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 and 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: | Article |
|---|---|
| Journal or Publication Title: | Geochimica and 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 Faculty of Arts & Social Sciences > History |
| ID Code: | 33848 |
| Deposited By: | Dr Imad Ahmed |
| Deposited On: | 20 Jul 2010 13:23 |
| Refereed?: | Yes |
| Published?: | Published |
| Last Modified: | 26 Jul 2012 17:29 |
| Identification Number: | |
| URI: | http://eprints.lancs.ac.uk/id/eprint/33848 |
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