[1] 施国跃[1] 李嘉庆[1] 

机构地区：[1]华东师范大学化学系

出　　处：《上海环境科学》2005年第6期253-256,共4页Shanghai Environmental Sciences

基　　金：国家自然科学基金,编号:20327001

摘　　要：用电聚合方法制备了聚苯胺掺杂磷钼杂多酸（PAn／PMo12）膜修饰电极，该电极对溶液中的碘酸根（103-）离子有好的电流响应，并构建了纳米TiO2-KIO3光催化氧化协同体系降解水体中的有机物。用修饰电极测定在光催化降解水样过程中10^-3浓度的变化，进而建立了测定水样中化学需氧量（COD）的新方法。研究结果表明，在50～500mg／L COD的范围内，电流响应与标准水样中的COD值成良好的线性关系，检出限为20mg／L。本方法具有快速、简便、环境友好等优点，将本方法与COD国家标准分析法比对具有好的相关性。A glassy carbon electrode modified with polyaniline-phosphato-molybdic acid （PAn/PMo12） was prepared. This modified electrode can act as a sensor to determine the concentration of iodate resulting from photocatalytic oxidation of organic compounds by using a nano TIO2-IO3- system. The concentration change of IO-3 is proportional to the chemical oxygen demand （COD） level of the samples. Therefore, this modified electrode can be used to determine COD. The linear response is in the range of 50 - 500 mg COD/L, and the detection limit was 20 mg/L. The use of the proposed modified electrode to determine COD is simple, quick and environmentally friendly, and the results are also in good agreement with those from the national standard method for COD determination.

关 键 词：化学需氧量 聚苯胺掺杂磷钼杂多酸 光催化氧化 碘酸钾 

分 类 号：X832[环境科学与工程—环境工程] O646.54[理学—物理化学]