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Partial Stabilization of Fe(II) in Reduced Ferruginous Smectite by Li Fixation

Published online by Cambridge University Press:  28 February 2024

Peter Komadel ,
Jana Madejová  and
Joseph W. Stucki
Peter Komadel
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava, Slovakia
Jana Madejová
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava, Slovakia
Joseph W. Stucki
Affiliation:
Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, Illinois 61801, USA
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Abstract

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Partial stabilization of Fe(II) in chemically reduced smectite, which normally readily undergoes reoxidation in air, was achieved. The purpose of this study was to determine if Fe(II) can be stabilized in reduced smectites by Li fixation upon heating. More than 80% of total Fe in ferruginous smectite SWa-1 was reduced to Fe(II) using the citrate-bicarbonate-dithionite (CBD) method while purging the clay dispersion with N2. The reduced smectite was Li-saturated, washed free of excess ions, freeze-dried, and heated in N2 atmosphere at 260°C for 24 h to produce Li-fixation. This treatment caused partial stabilization of Fe(II) in the clay structure. Chemical analysis, Mössbauer spectroscopy, and Fourier transform infrared (FTIR) spectroscopy proved that <20% of total Fe was Fe(II) after reoxidation with oxygen in a water dispersion, a treatment which causes complete reoxidation of Fe(II) in reduced Na-smectites. Decomposition of the OH-stretching band evident in the IR spectra indicated migration of Li into the vacant octahedra. Some of the OH groups in the reoxidized smectite were found in local trioctahedral configurations, associated with the AlFe(II)Li or Fe(III)Fe(II)Li groupings of central atoms in the octahedral sheet.

Keywords

FerricFerrousFerruginous SmectiteInfrared SpectroscopyLi FixationMössbauer SpectroscopyOxidationReductionSWa-1
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 4 , August 1999 , pp. 458 - 465
Copyright
Copyright © 1999, The Clay Minerals Society

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