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Simulation of the transport of ions against their concentration gradient across charged membranes

1988; Elsevier BV; Volume: 37; Issue: 3 Linguagem: Inglês

10.1016/s0376-7388(00)82432-1

1873-3123

Mitsuru Higa, Akihiko Tanioka, Keizo Miyasaka,

Electrochemical Analysis and Applications

In a multi-ionic system, changes in ion concentration in two cells containing strong- and weak-acid ion-exchange membranes were simulated as a function of time, to obtain the flux of each ion in the system from only the charge density and ion mobility in the membrane and the ion concentrations in the two cells. This enables a determination of how the concentrations of the other ions change if one ion is transported against its concentration gradient. From this, the mechanism of uphill ion transport across ion-exchange membranes is clarified. These phenomena are confirmed experimentally using cation-exchange and poly(vinyl alcohol) membranes. Although ion transport across ion-exchange membranes has formerly been explained as active transport by a proton jump mechanism and across poly(vinyl alcohol) membranes by ring opening/closing reactions, we will describe such transport in terms of uphill transport across a strong- and weak-acid ion-exchange membrane. The theoretical predictions coincide well with experimental data.