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Inorganic ligand effects on Pb(II) sorption to goethite (alpha-FeOOH) - II. Sulfate

Ostergren, J. D.; Brown, G. E.; Parks, G. A. and Persson, Per LU (2000) In Journal of Colloid and Interface Science 225. p.483-493
Abstract
The effects of sulfate anions on the uptake of Pb(II) onto goethite were investigated at the molecular level using in situ Pb L-III-EXAFS and ATR-FTIR spectroscopies. Macroscopic uptake data show that Pb uptake can be enhanced by at least 30% at pH 5 in the presence of 3.16 mM sulfate and that sulfate uptake at pH 7 can be enhanced by more than a factor of 3 in the presence of 1.0 mM Pb. Consistent with behavior in sulfate-free systems, Pb(II) forms inner-sphere complexes sharing either corners or edges with Fe(O,OH)(6) octahedra under all conditions studied. The relative fraction of corner-sharing complexes is, however, significantly enhanced in the presence of sulfate at pH 5, 6, and 7 (all conditions studied) and additional sulfate... (More)
The effects of sulfate anions on the uptake of Pb(II) onto goethite were investigated at the molecular level using in situ Pb L-III-EXAFS and ATR-FTIR spectroscopies. Macroscopic uptake data show that Pb uptake can be enhanced by at least 30% at pH 5 in the presence of 3.16 mM sulfate and that sulfate uptake at pH 7 can be enhanced by more than a factor of 3 in the presence of 1.0 mM Pb. Consistent with behavior in sulfate-free systems, Pb(II) forms inner-sphere complexes sharing either corners or edges with Fe(O,OH)(6) octahedra under all conditions studied. The relative fraction of corner-sharing complexes is, however, significantly enhanced in the presence of sulfate at pH 5, 6, and 7 (all conditions studied) and additional sulfate species with Ca or lower point symmetry were noted in the presence of Pb by ATR-FTIR. Drawing on bond valence and structural constraints developed in J. D. Ostergren ef al. (2000, J. Colloid Interface Science 224, 000-000), these results indicate formation of Type A ternary complexes bonded to the surface through Pb that is bound as a bridging bidenate complex to two adjacent A-type (singly coordinated) surface oxygens (=Fe-O)(2)-Pb-OSO3). (C) 2000 Academic Press. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Colloid and Interface Science
volume
225
pages
483 - 493
publisher
Elsevier
external identifiers
  • scopus:0034657150
ISSN
1095-7103
DOI
10.1006/jcis.1999.6702
language
English
LU publication?
no
id
953a0833-c620-4ecb-bf11-65ff76094ff5 (old id 4332601)
date added to LUP
2014-03-04 09:43:15
date last changed
2017-02-26 03:28:45
@article{953a0833-c620-4ecb-bf11-65ff76094ff5,
  abstract     = {The effects of sulfate anions on the uptake of Pb(II) onto goethite were investigated at the molecular level using in situ Pb L-III-EXAFS and ATR-FTIR spectroscopies. Macroscopic uptake data show that Pb uptake can be enhanced by at least 30% at pH 5 in the presence of 3.16 mM sulfate and that sulfate uptake at pH 7 can be enhanced by more than a factor of 3 in the presence of 1.0 mM Pb. Consistent with behavior in sulfate-free systems, Pb(II) forms inner-sphere complexes sharing either corners or edges with Fe(O,OH)(6) octahedra under all conditions studied. The relative fraction of corner-sharing complexes is, however, significantly enhanced in the presence of sulfate at pH 5, 6, and 7 (all conditions studied) and additional sulfate species with Ca or lower point symmetry were noted in the presence of Pb by ATR-FTIR. Drawing on bond valence and structural constraints developed in J. D. Ostergren ef al. (2000, J. Colloid Interface Science 224, 000-000), these results indicate formation of Type A ternary complexes bonded to the surface through Pb that is bound as a bridging bidenate complex to two adjacent A-type (singly coordinated) surface oxygens (=Fe-O)(2)-Pb-OSO3). (C) 2000 Academic Press.},
  author       = {Ostergren, J. D. and Brown, G. E. and Parks, G. A. and Persson, Per},
  issn         = {1095-7103},
  language     = {eng},
  pages        = {483--493},
  publisher    = {Elsevier},
  series       = {Journal of Colloid and Interface Science},
  title        = {Inorganic ligand effects on Pb(II) sorption to goethite (alpha-FeOOH) - II. Sulfate},
  url          = {http://dx.doi.org/10.1006/jcis.1999.6702},
  volume       = {225},
  year         = {2000},
}