基于光催化的化学需氧量测定研究进展

Research Progress on Determination Methods of Chemical Oxygen Demand Based on Photo Catalysis

化学需氧量(COD)作为废水有机物污染的综合指标,是水质监测的一个重要参数,但其常用的测定方法具有操作烦琐、分析时间长、成本高且二次污染严重的缺点。对近年来COD测定的改进方法进行了概述,主要介绍了基于光催化技术的测定COD的原理和新方法。这些方法以羟基自由基作为主要氧化剂与有机物发生反应为基础,具有快速、准确、低耗、无二次污染的优点。

As an integrated index representing the degree of organic pollution in wastewater,the chemical oxygen demand（COD） was a very important parameter in water quality monitoring.However,the determination methods of COD commonly used had several drawbacks,including inconvenient operating,time-consuming process,high costs and severe secondary pollution.The recent improvements on the determination methods of COD were reviewed briefly,while the principle and the new methods based on photo catalysis were introduced.These methods based on the reaction between the oxidant hydroxyl radicals and organic compounds were rapid,accurate,low cost and without secondary pollution.