三维电化学电催化降解1,4-二氧六环的工艺优化及反应机理  

Process Optimization and Reaction Mechanism of Three-Dimensional Electrochemical Electrocatalytic Degradation of 1,4-Dioxane

作　　者：王瑞 代智能 张文琪 傅海莹 何小松[2] WANG Rui;DAI Zhineng;ZHANG Wenqi;FU Haiying;HE Xiaosong(School of Environmental Science and Engineering,Xiamen University of Technology,Xiamen 361024,China;Chinese Academy of Environmental Sciences,Beijing 100012,China)

机构地区：[1]厦门理工学院环境科学与工程学院,福建厦门361024 [2]中国环境科学研究院,北京100012

出　　处：《厦门理工学院学报》2024年第3期81-87,共7页Journal of Xiamen University of Technology

摘　　要：通过三维(3D)电化学电催化降解1,4-二氧六环,以去除率为指标,对电压、电解质浓度、粒子投加量3个工艺参数进行优化,并推测该工艺降解1,4-二氧六环的主要反应机理。结果表明,工艺优化后的3D电化学体系提高1,4-二氧六环去除率,最高为84.87%,其去除1,4-二氧六环的最佳工艺条件为:电压10 V,粒子投加量20 g,电解质浓度0.015 mol·L^(-1);相较于二维(2D)电化学体系,3D电化学电催化的去除率提高了60.39%。此外,pH值对1,4-二氧六环去除效果的影响不明显。在3D电化学电催化过程中,羟基自由基(·OH)和过氧自由基(·O_(2)^(-))可能发挥重要作用,1,4-二氧六环通过开环、分解一系列连锁反应生成小分子酸,最终矿化成CO_(2)和H_(2)O。Voltage,electrolyte concentration and particle dosage were optimized for degradation of 1,4-dioxane by three-dimensional(3D)electrochemical electrocatalysis,and its main reaction mechanism estimated.The results show that the optimized 3D electrochemical system can improve the removal rate of 1,4-dioxane up to 84.87%,with the optimal process conditions of voltage at 10 V,particle dosage at 20 g and electrolyte concentration at 0.015 mol·L^(-1).This removal rate measures an increase of 60.39%compared with 2D electrochemical system.The effect of pH value on the removal effect of 1,4-dioxane was not obvious.In the 3D electrochemical electrocatalysis process,Hydroxyl radicals(·OH)and peroxyradicals(·O_(2)^(-))may play important roles.1,4-dioxane generates small acid molecules through a chain reaction of ring opening and decomposition,and finally mineralizes into CO_(2) and H_(2)O.

关 键 词：1 4-二氧六环 三维电化学 电催化 工艺优化 反应机理 

分 类 号：X523[环境科学与工程—环境工程] O646[理学—物理化学]