Preferential transport of nickel and cupric ions through cation exchange membrane in electrodialysis with a complex agent
✍ Scribed by Ting-chia Huang; Jau-Kai Wang
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 827 KB
- Volume
- 86
- Category
- Article
- ISSN
- 0011-9164
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✦ Synopsis
The preferential transport of nickel and cupric ions through cation exchange membranes was studied with electrodialysis in chloride solutions containing a complex agent. Citric acid and glycine were employed as complex agents in order to increase the permselectivity of metal ions. The experimental results show that the permselectivity coefficient, $A, increases as the stoichiometric ratio of a complex agent to metal ions, %, and the pH value of complex solutions increase, but decreases as the current density increases. Based on the Nernst-Planck equation and interfacial quasiequilibrium hypothesis, a theoretical approach is obtained from numerical calculation and found to be consistent with the experimental results as the current density ranging from O-l.5 mA/cm2 and 9 ranging from O-0.5.
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