Home > Research > Publications & Outputs > Ageing and structural effects on the sorption c...
View graph of relations

Ageing and structural effects on the sorption characteristics of Cd2+ by clinoptilolite and Y-type zeolite studied using isotope exchange technique.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published

Standard

Ageing and structural effects on the sorption characteristics of Cd2+ by clinoptilolite and Y-type zeolite studied using isotope exchange technique. / Ahmed, I. A. M.; Young, S. D.; Crout, N. M. J.

In: Journal of Hazardous Materials, Vol. 184, No. 1-3, 15.12.2010, p. 574-584.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

APA

Vancouver

Author

Ahmed, I. A. M. ; Young, S. D. ; Crout, N. M. J. / Ageing and structural effects on the sorption characteristics of Cd2+ by clinoptilolite and Y-type zeolite studied using isotope exchange technique. In: Journal of Hazardous Materials. 2010 ; Vol. 184, No. 1-3. pp. 574-584.

Bibtex

@article{7f6fc8997a71477a8ab84dcc83572162,
title = "Ageing and structural effects on the sorption characteristics of Cd2+ by clinoptilolite and Y-type zeolite studied using isotope exchange technique.",
abstract = "This research investigates the long-term kinetics of Cd2+ sorption and desorption by calcium-exchanged clinoptilolite (CaCpt) and Y-type (CaY) zeolite using isotopic exchange with 109Cd while maintaining pH at circumneutral values. The effects of Si/Al ratio and crystal structure of these zeolitic materials on intracrystalline transport of Cd are discussed. A first-order kinetic model was developed to describe the progressive transfer of Cd2+ to a less reactive form within the zeolite structure, following initial sorption and subsequent desorption of Cd subject to different initial contact times. The kinetic model differentiates between two forms of sorbed Cd2+ designated {\textquoteleft}labile{\textquoteright} and {\textquoteleft}non-labile{\textquoteright} in which the labile form is in immediate equilibrium with the free Cd2+ ion activity in solution. A model combining diffusion and first-order kinetics for cation exchange was also employed to determine Cd2+ diffusivity and intracrystalline exchange rates in CaY and CaCpt. The efficiency of Permeable Reactive Barriers (PRBs) containing zeolitic materials in protecting water systems against lateral flow of metal-contaminated leachate was simulated for three contrasting zeolites. The slow transfer of Cd between labile and non-labile forms was particularly important in moderating high concentration pulses of Cd traversing the PRB. In addition, the reversibility of Cd fixation effectively restored the sorption capability of the zeolite through slow leakage to drainage water.",
keywords = "Cadmium, First-order kinetics, Fixation, Diffusion, Isotopic exchange, Permeable Reactive Barriers",
author = "Ahmed, {I. A. M.} and Young, {S. D.} and Crout, {N. M. J.}",
year = "2010",
month = dec,
day = "15",
doi = "10.1016/j.jhazmat.2010.08.074",
language = "English",
volume = "184",
pages = "574--584",
journal = "Journal of Hazardous Materials",
issn = "0304-3894",
publisher = "Elsevier",
number = "1-3",

}

RIS

TY - JOUR

T1 - Ageing and structural effects on the sorption characteristics of Cd2+ by clinoptilolite and Y-type zeolite studied using isotope exchange technique.

AU - Ahmed, I. A. M.

AU - Young, S. D.

AU - Crout, N. M. J.

PY - 2010/12/15

Y1 - 2010/12/15

N2 - This research investigates the long-term kinetics of Cd2+ sorption and desorption by calcium-exchanged clinoptilolite (CaCpt) and Y-type (CaY) zeolite using isotopic exchange with 109Cd while maintaining pH at circumneutral values. The effects of Si/Al ratio and crystal structure of these zeolitic materials on intracrystalline transport of Cd are discussed. A first-order kinetic model was developed to describe the progressive transfer of Cd2+ to a less reactive form within the zeolite structure, following initial sorption and subsequent desorption of Cd subject to different initial contact times. The kinetic model differentiates between two forms of sorbed Cd2+ designated ‘labile’ and ‘non-labile’ in which the labile form is in immediate equilibrium with the free Cd2+ ion activity in solution. A model combining diffusion and first-order kinetics for cation exchange was also employed to determine Cd2+ diffusivity and intracrystalline exchange rates in CaY and CaCpt. The efficiency of Permeable Reactive Barriers (PRBs) containing zeolitic materials in protecting water systems against lateral flow of metal-contaminated leachate was simulated for three contrasting zeolites. The slow transfer of Cd between labile and non-labile forms was particularly important in moderating high concentration pulses of Cd traversing the PRB. In addition, the reversibility of Cd fixation effectively restored the sorption capability of the zeolite through slow leakage to drainage water.

AB - This research investigates the long-term kinetics of Cd2+ sorption and desorption by calcium-exchanged clinoptilolite (CaCpt) and Y-type (CaY) zeolite using isotopic exchange with 109Cd while maintaining pH at circumneutral values. The effects of Si/Al ratio and crystal structure of these zeolitic materials on intracrystalline transport of Cd are discussed. A first-order kinetic model was developed to describe the progressive transfer of Cd2+ to a less reactive form within the zeolite structure, following initial sorption and subsequent desorption of Cd subject to different initial contact times. The kinetic model differentiates between two forms of sorbed Cd2+ designated ‘labile’ and ‘non-labile’ in which the labile form is in immediate equilibrium with the free Cd2+ ion activity in solution. A model combining diffusion and first-order kinetics for cation exchange was also employed to determine Cd2+ diffusivity and intracrystalline exchange rates in CaY and CaCpt. The efficiency of Permeable Reactive Barriers (PRBs) containing zeolitic materials in protecting water systems against lateral flow of metal-contaminated leachate was simulated for three contrasting zeolites. The slow transfer of Cd between labile and non-labile forms was particularly important in moderating high concentration pulses of Cd traversing the PRB. In addition, the reversibility of Cd fixation effectively restored the sorption capability of the zeolite through slow leakage to drainage water.

KW - Cadmium

KW - First-order kinetics

KW - Fixation

KW - Diffusion

KW - Isotopic exchange

KW - Permeable Reactive Barriers

U2 - 10.1016/j.jhazmat.2010.08.074

DO - 10.1016/j.jhazmat.2010.08.074

M3 - Journal article

VL - 184

SP - 574

EP - 584

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

SN - 0304-3894

IS - 1-3

ER -