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Protonation of Organic Bases in Clay—Water Systems

Published online by Cambridge University Press:  01 July 2024

Samuel W. Karickhoff  and
George W. Bailey
Samuel W. Karickhoff
Affiliation:
Environmental Research Laboratory, U.S. Environmental Protection Agency, Athens, Georgia 30601, U.S.A.
George W. Bailey
Affiliation:
Environmental Research Laboratory, U.S. Environmental Protection Agency, Athens, Georgia 30601, U.S.A.
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Abstract

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The extent of protonation of organic bases in clay—water systems depends upon the adsorptive properties of the organo-clay species involved, and upon the structure and degree of hydration of the clay system. Organic molecules that can disperse cationic charge over two or more condensed aromatic rings give rise to greater surface-induced protonation than do single-ring organic molecules with similar solution pKa. Protonation in clay suspensions is frequently far in excess of that predicted on the basis of electrolytic suspension pH and solution pKa of the organic base. For a given organic base, protonation in a clay film exceeds that in the suspended clay system. Protonation in an organo-clay film increases as the film moisture content decreases. The extent of protonation in organo—clay systems varies with cationic species, cationic saturation, and clay type.

Type
Research Article
Information
Clays and Clay Minerals , Volume 24 , Issue 4 , August 1976 , pp. 170 - 176
Copyright
Copyright © 1976 The Clay Minerals Society

Footnotes

*

Reference to trade names is for information only and does not constitute endorsement by the U.S. Environmental Protection Agency.

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