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Vibrational Probe Studies of Water Interactions with Montmorillonite

Published online by Cambridge University Press:  28 February 2024

C. T. Johnston ,
G. Sposito  and
C. Erickson
C. T. Johnston
Affiliation:
Department of Soil and Water Science, University of Florida, Gainesville, Florida 32611
G. Sposito
Affiliation:
Department of Soil Science, University of California, Berkeley, California 94720
C. Erickson
Affiliation:
Department of Soil and Water Science, University of Florida, Gainesville, Florida 32611
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Abstract

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Interaction of water with montmorillonite exchanged with Na+, K+, Co2+, and Cu2+ cations as a function of water content was examined using an FTIR/gravimetric cell designed to collect spectroscopic and sorption data simultaneously. Correlation of water desorption isotherms with infrared spectra of the clay-water complex showed that the position of the HOH bending band of water decreased as a function of water content. The largest decreases in frequency were observed for Cu2+ and Co2+; smaller decreases were found for Na+ and K+. In addition, the molar absorptivity of sorbed water increased upon decreasing the water content. The decrease in frequency and the concomitant increase in molar absorptivity were attributed to polarization effects on the sorbed water molecules by exchangeable cations. The interference fringes of a self supporting clay film permitted d-spacings to be determined optically and, therefore, changes in frequency, molar absorptivity, and water sorption behavior to be related directly to changes in interlayer spacing. The d-spacings obtained from the interference fringes were consistently larger by approximately 0.5 Å than those determined using powder XRD.

Keywords

Cation exchangeDesorption isothermFTIRGravimetricMontmorillonitePhysisorptionWater
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 6 , December 1992 , pp. 722 - 730
Copyright
Copyright © 1992, The Clay Minerals Society

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