Regeneration of activated carbon adsorbed EDTA by electrochemical method  

吸附EDTA活性炭的电化学再生(英文)

作　　者：尤翔宇[1,2,3] 柴立元[1,2] 王云燕[1,2] 苏艳蓉[4] 赵娜[1,5] 舒余德[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083 [2]国家重金属污染防治工程技术研究中心,长沙410083 [3]湖南省环境保护科学研究院,长沙410004 [4]中机国际工程设计研究院有限责任公司,长沙410007 [5]长沙有色冶金设计研究院,长沙410011

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第3期855-860,共6页中国有色金属学报（英文版）

基　　金：Project(2011467062) supported by National Scientific Research Project of Welfare(Environmental) Industry,China;Project(50925417) supported by China National Funds for Distinguished Young Scientists;Project(50830301) supported by the National Natural Science Foundation of China;Project(CX2010B121) supported by Hunan Provincial Innovation Foundation For Postgraduate,China

摘　　要：Activated carbon after saturated adsorption of EDTA was used as particle electrode in a three-dimensional electrode reactor to treat EDTA-containing wastewater.Electrochemical method was used to regenerate activated carbon after many times of electrolysis.Based on the analysis of infrared spectra of activated carbon after adsorption and repeated electrolysis,EDTA was degraded into glycine,and then non-catalytic activated associated complex was formed with N—H bond on the activated carbon.The catalytic ability of the activated carbon vanished and the EDTA degradation efficiency was dropped.Activated carbon could be effectively regenerated by electrochemical method in the three-dimensional reactor.Effects of electric current,conductivity and pH on activated carbon regeneration were investigated,and the optimum conditions were concluded as follows：100-300 mA of current intensity,1.39 mS/cm of electric conductivity,60 min of electrolysis time and pH 6.0-8.0.Under the optimized conditions,the activity of the activated carbon can be recovered and the residual total organic carbon（TOC） was below 10 mg/L（the initial TOC was 200 mg/L） in the three-dimensional electrode reactor.采用吸附饱和EDTA的活性炭作为三维电极反应器中的粒子电极,多次使用后采用电化学方法对其再生。通过对吸附饱和EDTA的活性炭和多次电解使用后的活性炭的红外光谱谱图的分析得出,EDTA被活性炭吸附后产生甘氨酸H2NCH2COOH,通过N—H键生成一种永久性占据活性炭活性点的非催化活性缔合物,导致其催化活性消失,降解效率下降。采用电解方法使活性炭再生,得出活性炭的最佳活化条件为:电流100～300mA,溶液电导率1.39mS/cm,pH值6.0～8.0,电解1h可以使活性炭恢复活性,电解后有机物的残余TOC浓度低于10mg/L(初始浓度为200mg/L)。

关 键 词：activated carbon electrochemical regeneration three-dimensional electrode EDTA 

分 类 号：X703[环境科学与工程—环境工程]