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Binary cation exchange in clinoptilolite involving K+, Na+ , Ba2+ and Ca2+ at 30 and 95°C: a calorimetric study

Published online by Cambridge University Press:  09 July 2018

N. Petrova ,
L. Filizova  and
G. Kirov
N. Petrova*
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 107 Sofia, 1113 Bulgaria
L. Filizova
Affiliation:
Dept. of Mineralogy, Petrology and Economic Geology, Sofia University, 15 Tzar Osvoboditel blvd, 1504 Sofia, Bulgaria
G. Kirov
Affiliation:
Dept. of Mineralogy, Petrology and Economic Geology, Sofia University, 15 Tzar Osvoboditel blvd, 1504 Sofia, Bulgaria
*
*E-mail: [email protected]
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Abstract

A binary ion exchange of cationic pairs involving K, Na, Ba and Ca in clinoptilolite was investigated calorimetrically. The selected cations included two pairs equal in charge and two pairs similar in size. The heats of ion exchange and the degrees of exchange were determined at 30 and 95°C. The data obtained are discussed with respect to cationic interactions in the clinoptilolite structure and hydration characteristics (heats of hydration and hydration numbers) of competing cations in the solution. No correlation was found between the heat effects and the degree of exchange. The heat of exchange depends mainly on the difference between the hydration heats of the cations in the solution, whereas the degree of exchange depends on their positioning over the extraframework sites in the clinoptilolite structure. The heats of ion exchange are lower at 95°C than those measured at 30°C, which is due to a decrease of the hydration number with increasing temperature. In all cases the degree of exchange increases with increasing temperature.

Keywords

clinoptilolitebinary cation exchangecalorimetrydegree of exchange
Type
Research Article
Information
Clay Minerals , Volume 46 , Issue 2 , June 2011 , pp. 251 - 259
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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