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Time-dependent sorption of Cd2+ on CaX zeolite : experimental observations and model predictions.

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Time-dependent sorption of Cd2+ on CaX zeolite : experimental observations and model predictions. / Ahmed, Imad A. M.; Young, Scott D.; Crout, Neil M. J.

In: Geochimica et Cosmochimica Acta, Vol. 70, No. 19, 01.10.2006, p. 4850-4861.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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Ahmed, IAM, Young, SD & Crout, NMJ 2006, 'Time-dependent sorption of Cd2+ on CaX zeolite : experimental observations and model predictions.', Geochimica et Cosmochimica Acta, vol. 70, no. 19, pp. 4850-4861. https://doi.org/10.1016/j.gca.2008.12.018

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Ahmed, Imad A. M. ; Young, Scott D. ; Crout, Neil M. J. / Time-dependent sorption of Cd2+ on CaX zeolite : experimental observations and model predictions. In: Geochimica et Cosmochimica Acta. 2006 ; Vol. 70, No. 19. pp. 4850-4861.

Bibtex

@article{00f5ce4cbb1843a69569009ba3b796dc,
title = "Time-dependent sorption of Cd2+ on CaX zeolite : experimental observations and model predictions.",
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 {\textquoteleft}end-members{\textquoteright}, across all contact times, indicated that the bond distance for labile Cd was 3.41 {\AA} and for non-labile (or fixed) Cd was 3.47 {\AA}.",
keywords = "Zeolite, model prediction, Speciation, Free ion activity, chabazite, intra-particle diffusion, kinetic model, diffusion model",
author = "Ahmed, {Imad A. M.} and Young, {Scott D.} and Crout, {Neil M. J.}",
year = "2006",
month = oct,
day = "1",
doi = "10.1016/j.gca.2008.12.018",
language = "English",
volume = "70",
pages = "4850--4861",
journal = "Geochimica et Cosmochimica Acta",
issn = "0016-7037",
publisher = "Elsevier Limited",
number = "19",

}

RIS

TY - JOUR

T1 - Time-dependent sorption of Cd2+ on CaX zeolite : experimental observations and model predictions.

AU - Ahmed, Imad A. M.

AU - Young, Scott D.

AU - Crout, Neil M. J.

PY - 2006/10/1

Y1 - 2006/10/1

N2 - 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.

AB - 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.

KW - Zeolite

KW - model prediction

KW - Speciation

KW - Free ion activity

KW - chabazite

KW - intra-particle diffusion

KW - kinetic model

KW - diffusion model

U2 - 10.1016/j.gca.2008.12.018

DO - 10.1016/j.gca.2008.12.018

M3 - Journal article

VL - 70

SP - 4850

EP - 4861

JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

SN - 0016-7037

IS - 19

ER -