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Effect of Al and Organic Acids on the Surface Chemistry of Kaolinite

Published online by Cambridge University Press:  28 February 2024

David B. Ward  and
Patrick V. Brady
David B. Ward
Affiliation:
Jacobs Engineering Group Inc., 2155 Louisiana Blvd. Suite 10000, Albuquerque, New Mexico 87110
Patrick V. Brady
Affiliation:
Geochemistry Research (MS 0750), Sandia National Laboratories, Albuquerque, New Mexico 87185
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Abstract

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The cause of pH and ionic strength-dependent proton and hydroxyl adsorption onto kaolinite is specific binding at edge Al and Si sites, and it can be modeled as a function of temperature with a triple layer model (TLM) of the mineral-solution interface. Exchange of Al for protons and hydroxyls is observed at low pH, with a stoichiometry approaching 1:3 (Al:H+). Adsorption of organic acids from dilute solutions depends on: 1) solution pH; 2) the functionality of the acid; and, to a lesser extent, 3) temperature. Such adsorption may occur primarily at Al sites exposed on kaolinite edges, as indicated by sorption experiments on the constituent oxides, where negligible sorption was observed on SiO2 (quartz), but was significant on Al2O3 (corundum) surfaces. Under similar conditions, oxalate adsorbs more strongly than acetate or formate to aluminol sites.

Keywords

AluminumOrganic AcidsOxalateSurface Change
Type
Research Article
Information
Clays and Clay Minerals , Volume 46 , Issue 4 , August 1998 , pp. 453 - 465
Copyright
Copyright © 1998, The Clay Minerals Society

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