Coordination of Cd2+ ions in the internal pore system of Zeolite-X : a combined EXAFS and isotopic exchange study.

Ahmed, Imad A. M. and Young, S. D. and Mosselmans, J. F. W. and Crout, N. M. J. and Bailey, E. H. (2009) Coordination of Cd2+ ions in the internal pore system of Zeolite-X : a combined EXAFS and isotopic exchange study. Geochimica et Cosmochimica Acta, 73 (6). pp. 1577-1587. ISSN 0016-7037

Full text not available from this repository.

Abstract

The effect of prolonged contact time (up to 130 days) on the immobilization of Cd by sorption to calcium exchanged zeolite-X (CaX), under environmentally relevant conditions, was studied using both isotopic exchange and extended X-ray absorption fine structure spectroscopy (EXAFS). Sorption and isotopic exchange measurements revealed time-dependent Cd sorption and indicated the movement of Cd2+ ions into less accessible sites due to ageing. EXAFS suggested progressive fixation of Cd in the double six-ring (D6R) unit of the CaX structure. Proportional allocation of the apparent Cd–Si bond distance to two ‘end-members’, across all contact times, indicated that the bond distance for labile Cd was 3.41 Å and for non-labile (or fixed) Cd was 3.47 Å.

Item Type:
Journal Article
Journal or Publication Title:
Geochimica et Cosmochimica Acta
Additional Information:
NOT IN FILE
Uncontrolled Keywords:
/dk/atira/pure/researchoutput/libraryofcongress/ge
Subjects:
?? IONS SYSTEM EXAFS EXCHANGEENVIRONMENTAL SCIENCEGEOCHEMISTRY AND PETROLOGYGE ENVIRONMENTAL SCIENCES ??
ID Code:
33848
Deposited By:
Deposited On:
20 Jul 2010 12:23
Refereed?:
Yes
Published?:
Published
Last Modified:
20 Sep 2023 00:06