Structures and stabilities of Cd(II) and Cd(II)-phthalate complexes at the goethite/water interface
(2005) In Geochimica et Cosmochimica Acta 69. p.3219-3235- Abstract
- The complexation of Cd(II) and Cd(II)-phthalate at the goethite/water interface were investigated by EXAFS and IR spectroscopy, by batch adsorption experiments and by potentiometric titrations at 298.15 K. The EXAFS spectra showed Cd(IT) to form only inner-sphere corner-sharing complexes with the goethite surface sites in the presence and absence of phthalate. EXAFS spectra also showed the presence of Cd(II)-chloride complexes in 0.1 mol/L NaCl. IR spectra also showed phthalate to form (1) an inner-sphere complex with adsorbed corner-sharing Cd(II) surface complexes in the pH 3.5 to 9.5 and (2) an outer-sphere complex with the same type of corner-sharing Cd(II) complex however at pH > 6, in addition to the inner- and outer-sphere... (More)
- The complexation of Cd(II) and Cd(II)-phthalate at the goethite/water interface were investigated by EXAFS and IR spectroscopy, by batch adsorption experiments and by potentiometric titrations at 298.15 K. The EXAFS spectra showed Cd(IT) to form only inner-sphere corner-sharing complexes with the goethite surface sites in the presence and absence of phthalate. EXAFS spectra also showed the presence of Cd(II)-chloride complexes in 0.1 mol/L NaCl. IR spectra also showed phthalate to form (1) an inner-sphere complex with adsorbed corner-sharing Cd(II) surface complexes in the pH 3.5 to 9.5 and (2) an outer-sphere complex with the same type of corner-sharing Cd(II) complex however at pH > 6, in addition to the inner- and outer-sphere complexes of phthalate reported in a previous study. The potentiometric fitration and the batch adsorption data were used to constrain the formation constants of the different Cd(II)-phthalate surface complexes on the dominant {110} and the {001} planes of the goethite. The models were carried out with the Charge Distribution Multisite Complexation model coupled to the Three Plane Model and can predict the molecular-scale speciation of cadmium and phthalate in the presence of goethite. Cd(II) adsorption models calibrated on a 90 m(2)/g goethite also could accurately predict experimental data for a 37 m(2)/g goethite of slightly different basic charging properties. Copyright (C) 2005 Elsevier Ltd. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4332527
- author
- Boily, J. F. ; Sjoberg, S. and Persson, Per LU
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Geochimica et Cosmochimica Acta
- volume
- 69
- pages
- 3219 - 3235
- publisher
- Elsevier
- external identifiers
-
- scopus:21644474912
- ISSN
- 0016-7037
- DOI
- 10.1016/j.gca.2004.12.013
- language
- English
- LU publication?
- no
- additional info
- 13
- id
- 76dc1ec3-c01b-4dfc-a5c9-4e82c4b0a5aa (old id 4332527)
- date added to LUP
- 2016-04-01 12:29:25
- date last changed
- 2022-03-21 05:05:41
@article{76dc1ec3-c01b-4dfc-a5c9-4e82c4b0a5aa,
abstract = {{The complexation of Cd(II) and Cd(II)-phthalate at the goethite/water interface were investigated by EXAFS and IR spectroscopy, by batch adsorption experiments and by potentiometric titrations at 298.15 K. The EXAFS spectra showed Cd(IT) to form only inner-sphere corner-sharing complexes with the goethite surface sites in the presence and absence of phthalate. EXAFS spectra also showed the presence of Cd(II)-chloride complexes in 0.1 mol/L NaCl. IR spectra also showed phthalate to form (1) an inner-sphere complex with adsorbed corner-sharing Cd(II) surface complexes in the pH 3.5 to 9.5 and (2) an outer-sphere complex with the same type of corner-sharing Cd(II) complex however at pH > 6, in addition to the inner- and outer-sphere complexes of phthalate reported in a previous study. The potentiometric fitration and the batch adsorption data were used to constrain the formation constants of the different Cd(II)-phthalate surface complexes on the dominant {110} and the {001} planes of the goethite. The models were carried out with the Charge Distribution Multisite Complexation model coupled to the Three Plane Model and can predict the molecular-scale speciation of cadmium and phthalate in the presence of goethite. Cd(II) adsorption models calibrated on a 90 m(2)/g goethite also could accurately predict experimental data for a 37 m(2)/g goethite of slightly different basic charging properties. Copyright (C) 2005 Elsevier Ltd.}},
author = {{Boily, J. F. and Sjoberg, S. and Persson, Per}},
issn = {{0016-7037}},
language = {{eng}},
pages = {{3219--3235}},
publisher = {{Elsevier}},
series = {{Geochimica et Cosmochimica Acta}},
title = {{Structures and stabilities of Cd(II) and Cd(II)-phthalate complexes at the goethite/water interface}},
url = {{http://dx.doi.org/10.1016/j.gca.2004.12.013}},
doi = {{10.1016/j.gca.2004.12.013}},
volume = {{69}},
year = {{2005}},
}