Ion selectivity and water dissociation in polymer bipolar membranes studied by membrane potential and current–voltage measurements

Abstract A polymer bipolar ion-exchange membrane consists of a layered structure involving one cation and one anion ion-exchange layer joined together in series. In this study, the ionic selectivity and water dissociation rate of six commercial bipolar membranes was evaluated from the measurements of the membrane potential in a concentration cell and the current–voltage curve in a four-point measuring cell. Bipolar membrane technology requires polymer membranes presenting high ion selectivities and water dissociation rates, and in this paper we have addressed the basic physico-chemical phenomena involved, both theoretically and experimentally. We have shown that the effects of the bipolar junction and the membrane fixed charge concentrations on the ion transport rates observed can be understood on the basis of simple concepts.

[1]  J. Manzanares,et al.  Membrane potential of bipolar membranes , 1996 .

[2]  Akihiko Tanioka,et al.  Effect of interface structure and amino groups on water splitting and rectification effects in bipolar membranes , 1997 .

[3]  François Lamarche,et al.  Effect of pH variation by electrodialysis on the inhibition of enzymatic browning in cloudy apple juice , 1998 .

[4]  Claude Gavach,et al.  Development of electrodialysis with bipolar membrane for the treatment of concentrated nitrate effluents , 1996 .

[5]  N. Lakshminarayanaiah,et al.  Transport phenomena in membranes , 1969 .

[6]  Salvador Mafé,et al.  Bipolar membranes under forward and reverse bias conditions. Theory vs. experiment , 1994 .

[7]  P. Ramirez,et al.  Electrochemical characterization of polymer ion-exchange bipolar membranes , 1997 .

[8]  R. Simons,et al.  Electric field effects on proton transfer between ionizable groups and water in ion exchange membranes , 1984 .

[9]  J. Krol.  Monopolar and bipolar ion exchange membranes , 1997 .

[10]  Raynald Labrecque,et al.  Effect of Number of Bipolar Membranes and Temperature on the Performance of Bipolar Membrane Electroacidification , 1997 .

[11]  Salvador Mafé,et al.  Electric field-assisted proton transfer and water dissociation at the junction of a fixed-charge bipolar membrane , 1998 .

[12]  Ricardo Alvarez,et al.  Salicylic acid production by electrodialysis with bipolar membranes , 1997 .

[13]  A. Mauro,et al.  Space Charge Regions in Fixed Charge Membranes and the Associated Property of Capacitance. , 1962, Biophysical journal.

[14]  H. Strathmann,et al.  Current‐voltage curves of bipolar membranes , 1992 .

[15]  Salvador Mafé,et al.  Electric field enhanced water dissociation at the bipolar membrane junction from ac impedance spectra measurements , 1998 .

[16]  M. Paleologou,et al.  Sodium recovery with chloride removal from electrostatic precipitator catch at coastal and/or closed-cycle mills using bipolar membrane electrodialysis , 1997 .

[17]  L. Bazinet,et al.  Comparison of Chemical and Bipolar-Membrane Electrochemical Acidification for Precipitation of Soybean Proteins , 1998 .

[18]  N. Gnusin,et al.  Dissociation of Water Molecules in Systems with Ion-exchange Membranes , 1988 .

[19]  Mitsuru Higa,et al.  Transport of Ions across Bipolar Membranes. 1. Theoretical and Experimental Examination of the Membrane Potential of KCl Solutions , 1995 .

[20]  R. Simons,et al.  Preparation of a high performance bipolar membrane , 1993 .

[21]  H. Strathmann,et al.  Theoretical and practical aspects of preparing bipolar membranes , 1993 .