酚类废水在活性炭纤维三维电极反应中的吸附-降解研究  

Electrooxidative Degradation of Phenolic Wastewater in Three-dimensional Electrode Reaction System of Activated Carbon Fibers

作　　者：刘晓艳 王蕊 杨艺 蔚梦蕊 张钰 马磊 刘伟军 Liu Xiaoyan;Wang Rui;Yang Yi;Wei Mengrui;Zhang Yu;Ma Lei;Liu Weijun(Ji’ning Water Resources Development Center of Shandong Province,Ji’ning 272100;Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology,School of Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102600;Shanxi Jiujiu Intelligent Technology Co.,Ltd.,Taiyuan 030045,China)

机构地区：[1]山东省济宁市水利事业发展中心,山东济宁272100 [2]北京石油化工学院化学工程学院,燃料清洁化及高效催化减排技术北京市重点实验室,北京102600 [3]山西九九智能科技有限公司,山西太原030045

出　　处：《广东化工》2021年第5期103-106,共4页Guangdong Chemical Industry

基　　金：大学生研究训练计划(URT)。

摘　　要：以活性炭纤维(ACF)和负载锰氧化物的活性炭纤维(MnOx/ACF)作为粒子电极构建三维电极体系,考察了酚类污染物在三维电极上的吸附和电氧化降解行为。电极表面形貌和结构的表征结果发现MnOx/ACF表面负载物为纳米颗粒且表面存在较少结构缺陷。接着研究了电极对酚类废水的吸附特性,发现随着酚类支链上氯原子数目的增加,电极吸附性能相应增强。电催化氧化降解实验结果表明,MnOx/ACF具有更强的电氧化能力,苯环上甲基取代基的存在有利于污染物的降解,氯取代基的存在不利于污染物降解,在pH=2.0,电流密度30 mA/cm2,30℃条件下反应180 min,间甲酚TOC去除率最高,可达80%。采用前线分子轨道理论对酚类物质在三维电极体系中的降解过程进行了理论解释。Activated carbon fiber(ACF) and manganese oxide-loaded activated carbon fiber(MnOx/ACF) were used as particle electrodes to construct a three-dimensional electrode system. The adsorption and oxidative degradation behavior of phenolic pollutants on the three-dimensional electrode were investigated. The characterization of the surface morphology and structure of the electrode showed that the surface attachment of MnOx/ACF was nano-particles and there were few structural defects on the surface. Then the adsorption capacity of the electrode for phenolic wastewater were studied. As the number of chlorine atoms in the phenolic branch increased, the adsorption performance of the electrode increased accordingly. Electrocatalytic oxidation degradation experiments show that MnOx/ACF has stronger electrooxidation ability than ACF. The presence of methyl substituents on the benzene ring was conducive to the degradation of pollutants, while the presence of chlorine substituents was not conducive to the degradation of pollutants. At pH=2.0, current density 30 mA/cm2, 30 ℃, the TOC degradation rate of m-cresol is the highest after 180 minutes, up to 80 %. The frontier molecular orbital theory was used to explain the degradation mechanism of phenolic substances in the three-dimensional electrode system.

关 键 词：三维电极 活性炭纤维 酚类 电催化氧化 

分 类 号：X5[环境科学与工程—环境工程]