铁屑内电解法处理EDTA溶液中络合铜离子  

Treatment of chelated copper in EDTA solution by iron chip inner-electrolysis

作　　者：鞠峰[1] 胡勇有[1,2,3] 程建华[1,2] 伍健东[1,2] 

机构地区：[1]华南理工大学环境科学与工程学院,广州510006 [2]工业聚集区污染控制与生态修复教育部重点实验室,广州510006 [3]制浆造纸工程国家重点实验室,广州510640

出　　处：《环境科学学报》2011年第5期897-904,共8页Acta Scientiae Circumstantiae

基　　金：国家"水体污染控制和治理"重大科技专项(No.2009ZX07211-005)~~

摘　　要：采用批式试验和现代仪器分析研究了铁屑内电解法处理EDTA溶液中络合铜离子,考察了溶液浓度、溶液pH、温度和铁屑粒径等因素对铜离子去除过程的影响.结果表明,铜离子去除过程符合表观一级动力学方程.在pH2.0～11.0范围内,pH值越低越利于铜离子去除;在酸性条件下溶液pH随内电解进行升高,在碱性条件下溶液pH随内电解进行降低.EDTA络合铜浓度过高和铁屑粒径过大都不利于铜离子去除.在288～318K范围内,提高温度可提高反应速率;表观反应活化能为26.57kJ·mol-1,反应过程受化学反应控制.经铁屑内电解法处理后EDTA络合铜最终转变为Fe(Ⅲ)-EDTA,该过程涉及铁屑置换还原,铁离子置换沉淀作用,电附集和吸附共沉淀等作用.The removal of copper from EDTA solution by iron chip inner-electrolysis was studied using a batch method and modern instruments.The effects of EDTA-Cu concentration,solution pH,reaction temperature and iron chip diameter on copper removal were investigated.The results showed that chelated copper removal by iron chip inner-electrolysis followed pseudo first-order kinetics.In the pH range of 2.0~11.0,lower solution pH was favorable for copper removal;solution pH increased over time under acidic conditions,and decreased over time under alkaline conditions.Too high EDTA-Cu concentration and too large iron diameter were disadvantageous to copper removal.At the reaction temperature of 288~318 K,increased temperature led to faster copper removal.The apparent activation energy was 26.57 kJ · mol-1,indicating that copper removal was controlled by a chemical process.After treatment by iron chip inner-electrolysis,Cu-EDTA was converted into Fe（Ⅲ）-EDTA,and this process involved the combined effects of Fe3＋ replacement-precipitation,Fe0 replacement reduction,electro-deposition,adsorption and co-precipitation.

关 键 词：铁屑 内电解 EDTA 络合铜 去除 

分 类 号：X703.1[环境科学与工程—环境工程]