The Correlation between the Water Content and Electrolyte Permeability of Cation-Exchange Membranes


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Izquierdo Gil, María Amparo and García Villaluenga, Juan Pedro and Muñoz San Martín, Sagrario and Barragán García, Vicenta María (2020) The Correlation between the Water Content and Electrolyte Permeability of Cation-Exchange Membranes. International Journal of Molecular Sciences, 21 (16). ISSN 1422-0067

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The salt permeability through three commercial cation-exchange membranes with different morphologies is investigated in aqueous NaCl solutions. Ion-exchange membranes (IEMs) find application in different processes such as electrodialysis, reverse osmosis, diffusion dialysis, membrane electrolysis, membrane fuel cells and ion exchange bioreactors. The aim of this paper is the experimental determination of the electrolyte permeability in the following membranes: MK-40 membrane, Nafion N324 membrane and Nafion 117 membrane. The latter is selected as being a reference membrane. The effect of an increase in the NaCl concentration in the solutions on membranes transport properties is analyzed. With regard to membranes sorption, a decrease in the water content was observed when the external electrolyte concentration is increased. Concerning permeation through the membranes, the salt permeability increased with concentration for the Nafion 117 membrane and remained nearly constant for the other two membranes. A close relation between the degree of liquid sorption by the membranes and the electrolyte permeability was observed.

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The authors of this study gratefully acknowledge financial support from Banco de Santander and Universidad Complutense de Madrid under Projects PR26-16-20296 and PR75/18-21589.

Uncontrolled Keywords:Transport characteristics; Ion; Diffusion; Electrodialysis; Coefficients; Nafion-117; Contact
Subjects:Sciences > Physics > Thermodynamics
ID Code:62682
Deposited On:30 Oct 2020 09:45
Last Modified:30 Oct 2020 10:05

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