Details

Autor(en) / Beteiligte

• Kaibara, Kozue
• Inoue, Hiroyoshi
• Tsuruyama, Shigeru
• Kimizuka, Hideo

Titel

Study of Ion Transport across Amphoteric Ion-Exchange Membrane. V. Nonequilibrium Thermodynamic Analyses of Ion Selectivity

Ist Teil von

• Bulletin of the Chemical Society of Japan, 1988-05, Vol.61 (5), p.1517-1525

Ort / Verlag

Tokyo: The Chemical Society of Japan

Erscheinungsjahr

1988

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.