改性Ti/SnO_(2)-Sb电极降解EDTA-Ni电镀废水的试验及机理  

Mechanism and Experiment of Degradation of EDTA-Ni Electroplating Wastewater by Modified Ti/SnO_(2)-Sb Electrode

作　　者：赵鑫 马桂敏 尹娟 王正川 李赫龙 徐强 ZHAO Xin;MA Guimin;YIN Juan;WANG Zhengchuan;LI Helong;XU Qiang(Shenzhen Guanghuiyuan Environment Water Co.,Ltd.,Shenzhen 51801l,China;Guangdong Province Urban Water Environment and Water Information Engineering Technology Research Center,Shenzhen 518011,China)

机构地区：[1]深圳市广汇源环境水务有限公司,广东深圳518011 [2]广东省城市水环境与水务信息化工程技术研究中心,广东深圳518011

出　　处：《净水技术》2023年第S01期183-188,280,共7页Water Purification Technology

基　　金：深圳市技术攻关面上项目(JSGG20201102171401006)。

摘　　要：乙二胺四乙酸络合镍(EDTA-Ni)是镀镍废水中常见的有机重金属污染物,传统的处理技术难以实现对EDTA-Ni的深度破络和彻底净化。文章重点考察了电催化法对EDTA-Ni的氧化破络和还原脱除规律,对比研究了Ti/SnO_(2)-Sb、Ti/SnO_(2)-Sm-Sb、Ti/SnO_(2)-La-Sb电极对EDTA-Ni废水中络合态Ni的去除能力,并通过阴极表面Ni的特征谱图,证实了Ni的电化学还原行为。研究表明,改性Ti/SnO_(2)-Sb电极的析氧电位直接制约着EDTA-Ni废水中络合态Ni的去除效率。具有较高析氧电位的Ti/SnO_(2)-Sm-Sb、Ti/SnO_(2)-La-Sb电极电解30min即可去除90%以上的络合态Ni,降解反应速率是Ti/SnO_(2)-Sb电极的1.35、1.17倍。EDTA-Ni中的络合态Ni在电化学体系中能够被破络后阴极还原,并通过离子交换法及时从废水中分离回收。EDTA-Ni is a common organic heavy metal pollutant in nickel plating wastewater.Traditional wastewater treatment technology is difficult to achieve deep breaking ability and thorough purification of EDTA-Ni.In this paper,oxidative breakdown and reduction removal of EDTA-Ni by electrocatalysis was considered and explored.The removal ability of Ti/SnO_(2)-Sb,Ti/SnO-Sm-Sb,and Ti/SnOz-La-Sb electrodes in EDTA-Ni wastewater were studied in comparison.Electrochemical reduction behavior of Ni was verified by the characteristic spectrum of Ni on the surface of the cathode.Results showed that the oxygen evolution potential of the modified Ti/SnO_(2)-Sb electrode directly restricts the removal efficiency of complexed Ni in EDTA-Ni wastewater.More than 90%of the complexed Ni could be removed by electrolysis of Ti/SnO_(2)-Sm-Sb and Ti/SnO_(2)-La-Sb electrodes with high oxygen evolution potential for 30 min.The degradation reaction rates are 1.35 times and 1.17 times that of Ti/SnO,-Sb electrodes.The complexed state Ni in EDTA-Ni could be reduced by the cathode after breaking the network in the electrochemical system,and separated and recovered from the wastewater in time by ion exchange method.

关 键 词：电镀废水 锡锑电极 电催化 破络 析氧电位 

分 类 号：TQ09[化学工程]