Retrograde adsorption isotherms: An impossible fact?

Retrograde adsorption isotherms: An impossible fact?

“Retrograde” adsorption isotherms have been reported, but seem to violate thermodynamics and would cause concentration steps to migrate against the direction of fluid-phase flow. In general, what appears to be retrograde behavior is caused by one or more additional, uncontrolled variables. This is i...

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Veröffentlicht in:Journal of Chromatography A 2005-06, Vol.1079 (1), p.77-79
1. Verfasser: Helfferich, Friedrich G.
Format: Artikel
Sprache:eng
Schlagworte:
Adsorption
Adsorption isotherms
Ion Exchange Resins - chemistry
Retrograde adsorption behavior
Sodium - chemistry
Sulfonate adsorption
Sulfonic Acids - chemistry
Thermodynamics
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Zusammenfassung:“Retrograde” adsorption isotherms have been reported, but seem to violate thermodynamics and would cause concentration steps to migrate against the direction of fluid-phase flow. In general, what appears to be retrograde behavior is caused by one or more additional, uncontrolled variables. This is illustrated with adsorption of sulfonate on a weak-acid ion exchanger, where adsorption is accompanied by partial conversion of the ion exchanger to the sodium form.
ISSN:0021-9673
DOI:10.1016/j.chroma.2005.03.049