THERMODYNAMICS OF ALKALI AND ALKALINE EARTH METAL ION-EXCHANGE ON ZIRCONIUM SULPHOPHOSPHONATES
- 1 February 1990
- journal article
- research article
- Published by Taylor & Francis in Solvent Extraction and Ion Exchange
- Vol. 8 (1) , 187-197
- https://doi.org/10.1080/07366299008917993
Abstract
The thermodynamics of alkali and alkaline earth metal ion exchange on a layered zirconium sulphophosphonate having the general composition Zr(O3PC6H4SO3H) ×(HPO4) 2−× yH2O have been investigated. Enthalpy and entropy changes accompanying the M2+ - H+ exchange (M = Na+, Cs+, Mg2+ and Ba2+)were determined by the temperature variation method. For the monovalent ions, Na+ and Cs+, the enthalpy terms favor exchange whereas the entropy terms are unfavorable. In contrast, for the divalent ions, Mg2+ and Ba2+, the exchange is due to highly favorable entropy terms.Keywords
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