铁屑内电解法处理EDTA溶液中络合铜离子

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铁屑内电解法处理 EDTA 溶液中络合铜离子
1 1, 2, 3, * 2 1, 2 ,程建华1 , , 鞠峰 ,胡勇有 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 3. 制浆造纸工程国家重点实验室, 广州 510640 收稿日期: 2010-10-20 修回日期: 2010-11-20 录用日期: 2010-12-08
第 31 卷第 5 期 2011 年 5 月
环 境 科 学 学 报 Acta Scientiae Circumstantiae
Vol. 31 , No. 5 May, 2011
J] . 环境科学学报, 31 ( 5 ) : 897-904 鞠峰,胡勇有,程建华, 等. 2011. 铁屑内电解法处理 EDTA 溶液中络合铜离子[ Cheng J H,et al. 2011. Treatment of chelated copper in EDTA solution by iron chip innerelectrolysis[J] . Acta Scientiae Circumstantiae, Ju F,Hu Y Y, 31 ( 5 ) : 897-904
Abstract: The removal of copper from EDTA solution by iron chip innerelectrolysis was studied using a batch method and modern instruments. The effects of EDTACu concentration, solution pH, reaction temperature and iron chip diameter on copper removal were investigated. The results showed that chelated copper removal by iron chip innerelectrolysis followed pseudo firstorder kinetics. In the pH range of 2. 0 11. 0 ,lower solution pH was 318 K,increased favorable for copper removal; solution pH increased over time under acidic conditions,and decreased over time under alkaline conditions. Too high EDTACu concentration and too large iron diameter were disadvantageous to copper removal. At the reaction temperature of 288 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 innerelectrolysis,CuEDTA was converted into Fe( Ⅲ) EDTA,and this process involved the combined precipitation,Fe0 replacement & reduction,electrodeposition,adsorption and coprecipitation. effects of Fe3 + replacementKeywords: iron chip; innerelectrolysis; EDTA; chelated copper; removal
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 pH 2. 0 288 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 318 K 范围内, ·mol - 1 , 提高温度可提高反应速率; 表观反应活化能为 26. 57 kJ 反应过程受化学反应控制. 经铁屑内电解法处理后 EDTA EDTA, 络合铜最终转变为Fe( Ⅲ) 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. 关键词: 铁屑; 内电解; EDTA; 络合铜; 去除 2468 ( 2011 ) 05-897-08 文章编号: 0253中图分类号: X703. 1 文献标识码: A
Treatment of chelated er in EDTA solution by iron chip innerelectrolysis
JU Feng1 ,HU Yongyou
1, 2, 3, *
, CHENG Jianhua
1, 2
2 , WU Jiandong1,
1. School of Environmental Science and Engineering,South China University of Technology,Guangzhou 510006 2. The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education,Guangzhou 510006 3. State Key Laboratory of Pulp and Paper Engineering,Guangzhou 510640 Received 20 October 2010 ; received in revised form 20 November 2010 ; accepted 8 December 2010
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