周期换向电化学协同PDS降解活性染料废水的作用机制  

Mechanism on the Degradation of Reactive Dye Wastewater by Periodically Electrochemical Cooperated with PDS

作　　者：孙兆楠[1] 时珂 刘欢 陈泓霏 邓浩宇 梁海 SUN Zhaonan;SHI Ke;LIU Huan;CHEN Hongfei;DENG HaoYu;LIANG Hai(Yingkou Institute of Technology,Liaoning Key Laboratory of Chemical Additive Synthesis and Separation,Yingkou 115014,China;Northeastern University,College of Resources and Civil Engineering,Shenyang 110819,China)

机构地区：[1]营口理工学院,辽宁省化学助剂合成与分离重点实验室,辽宁营口115014 [2]东北大学,资源与土木工程学院,辽宁沈阳110819

出　　处：《水处理技术》2022年第9期71-77,共7页Technology of Water Treatment

基　　金：城市水资源与水环境国家重点实验室开放基金(HC202152);辽宁省教育厅科学研究经费项目(L2020010);辽宁省“兴辽英才计划”(XLYC2007185);营口理工学院优秀科技人才支持计划(RC201905)。

摘　　要：随着电化学技术优势的凸显和过硫酸盐高级氧化技术(AOPS)研究的不断深入,电化学活化过硫酸盐降解技术在印染废水领域展现出巨大潜力。以活性黑KN-B(RB)为目标污染物模拟染料废水,开展周期换向电化学(PREC)协同过硫酸盐(PDS)体系降解RB模拟染料废水的影响因素及作用机制研究。结果表明:铁/铝为反应电极,PREC/PDS体系在反应电压(U)为2 V,过硫酸钠投加量为10 mmol/L,转速(v)为500 r/min,换向周期(T)为10 s,极板间距(d)为1 cm,pH约为4的条件下处理初始浓度为200 mg/L的RB模拟染料废水400 mL,反应10 min,脱色率可达98%以上,效果稳定,且符合准二级反应动力学。研究表明:RB的高效去除是活化PDS产生自由基强氧化作用和电化学综合作用的结果,其中SO_(4)^(-)∙氧化作用对脱色贡献率约为31%,∙OH的贡献率约为4%,金属离子的絮凝作用贡献率约为2%,其余可能包括阴极还原、H_(2)还原、[H]还原、电气浮等作用。通过紫外-可见光谱分析推断PREC/PDS体系对RB降解较为彻底,未有中间产物生成,为其进一步应用提供理论基础。With the advantages of electrochemical technology and deepening research of advanced oxidation technology of persulfate(AOPS),degradation technology of electrochemically activated persulfate has shown great potential in the field of treating organic wastewater.Activated black KN-B(RB)was used as the target pollutant to simulate dye wastewater,and the influencing factors and mechanism of the degradation for RB simulated dye wastewater by periodically reversing electrochemistry(PREC)cooperated with the persulfate(PDS)system were studied.The results showed that iron/aluminum was used as the electrodes,and the decolorization rate was more than 98%under the conditions of 2 V for the reaction voltage(U),10 mmol/L of the sodium persulfate dosage,500 r/min for the rotation speed,10 s of the reversing period(T),1 cm of the plate spacing(d),200 mg/L of the RB initial concentration,4 of the pH,and 10 min of the reaction time,which was stable and Conformed to quasi-second order reaction kinetics.The efficient removal of RB is the result of the strong oxidation of free radicals produced by activated PDS and the comprehensive action of electrochemistry.Among them,the contribution rate of SO_(4)^(-)·oxidation to decolorization is about 31%,the contribution of·OH is about 4%,the contribution of flocculation of metal ions is about 2%,and the rest may include cathodic reduction,H_(2) reduction,[H]reduction,electro-flotation,etc.UV-Vis spectrum analysis showed that the PREC/PDS system degraded RB thoroughly and no intermediate products were produced,which provided a theoretical basis for the further application.

关 键 词：周期换向 电化学 硫酸根自由基 印染废水 作用机制 

分 类 号：X703.1[环境科学与工程—环境工程]