滴流床生成双氧水及电-Fenton降解水中残留药物的研究

Electro-Fenton process can efficiently remove organic pollutants in water. In the process, cathode is a key factor determining the treatment effect. In the project, a trickle-bed cathode composed by graphite chips will be used to electro-generate hydrogen peroxide by oxygen reduction. The cathode has high generation rate of hydrogen peroxide and is easy to scale up. The study will mainly focus on the electro-generation mechanism of hydrogen peroxide in the trickle-bed cathode with three characteristic parameters, load density of graphite chips, electrolyte flow rate and oxygen containing gas flow rate. Therefore, the process of hydrogen peroxide electro-generation will be clarified. On this basis, an electro-Fenton system using the trickle-bed cathode will be constructed, and a model pharmaceutical i.e. diclofenac will be degraded by the electro-Fenton process. The project will compare the oxidation roles of hydroxyl radical, hydroperoxyl radical, hydrogen peroxide and anode; adsorption and reduction roles of the cathode in the electro-Fenton process. With the detection of intermediate products, degradation mechanism of diclofenac will be studied. The project has significant theoretical value and practical meaning for it will be helpful to better understand the electro-Fenton process using a trickle-bed cathode and to promote the practical application of the electro-Fenton process.

电-Fenton法能有效去除水中的有机污染物，阴极是影响去除效果的关键因素。本项目采用石墨粒子填充的滴流床阴极还原氧现场生成双氧水，速率高，易放大。研究滴流床特征参数影响滴流床阴极现场生成双氧水的作用机制，特征参数包括电极粒子填充密度、电解液流速和含氧气体流速。在此基础上，构建滴流床电-Fenton体系，降解水中的模型药物——双氯芬酸。比较电-Fenton体系中羟自由基、氢过氧自由基、双氧水和阳极的氧化作用及滴流床阴极的吸附与还原作用，结合降解中间产物的检测分析结果，研究双氯芬酸的降解机理。本项目有助于加深对滴流床电-Fenton法的理解，促进其实际应用，有重要的理论价值和实际意义。