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Residual Manganese(II) Entrapped in Single-Layer-Hydrate Montmorillonite Interlayers

Published online by Cambridge University Press:  28 February 2024

A. U. Gehring ,
I. V. Fry ,
T. Lloyd  and
G. Sposito
A. U. Gehring
Affiliation:
Department of Soil Science, University of California Berkeley, California 94720
I. V. Fry
Affiliation:
Department of Plant Biology, University of California Berkeley, California 94720
T. Lloyd
Affiliation:
Department of Soil Science, University of California Berkeley, California 94720
G. Sposito
Affiliation:
Department of Soil Science, University of California Berkeley, California 94720
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Abstract

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Electron paramagnetic resonance (EPR) and Fourier transform infrared (FTIR) spectroscopy in combination with X-ray diffractometry and thermal methods were used to determine the coordination of residual exchangeable Mn(II) in an untreated sample of Wyoming montmorillonite. At room temperature, Mn(II) in a single-layer-hydrate interlayer was proposed to be coordinated directly with oxygen ions of the siloxane surface on one layer and to form water bridges to the oxygens on the siloxane surface of the opposite layer. Dehydration and collapse of the interlayer entrapped and thereby stabilized the partially solvated Mn(II) up to 600°C. A change to Mn(II) in highly symmetric coordination occurred during dehydroxylation of the montmorillonite structure between 600°C and 700°C. Manganese(II) remained coordinated at the surface but positioned in a bicapped trigonal antiprism formed by oxygens of the silicate structure. This coordination was metastable at 800°C when the structural decomposition of the clay mineral began.

Keywords

Electron paramagnetic resonanceMn(II) coordinationMontmorillonite
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 5 , October 1993 , pp. 565 - 569
Copyright
Copyright © 1993, The Clay Minerals Society

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