Recovery of Cu and EDTA from EDTA-Cu Solution by use of Electrodialysis Accompanied by Electrochemical Reaction
Recovery of Cu and EDTA from EDTA-Cu Solution by use of Electrodialysis Accompanied by Electrochemical Reaction
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DOI：
10.5182/jaie.25.160
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Hiroshi Takahashi;Etsuko Kashiuchi;K. Munakata
中科院分区：
文献类型：
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作者：
Hiroshi Takahashi;Etsuko Kashiuchi;K. Munakata
乙二胺四乙酸（EDTA）与铜形成稳定的络合物。研究了电渗析处理结合电化学反应从络合物溶液中再生EDTA和Cu。电渗析堆由三个单元组成，两个单元包含阴极和阳极室，以及设置在单元之间的双极电极。单元中的细胞通过阳离子交换膜分离。利用电渗析技术成功地实现了EDTA和Cu的电化学再生。EDTA-Cu的消失速率和EDTA的形成速率几乎与电流密度成正比。阴极上的Cu沉积也进行得很好。实验还进行了使用电渗析与双极电极在堆栈中，和EDTA的形成和EDTA-Cu消失的速率比那些为单一的单元实验，并增加与电流密度。在阴极上的电化学反应的电流效率接近100%，并且在所采用的条件下，来自叠层中的双极电极的电流泄漏小得可以忽略。结果表明，电渗析与双极电极，使有效的再生铜和EDTA从复杂的解决方案。所有的实验结果进行了分析，使用一个数学模型，考虑阴极上的电化学反应，在阳离子交换膜的离子通量，和EDTA，EDTA-Cu，和钠的物质平衡。模拟结果与实验结果吻合较好。
Ethylenediaminetetraacetic acid (EDTA) forms a stable complex with copper. Electrodialysis treatment accompanied by electrochemical reaction was studied for the regeneration of EDTA and Cu from a solution of the complex. The electrodialysis stack consisted of three units of two cells containing cathode and anode compartments, and bipolar electrodes set between the units. The cells in a unit were separated by a cation-exchange membrane. Electrochemical reactions for the regeneration of EDTA and Cu were successfully achieved by electrodialysis with one unit in a stack. Both the rate of EDTA-Cu disappearance and the rate of EDTA formation were almost proportional to the current density. The Cu deposition on the cathode also proceeded well. Experiments were also conducted using electrodialysis with bipolar electrodes in a stack, and the rates of EDTA formation and EDTA-Cu disappearance were faster than those for the single unit experiments, and increased with the current density. The current efficiency of the electrochemical reaction on the cathode was close to 100%, and the current leakage from the bipolar electrode in the stack was negligibly small under the conditions employed. The results suggest that electrodialysis with bipolar electrodes enables the effective regeneration of Cu and EDTA from a solution of the complex. All the experimental results were analyzed using a mathematical model that considered electrochemical reaction on the cathode, ionic flux in the cation-exchange membrane, and the material balances of EDTA, EDTA-Cu, and sodium. The simulated results were in good agreement with the experimental results.