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Abstract
Several commercial ion-exchange membranes (FumaTech, DuPont) were tested in the electrodialytic oncentration of NaOH solutions in the range 1–5 M. It was found that the FumaTech cation-exchange membrane showed better performance than the bilayer Nafion membranes (DuPont) because of lower diluting effect caused by the electro-osmotic flow. However, neither of the tested membranes showed high enough efficiency for a practical application. The experimental results were modeled using the extended Nernst-Planck and Donnan equations. It was found that the derived model with two fitted parameters (effective fixed-charge concentration, tortuosity-porosity factor) satisfactorily describes the investigated process in the concentration range 1–4 M.
Notes
a)To calculate CE, c was fitted by a rational (long time experiments) or linear (short time experiments) function of n F .