Selective permeability of a perfluorosulphonic membrane to different valency cations. Ion-exchange isotherms and kinetic aspects
| Autor: | Gérald Pourcelly, Arlette Lindheimer, Sébastien Logette, Claude Gavach, Catherine Eysseric |
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| Přispěvatelé: | Veolia Environnement (FRANCE), Institut Européen des membranes (IEM), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM), Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 1998 |
| Předmět: |
Ion exchange
Chemistry Inorganic chemistry Ionic bonding Filtration and Separation 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry 0104 chemical sciences Ion Diffusion layer chemistry.chemical_compound Membrane Nafion [CHIM]Chemical Sciences General Materials Science Semipermeable membrane Physical and Theoretical Chemistry 0210 nano-technology ComputingMilieux_MISCELLANEOUS Ion transporter |
| Zdroj: | Journal of Membrane Science Journal of Membrane Science, Elsevier, 1998, 144 (1-2), pp.259-274. ⟨10.1016/S0376-7388(98)00062-3⟩ |
| ISSN: | 0376-7388 |
| Popis: | Transport competition between protons and Ag+, Co2+and Ce3+ ions across a Nafion™ cation exchange membrane (CEM) has been studied in the Donnan exclusion domain. In such conditions the membrane does not contain any mobile anion but only cations (the counter-ions) which electrically equilibrate the sulphonic sites. In the frame of the gel-model, the ion transport flux depends on both the composition of the membrane resulting from the solution–membrane exchange equilibrium and the mobility of the counter-ions within the membrane. As the charge of the ion increases, so does its affinity for the membrane which is greater for multivalent counter-ions than for protons due to their larger electrostatic attraction towards the exchange sites of opposite polarity. On the other hand, as the charge of the ion increases, its mobility in the membrane is reduced. Modelling of this transport takes into account these two aspects as well as ionic concentration variations in the diffusion layer. |
| Databáze: | OpenAIRE |
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