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Kinetic modeling and selectivity of anion exchange in Donnan dialysis.

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Title: Kinetic modeling and selectivity of anion exchange in Donnan dialysis.
Authors: Beck, Adam1 adam.beck@tu-harburg.de, Ernst, Mathias1
Source: Journal of Membrane Science. Apr2015, Vol. 479, p132-140. 9p.
Subjects: Ion exchange (Chemistry), Donnan equilibrium, Chemical kinetics, Dialysis (Chemistry), Comparative studies, Mass transfer
Abstract: The objective of this work was to compare selective sorption and transport behavior of a Selemion AMV membrane for different anions with a theoretically derived kinetic model describing the Donnan dialysis (DD) process. This analysis resulted in a suggested relation for the diffusivity of small ions through “nanochannels” of ion exchange membranes. Mass transfer through boundary layers and membrane diffusion were modeled on the basis of the Nernst–Planck equation by introducing constant diffusivity ratios between the exchanging counter ions. To indentify the kinetic and selectivity coefficients, DD batch experiments with sodium nitrate, sulfate or dihydrogen phosphate as feed electrolytes and sodium chloride as receiver electrolyte were conducted. The derived kinetic model simulated the measured concentration changes very precisely after fitting three concentration-independent parameters and the concentration-dependent permeability coefficient. The selectivity sequence was found to be nitrate>sulfate>dihydrogen phosphate>chloride, while this sequence is strongly connected to activity in solution and in the membrane. This influence was very significant for sulfate, which resulted in higher removal efficiency than expected. Regarding diffusivity the identified sequence was nitrate>sulfate>chloride>dihydrogen phosphate. These results led to a correlation that describes diffusivity of counter ions through nanochannels as a function of hydrated cross section area and valence. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Membrane Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 101118795
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  Data: Kinetic modeling and selectivity of anion exchange in Donnan dialysis.
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  Data: <searchLink fieldCode="AR" term="%22Beck%2C+Adam%22">Beck, Adam</searchLink><relatesTo>1</relatesTo><i> adam.beck@tu-harburg.de</i><br /><searchLink fieldCode="AR" term="%22Ernst%2C+Mathias%22">Ernst, Mathias</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Membrane+Science%22">Journal of Membrane Science</searchLink>. Apr2015, Vol. 479, p132-140. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Ion+exchange+%28Chemistry%29%22">Ion exchange (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Donnan+equilibrium%22">Donnan equilibrium</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+kinetics%22">Chemical kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Dialysis+%28Chemistry%29%22">Dialysis (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Comparative+studies%22">Comparative studies</searchLink><br /><searchLink fieldCode="DE" term="%22Mass+transfer%22">Mass transfer</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: The objective of this work was to compare selective sorption and transport behavior of a Selemion AMV membrane for different anions with a theoretically derived kinetic model describing the Donnan dialysis (DD) process. This analysis resulted in a suggested relation for the diffusivity of small ions through “nanochannels” of ion exchange membranes. Mass transfer through boundary layers and membrane diffusion were modeled on the basis of the Nernst–Planck equation by introducing constant diffusivity ratios between the exchanging counter ions. To indentify the kinetic and selectivity coefficients, DD batch experiments with sodium nitrate, sulfate or dihydrogen phosphate as feed electrolytes and sodium chloride as receiver electrolyte were conducted. The derived kinetic model simulated the measured concentration changes very precisely after fitting three concentration-independent parameters and the concentration-dependent permeability coefficient. The selectivity sequence was found to be nitrate>sulfate>dihydrogen phosphate>chloride, while this sequence is strongly connected to activity in solution and in the membrane. This influence was very significant for sulfate, which resulted in higher removal efficiency than expected. Regarding diffusivity the identified sequence was nitrate>sulfate>chloride>dihydrogen phosphate. These results led to a correlation that describes diffusivity of counter ions through nanochannels as a function of hydrated cross section area and valence. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Membrane Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.memsci.2014.12.037
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 9
        StartPage: 132
    Subjects:
      – SubjectFull: Ion exchange (Chemistry)
        Type: general
      – SubjectFull: Donnan equilibrium
        Type: general
      – SubjectFull: Chemical kinetics
        Type: general
      – SubjectFull: Dialysis (Chemistry)
        Type: general
      – SubjectFull: Comparative studies
        Type: general
      – SubjectFull: Mass transfer
        Type: general
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      – TitleFull: Kinetic modeling and selectivity of anion exchange in Donnan dialysis.
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            NameFull: Beck, Adam
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            NameFull: Ernst, Mathias
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              M: 04
              Text: Apr2015
              Type: published
              Y: 2015
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              Value: 479
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