3D打印气体扩散电极产H2O2及其对焦化废水的处理研究  

Enhancement of H_2O_2 accumulationat gas diffusion electrodes(GDEs) optimized by 3D-printed technique and its utilization in electro-Fenton for coking wastewater treatment

作　　者：邱珊 高伟杰[1,2] 邓凤霞 朱英实 马放[1,2] 杨基先 QIU Shan;GAO Wei-jie;DENG Feng-xia;ZHU Ying-shi;MA Fang;YANG Ji-xian(School of Environment,Harbin Institute of Technology,Harbin 150090,China;State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]哈尔滨工业大学环境学院,黑龙江哈尔滨150090 [2]哈尔滨工业大学,城市水资源与水环境国家重点实验室,黑龙江哈尔滨150090

出　　处：《中国环境科学》2018年第11期4075-4084,共10页China Environmental Science

基　　金：城市水资源与水环境国家重点实验室自主课题(HCK201708);国家重点研发计划项目(2016YFC0401102).

摘　　要：利用3D打印技术设计出一种高效产H_2O_2的3D打印气体扩散电极(3D-GDE)并将其应用于电芬顿体系对实际焦化废水降解研究.结果表明3D-GDE阴极H_2O_2产量高达16.1mgH_2O_2/cm2,而相同条件下传统气体扩散电极仅为7.16mgH_2O_2/cm2.通过考察不同因素对阴极产H_2O_2影响可知:酸性条件更有利于产H_2O_2;电流从200mA提高到250mA,其H_2O_2产量从250mg/L提高到450mg/L,但是继续提高电流时(250～300m A),H_2O_2并没有明显增加.将3D-GDE电极应用于电芬顿对实际焦化废水处理,在最适宜条件下,可以实现对焦化废水有效矿化(4h电解后高达80%),其降解过程中三维荧光指纹分析也直接证明了该体系的高效性.Microtox毒性实验表明,3D-GDE电芬顿体系可以有效的降低焦化废水体系的毒性,其最低能耗为0.9kW·h/g TOC.In this study,3D-printed GDE(3D-GDE)with a high H2O2 generation rate was designed using a three-dimensional printing approach and its application in electro-Fenton for coking wastewater treatment.Results showed that H2O2 reached 16.1mg H2O2/cm2,which was superior to the conventional gas diffusion electrode in the absence of the 3D-printedstructure with 7.16mg H2O2/cm2 H2O2 capacity under the same conditions.Moreover,it showed acid condition was favorable for the H2O2 production,and H2O2 generation rose from 250mg/L to 450mg/L as current increased from 200mA to 250mA.However,a further enhancement in current failed to improve H2O2 generation capacity.The proposed system was used for coking wastewater treatment following the optimization of the operating factors.Mineralization rate of coking wastewater could reach as high as 80%in 4h electrolysis by the 3D-GDE electro-Fenton process.Moreover,three-dimensional fluorescence method confirmed the effectiveness of the process in a direct approach.Microtox toxicity results revealed that the 3D-GDE electro-Fenton process was effective for coking wastewater detoxification and the lowest energy consumption for coking wastewater was calculated as 0.9kW·h/g TOC.

关 键 词：3D打印技术 气体扩散电极 电芬顿 苯酚 焦化废水 MICROTOX 

分 类 号：X703[环境科学与工程—环境工程]