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Modeling Boron Adsorption on Kaolinite

Published online by Cambridge University Press:  28 February 2024

Shivi P. N. Singh  and
Shas V. Mattigod
Shivi P. N. Singh
Affiliation:
United Engineers and Constructors, Denver, Colorado 80217
Shas V. Mattigod
Affiliation:
Pacific Northwest Laboratories, Battelle, Richland, Washington 99352
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Abstract

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Boron adsorption at constant ionic strength [0.09 ± 0.01 moles/liter of KClO4 or Ca(ClO4)2] on 0.2−2 μm clay fraction of pretreated kaolinite was modeled using both phenomenological equations and surface complexation reactions. Phenomenological equations were expressed as linear relationships between the distribution coefficient and adsorption density or equilibrium concentration. The normalized form of the isotherms allowed the distribution coefficient to be predicted over a wide range of adsorption densities or equilibrium concentrations and pH. The Langmuir isotherm revealed a weak two-part linear trend supported by a similar behavior of the van Bemmelen-Freundlich isotherm. Potential adsorption mechanisms were assessed from these isotherms. The bases for the inner-sphere (surface coordination) and outer-sphere (ion-pair) surface reactions were postulated, and equations were developed and incorporated into the generalized triple-layer surface-complexation model [TL(g)-SCM]. Boron adsorption was best modeled using the inner-sphere complexes. The results confirm that the generalized triple-layer surface-complexation model can provide information regarding plausible reactions at the substrate/aqueous interface. Intrinsic constants for postulated surface reactions were derived as fitting parameters over a range of pH and initial boron concentrations.

Keywords

AdsorptionBoronIon-pairIon-speciationKaoliniteSurface complexationTriple-layer model
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 2 , April 1992 , pp. 192 - 205
Copyright
Copyright © 1992, The Clay Minerals Society

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