摘要
以碳纳米管膜电极为工作电极,建立三维电极过滤体系,对碳纳米管电极电化学氧化降解直接黑G(DBG)偶氮染料废水的特性进行了研究,探究了碳纳米管电极降解DBG染料废水的影响因素,并分析了降解机理。结果表明,不同水质条件(DBG初始浓度、电解质浓度、初始pH),不同运行条件(流量、阳极电势)均会影响碳纳米管电极降解DBG的效率,在DBG染料初始浓度为20 mg/L,电解质Na_(2)SO_(4)浓度为0.1 mol/L,阳极电势为2.0 V,初始pH为3.0,流量为10 mL/min的最佳运行条件下,以再循环式工作方式运行60 min, DBG去除率可达99.5%。循环伏安测试(CV)表明在碳纳米管表面发生了DBG直接氧化反应,淬灭剂实验表明DBG的降解还存在间接氧化作用。LC-MS分析表明,DBG在矿化过程中可能产生萘、间苯二胺、苯醌等中间产物。
A three-dimensional electrode filtration system was established using a carbon nanotube membrane electrode as working electrode to study the characteristics of electrochemical oxidation degradation of DBG azo dye wastewater by carbon nanotube electrode,explore the influencing factors of the degradation of DBG,and analyze the degradation mechanism.Results showed that different water quality conditions(DBG initial concentration,electrolyte concentration,initial pH),different operating conditions(flow rate,anodic potential)would affect the efficiency of DBG degradation.Under the optimal operating conditions of the initial concentration of DBG dye of 20 mg/L,electrolyte Na_(2)SO_(4) concentration of 0.1 mol/L,anodic potential of 2.0 V,initial pH of 3.0,the flow rate of 10 mL/min,and run in reciculating mode for 60 min,the DBG removal rate could reach 99.5%.Cyclic voltammetry(CV)results showed that direct oxidation of DBG occurred on the surface of the carbon nanotube,and quencher experiments showed that the degradation of DBG also had indirect oxidation.LC-MS analysis showed that DBG may produce naphthalene,m-phenylenediamine,benzoquinone and other intermediates in the mineralization process.
作者
吴昊
杨帆
李书豪
范舒婷
林少华
WU Hao;YANG Fan;LI Shuhao;FAN Shuting;LIN Shaohua(School of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)
出处
《应用化工》
北大核心
2025年第11期2781-2785,2791,共6页
Applied Chemical Industry
基金
国家自然科学基金(42077323)。
关键词
碳纳米管
三维电极
电化学过滤
直接黑G
偶氮染料
carbon nanotubes
three-dimensional electrode
electrochemical filtration
Direct Black G
azo dye
