Comparison between Maxwell-Stefan and Nernst-Planck Equations to Describe Ion Exchange in Microporous Materials

Abstract:

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Two models comprising external and intraparticle mass transfer resistances developed to describe ion exchange in microporous materials are compared. Maxwell-Stefan and Nernst-Planck equations account for both concentration and electric potential gradients. However, under certain conditions, Maxwell-Stefan approach can be more advantageous particularly due to taking into account ion-ion and ion-solid interactions separately. The models were tested and compared with data available in the literature, namely batch experiments on cadmium (II) removal from aqueous solution using ETS-4 microporous titanosilicate. Calculated results reveal both models provide good and similar representations as well as fine predictive capability. Therefore, under the conditions investigated, both models can be successfully applied to describe intraparticle ionic transport.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 273-276)

Edited by:

Andreas Öchsner and Graeme E. Murch

Pages:

776-781

DOI:

10.4028/www.scientific.net/DDF.273-276.776

Citation:

P. F. Lito and C. M. Silva, "Comparison between Maxwell-Stefan and Nernst-Planck Equations to Describe Ion Exchange in Microporous Materials", Defect and Diffusion Forum, Vols. 273-276, pp. 776-781, 2008

Online since:

February 2008

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$35.00

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