Ahmed, Imad A. M. and Young, Scott D. and Crout, Neil M. J. (2006) Time-dependent sorption of Cd2+ on CaX zeolite : experimental observations and model predictions. Geochimica and Cosmochimica Acta, 70 (19). pp. 4850-4861. 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 |
| Uncontrolled Keywords: | Zeolite ; model prediction ; Speciation ; Free ion activity ; chabazite ; intra-particle diffusion ; kinetic model ; diffusion model |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences |
| Departments: | Faculty of Science and Technology > Lancaster Environment Centre |
| ID Code: | 33833 |
| Deposited By: | Dr Imad Ahmed |
| Deposited On: | 20 Jul 2010 13:20 |
| Refereed?: | Yes |
| Published?: | Published |
| Last Modified: | 26 Jul 2012 17:28 |
| Identification Number: | |
| URI: | http://eprints.lancs.ac.uk/id/eprint/33833 |
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