Transition metal ion exchange in zeolites. Part 4.—Exchange of hydrated and amminated silver in sodium X and Y zeolites and mordenite
- 1 January 1981
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 77 (3) , 497-509
- https://doi.org/10.1039/f19817700497
Abstract
The ion-exchange properties of hydrated and amminated silver(I) ions in synthetic sodium X and Y zeolites and mordenite (MOR) were examined at 25 °C and at a total solution normality of 0.1 g equiv dm–3. Ion exchange isotherms were constructed for each system and a thermodynamic affinity sequence of X ≫ Y > MOR was found for the Ag(aq)⇌ Na exchange equilibria. In contrast, a selectivity sequence at MOR ≫ Y > X was observed for the Ag(NH3)2⇌ Na equilibria. These sequences are rationalised using simple dielectric theory or, in the cases involving the hydrated silver ion, using a modification of the theory.Keywords
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