阴极阳极协同电催化降解高硫酸盐废水中活性染料  

Electrocatalytic degradation of reactive dyes in high sulfate wastewater by synergistic effect of anode and cathode

作　　者：刘楚楚 金春姬[1,2] 孙楠 高孟春[1,2] LIU Chuchu;JIN Chunji;SUN Nan;GAO Mengchun(School of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;The Key Laboratory of Marine Environment and Ecology,Ministry of Education,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学环境科学与工程学院,山东青岛266100 [2]中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100

出　　处：《工业水处理》2024年第4期127-137,共11页Industrial Water Treatment

基　　金：中央高校基本科研业务费专项(201964004)。

摘　　要：采用辊压法制备炭黑/聚四氟乙烯(C/PTFE)气体扩散电极,并对其微观结构进行表征。构建以掺硼金刚石(BDD)为阳极,C/PTFE气体扩散电极为阴极的电催化氧化体系,阳极硫酸盐活化技术与阴极原位合成H_(2)O_(2)技术协同处理高硫酸盐废水中的活性艳蓝X-BR。结果表明,制备的C/PTFE电极作阴极时,电催化氧化体系中活性艳蓝X-BR去除效果优于铂(Pt)阴极体系和不锈钢(SS)阴极体系。通过猝灭实验发现,BDD/(C/PTFE)电化学体系中产生的SO_(4)^(·-)和·OH等高活性物质间相互转化,为电化学体系提供了可持续氧化能力,二者对于体系中活性艳蓝X-BR去除贡献度分别为54.51%和25.75%。建立了电化学氧化体系中TOC去除率及单位能耗二次项模型,通过响应曲面法优化降解含活性艳蓝X-BR废水的运行参数。优化条件下(初始pH=5.0,电流密度=120 mA/cm^(2),C_(Na_(2)SO_(4))=0.25 mol/L,C_(活性艳蓝X-BR)=1 000 mg/L),电解120 min,废水TOC去除率为63.86%,体系单位质量TOC能耗为256.02kW·h/kg,继续电解至240 min,可将水中的活性艳蓝X-BR完全矿化,为双电极协同电催化氧化处理高硫酸盐有机废水提供理论支持。A carbon black/polytetrafluoroethylene(C/PTFE)gas diffuser electrode was prepared by the roller com-paction method and its micro-structure was characterized.An electrocatalytic oxidation system using a boron-doped diamond as anode and a C/PTFE gas diffuser electrode as cathode was constructed.The reactive brilliant blue X-BR in high sulfate wastewater was treated cooperatively by combining sulfate activation technology at anode with in-situ synthesis of H_(2)O_(2) technology at cathode.The results showed that when the prepared C/PTFE electrode was used as the cathode,the removal effect of active brilliant blue X-BR in electro-activated sulfate system was better than that in platinum(Pt)cathode system and stainless steel(SS)system.According to the quenching experiment,the inter-action between the highly active substances such as SO_(4)·-and·OH produced by the electrochemical system of BDD/(C/PTFE)provided the bulk sustainable oxidation capacity for the degradation of reactive brilliant blue X-BR,and the contribution of these two substances to the removal of active brilliant blue X-BR were 54.51%and 25.75%,respectively.A quadratic model of TOC removal rate and unit energy consumption in electrochemical oxidation sys-tem was established.The operational parameters of reactive brilliant blue X-BR degradation were optimized by ex-perimental design matrix.Under optimized conditions(initial pH=5.0,current density=120 mA/cm^(2),CNa_(2)SO_(4)=0.25 mol/L,Cactive brilliant blue X-BR=1000 mg/L),and electrolysis for 120 min,the removal rate of TOC in wastewater was 63.86% and the unit energy consumption of the system was 256.02 kW·h/kg.The reactive brilliant blue X-BR in water could be completely mineralized by continued electrolysis to 240 min.The results provide theoretical support for the dual-electrode collaborative electrocatalytic oxidation treatment of high sulfate organic wastewater.

关 键 词：电催化氧化 BDD阳极 C/PTFE气体扩散阴极 电活化硫酸盐 Doehlert响应曲面设计 

分 类 号：TQ426[化学工程] X703[环境科学与工程—环境工程]