Study of electrodialysis of a copper chloride solution at overlimiting currents


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The electrodialysis of a 0.005 M copper(II) chloride solution simulating electroplating wastewater has been studied. Exceeding the limiting current on an MK-40 cation-exchange membrane leads to the precipitation of copper hydroxide on the membrane surface, which acidifies the solution in the concentration compartment by catalyzing the water dissociation reaction. It has been shown that an MA-40 membrane sorbs up to 15 wt % copper as a result of complexation with functional groups. During the electrodialysis at overlimiting currents, the MA-40 membrane becomes a source of protons to the desalting compartments and the membrane resistance increases because of the formation of copper hydroxide and/or oxide in large pores.

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E. Zhelonkina

Vyatka State University

编辑信件的主要联系方式.
Email: vgu_tep@mail.ru
俄罗斯联邦, Kirov

S. Shishkina

Vyatka State University

Email: vgu_tep@mail.ru
俄罗斯联邦, Kirov

I. Mikhailova

Vyatka State University

Email: vgu_tep@mail.ru
俄罗斯联邦, Kirov

B. Ananchenko

Vyatka State University

Email: vgu_tep@mail.ru
俄罗斯联邦, Kirov

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