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Multilayer Adsorption of Water by Kaolinite^{1, 2,}

ABSTRACT

The Frenkel-Halsey-Hill isotherm equation for multilayer adsorption was applied to water adsorption by various monoionic kaolinites at 10.0°C. The FHH Equation described water adsorption over a wide P/P₀ range in all systems. Li-kaolinite showed no evidence of ion hydration or capillary condensation up to P/P_o = 0.972 and was used to calculate free water adsorption in terms of statistical layers, n. The calculated multilayer adsorption isotherm for water was identical for Li-, Ca-, Ba-, and Al-kaolinites. The same isotherm also described water adsorption by Na-kaolinites up to P/P_o = 0.9 where ion hydration was initiated. A definite effect on the parameters of the FHH equation was found as the nature of the substrate surface was varied when water is used as the adsorbate.

¹ Contribution of the Department of Soils and Plant Nutrition, University of California, Davis.

² Support of this work by a grant (NSF-G 19897) from the National Science Foundation is gratefully acknowledged.

³ Assistant Soil Chemist, University of California, Davis.

Received for publication August 3, 1962. Accepted for publication September 19, 1962.