Abstract
Abstract The transport characteristics of an amphoteric ion-exchange membrane were examined by electrochemical measurements for a multi-ionic system, in which NH4Cl and tetraalkylammonium chloride (TAA·Cl) solution phases are divided by the membrane phase. Membrane permeability values were estimated for two cations, NH4+ and TAA+, and Cl−, as well as for whole cations as an averaged quantity describing the cation transport process relative to the anion transport process. The present study indicated that ion-sieve permeation characteristics, which have been demonstrated as a fundamental transport mechanism across an amphoteric ion-exchange membrane in the concentration-cell systems, still play a dominant role in the multi-ionic system. Satisfactory linear relationships of the logarithmic membrane permeabilities to NH4+, Cl−, and a series of TAA+ ions against the hydrated ionic radii of respective ions were obtained. This linear relation was not affected appreciably by the combination of electrolytes separated by the membrane. Thermodynamic analyses on the multi-ionic transport across an amphoteric ion-exchange membrane contribute to improve the selective performances of membrane materials and to survey more efficient operating conditions of the membrane processes.
Published Version
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