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DOI: 10.1039/A604919B (Paper) Reference Section for: J. Chem. Soc., Faraday Trans., 1997, 93, 499-503

Measurement and prediction of Ca–Na ion-exchange equilibrium in maximum aluminium P (MAP), a zeolite with the GIS framework topology

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Christopher J. Adams, Abraham Araya, Karen J. Cunningham, Kevin R. Franklin and Ian F. White

Abstract

Ion-exchange equilibrium studies have been carried out on the system Ca–Na-zeolite MAP (maximum aluminium P), and comparison made with those reported previously for Ca–Na-zeolite A. Over much of the exchange system, zeolite MAP shows greater selectivity for calcium than does zeolite A. The high selectivity for calcium shown by MAP and the unusual Z-shaped selectivity plot are attributed to the formation of coexisting sodium- and calcium-rich zeolite phases. The selectivity coefficient KG at any given calcium loading is invariant with solution total normality over at least the range 0.025 to 0.4 equiv. dm-3, and prediction procedures dependent on this requirement have been tested successfully.

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