The Effect of Cation Exchange of Tris(Ethylenediamine)Cobalt(III) for Sodium on Nitrogen Sorption by Montmorillonite

M. I. Knudson Jr. and J. L. McAtee Jr.
Baroid Division, NL Industries, Inc., P.O., Box 1675, Houston, Texas 77001, U.S.A.
Baylor University, Department of Chemistry, Waco, Texas 76703, U.S.A.

Abstract: The cation exchange process between tris(ethylenediamine)cobalt(III) and Na+ on montmorillonite was studied by atomic absorption spectrophotometry, X-ray diffraction, differential thermal analysis, and nitrogen sorption at 78°K The exchange of Co(en)33+ for Na+ was found to be extremely favorable, with a tendency toward segregation of the two kinds of cations in the mixed clays studied. Small amounts of Co(en)3+3 were found to lower the nitrogen sorption capacity of Na+ montmorillonite while clays with high Co(en)3+3 content had greatly enhanced sorption. An explanation is offered in terms of a dual role of the Co(en)3+3 in determining the kind and amount of nitrogen sorption in the exchanged montmorillonite.

Clays and Clay Minerals; February 1973 v. 21; no. 1; p. 19-26; DOI: 10.1346/CCMN.1973.0210105
© 1973, The Clay Minerals Society
Clay Minerals Society (www.clays.org)