• 关键词：铁屑  内电解  EDTA  络合铜  去除

• 基金项目：国家“水体污染控制和治理”重大科技专项(No.2009ZX07211-005)

• 鞠峰
• 华南理工大学环境科学与工程学院, 广州 510006

• 胡勇有
• 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

• 程建华
• 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

• 伍健东
• 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

• 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.

• Abstract：The removal of copper from EDTAsolution 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 pHrange of 2.0～11.0,lower solution pHwas favorable for copper removal;solution pHincreased 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-EDTAwas 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.

• Key words：iron chip  inner-electrolysis  EDTA  chelated copper  removal

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