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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

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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: Article
Journal or Publication Title: Geochimica et Cosmochimica Acta
Additional Information: NOT IN FILE
Uncontrolled Keywords: IONS SYSTEM EXAFS exchange
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 33848
Deposited By: Dr Imad Ahmed
Deposited On: 20 Jul 2010 13:23
Refereed?: Yes
Published?: Published
Last Modified: 30 Jul 2014 14:27
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/33848

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