Study of ion transport across amphoteric ion-exchange membrane. V. Nonequilibrium thermodynamic analyses of ion selectivity.
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概要
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Ion-transport processes across an amphoteric ion-exchange membrane were investigated by means of estimating the membrane permeability matrix, a set of modified linear phenomenological coefficients, from the electrochemical and the ion flux data. Systematic comparisons of phenomenological analyses on an amphoteric ion-exchange membrane system with those on an ordinary cation-exchange membrane system were carried out to investigate the correlations of singly- and binary-charged membrane structures to characteristic transport properties. The modes of ion permselectivity of an amphoteric ion-exchange membrane in the metal chloride concentration-cell systems are characterized by the potentiometric selective response due to the ion-sieve effect, the low membrane conductance, and the large ion flux, while those of an ordinary cation-exchange membrane are characterized by the totally charge-dependent potential response, the high conductance, and the extremely small ion flux. The cross elements of the membrane permeability matrix, which represent the partial contributions of cation-anion interactions to the membrane permselectivity, are positive for an amphoteric membrane and negative for a cation-exchange membrane. The positive cross matrix elements act deceleratively on the membrane permeability, whereas the negative elements do acceleratively. It was pointed out based on the nonequilibrium thermodynamic theory that the preferable and efficient permeation mechanism is the simple diffusion process in an amphoteric ion-exchange membrane, whereas the electroconductive process in a cation-exchange membrane.
- 公益社団法人 日本化学会の論文
著者
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Kaibara Kozue
Department Of Biological Substances And Life Science Faculty Of Engineering Kyushu Kyoritsu Universi
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Kimizuka Hideo
Department of Chemistry Faculty of Science Kyushu University
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Tsuruyama Shigeru
Department of Chemistry, Faculty of Science, Kyushu University
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Inoue Hiroyoshi
Department of Chemistry, Faculty of Science, Kyushu University
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