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NMR spectroscopy of naturally occurring surface-adsorbed fluoride on Georgia kaolinite

Published online by Cambridge University Press:  01 January 2024

Stacey G. Cochiara  and
Brian L. Phillips
Stacey G. Cochiara
Affiliation:
Center for Environmental Molecular Science, Department of Geosciences, Stony Brook University, Stony Brook, NY 11794-2100, USA
Brian L. Phillips*
Affiliation:
Center for Environmental Molecular Science, Department of Geosciences, Stony Brook University, Stony Brook, NY 11794-2100, USA
*
* E-mail address of corresponding author: [email protected]
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Abstract

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Using 19F magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy, we show that most of the fluoride present in the KGa-lb reference kaolinite from Washington County, Georgia, occurs as a surface-adsorbed species bonded to Al. This surface fluoride can be removed from the <2 µm fraction by acid wash, but is largely retained in the coarse fraction. Correlation of integrated 19F NMR peak intensities with fluoride sorption experiments indicates a bulk F content of ∼144 ppm for KGa-1b, of which ∼30% substitutes for hydroxyl sites in the mineral structure and the remaining 70% occurs adsorbed on particle surfaces, corresponding to an edge surface fluoride density of ∼0.7 F− nm−2. 19F{27Al} TRAPDOR (TRAnsfer of Populations in DOuble Resonance) NMR data for the original kaolinite and for products of F− sorption experiments at pH 4 show that all of the observed 19F signals arise from fluoride bonded to Al atoms. Furthermore, bridging Al-F-Al sites and terminal Al-F give distinctly different TRAPDOR fractions allowing assignment of resolved peaks based on the number of Al in the first coordination sphere. This result was confirmed for fluoride adsorbed to the surface of gibbsite from aqueous suspension. No evidence was found for Si-F-type environments on the kaolinite surfaces.

Keywords

19F NMRFluorideGibbsiteKaoliniteSpectroscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 56 , Issue 1 , February 2008 , pp. 90 - 99
Copyright
Copyright © 2008, The Clay Minerals Society

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