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Quinoline Sorption on Na-Montmorillonite: Contributions of the Protonated and Neutral Species

Published online by Cambridge University Press:  02 April 2024

Calvin C. Ainsworth ,
John M. Zachara  and
Ron L. Schmidt
Calvin C. Ainsworth
Affiliation:
Battelle, Pacific Northwest Laboratories, P.O. Box 999, Richland, Washington 99352
John M. Zachara
Affiliation:
Battelle, Pacific Northwest Laboratories, P.O. Box 999, Richland, Washington 99352
Ron L. Schmidt
Affiliation:
Battelle, Pacific Northwest Laboratories, P.O. Box 999, Richland, Washington 99352
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Abstract

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Dilute aqueous solutions of quinoline were contacted with Na-montmorillonite to elucidate the sorption process of the neutral and protonated species. Sorption occurs via a combination of ion exchange and molecular adsorption and yields S-type isotherms. Exchange between the quinolinium ion (QH+) and Na can be described by means of Vanselow selectivity coefficients and a thermodynamic exchange constant (Kex). Due to the apparent adsorption of the neutral species at high mole fractions (x) of the solid phase, the thermodynamic standard state was defined as 0.5 mole fraction. The selectivity at pH ~4.95 of the QH+ species over Na (at XQH+ = 0.5) was determined to be Kv = 340. At pH ≥ 5.5 surface mole fractions of 0.5 could not be obtained without adsorption of the neutral species. This study suggests that at dilute solution concentrations quinoline is sorbed preferentially as the cation even at pHs ≫ pKa. A critical surface-solution concentration is apparently necessary for adsorption of the neutral species.

Keywords

AdsorptionCation exchangeMontmorilloniteQuinolineVanselow selectivity
Type
Research Article
Information
Clays and Clay Minerals , Volume 35 , Issue 2 , April 1987 , pp. 121 - 128
Copyright
Copyright © 1987, The Clay Minerals Society

References

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