Sorption of Water at High Temperatures on Certain Clay Mineral Surfaces. Correlation with Lattice Fluoride

W. T. Granquist and J. V. Kennedy
Mellon Institute, Pittsburgh, Pennsylvania 15213

Abstract: The sorption of water, at 490°C and ca. 23–24 torr, on clay mineral surfaces has been studied using thermogravimetry and infrared absorption spectroscopy. Results from a series of synthetic hectorites, with and without lattice fluoride (see Granquist and Pollack, 1960), point to the presence of F in the clay lattice as an important condition for the sorption. Similar studies on natural hectorite and montmorillonite, synthetic interstratified montmorillonite/mica with and without fluoride, and Al2F6 support this interpretation of the role of the F ion and show that dioctahedral 2:1 clays sorb more water at 490°C than do trioctahedral 2:1 clays. The infrared spectra demonstrate that the sorbed water is for the most part hydrogen-bonded to the surface.

Clays and Clay Minerals; 1967 v. 15; no. 1; p. 103-117; DOI: 10.1346/CCMN.1967.0150111
© 1967, The Clay Minerals Society
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