Issue 7, 2005
From the journal:

New Journal of Chemistry

The crossed interdiffusion of sodium nitrate and sulfate through an anion exchange membrane, as studied by Raman spectroscopy

Patrice Huguet,*a   Timofei Kiva,b   Olivier Noguera,a   Philippe Sistata  and  Victor Nikonenkob  

* Corresponding authors

a Institut Européen des Membranes (CNRS UMR 5635), Université de Montpellier II CC047, Place Eugène Bataillon, Montpellier Cedex 5, France
E-mail: patrice.huguet@iemm.univ-montp2.fr
Fax: 33 (0)4 67 14 91 19
Tel: 33 (0)4 67 14 91 14

b Membrane Institute, Kuban State University, 149 Stavropolskaya st., Krasnodar, Russia
E-mail: v_nikonenko@mail.ru
Fax: 00 7 86 12 19 95 17
Tel: 00 7 86 12 19 95 73

Abstract

Raman spectroscopy is applied to visualize concentration profiles in solution adjacent to the top of DSV anion exchange membranes in horizontal positions. The concentration profiles of sulfates, nitrates and their fluxes through the membrane are recorded as a function of time during 13–15 h experiments. A three layer mathematical model based on extended Nernst–Planck equations with a convective term is developed. The membrane’s kinetic and static parameters, such as ionic diffusion and ion exchange coefficients, are determined by separate experiments. Only one parameter, the diffusion boundary layer thickness, δ, is fitted. It is found that the model described fluxes well, especially when the variation of δ is taken into account. At the same time, the model gives nearly linear concentration profiles, whereas the measured profiles are much more complicated. This complicated shape is explained by natural convection and the emergence of the Bènard vortexes in the system.

Graphical abstract: The crossed interdiffusion of sodium nitrate and sulfate through an anion exchange membrane, as studied by Raman spectroscopy

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Article information

DOI
https://doi.org/10.1039/B501257K
Article type
Paper
Submitted
25 Jan 2005
Accepted
18 Mar 2005
First published
09 Jun 2005

New J. Chem., 2005,29, 955-961

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The crossed interdiffusion of sodium nitrate and sulfate through an anion exchange membrane, as studied by Raman spectroscopy

P. Huguet, T. Kiva, O. Noguera, P. Sistat and V. Nikonenko, New J. Chem., 2005, 29, 955 DOI: 10.1039/B501257K

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