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Title: Inorganic ligand effects on Pb(II) sorption to goethite ({alpha}-FeOOH). 2. Sulfate

Abstract

The effects of sulfate anions on the uptake of Pb(II) onto goethite were investigated at the molecular level using in situ PbL{sub 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 pH7 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){sub 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 C{sub 3v} 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 et al. these results indicate formation of Type A ternary complexes bonded to the surface through Pb that is bound as a bridging bidentate complex to two adjacent A-type (singly coordinated) surface oxygens.

Authors:
; ; ;
Publication Date:
Research Org.:
Stanford Univ., CA (US)
Sponsoring Org.:
USDOE
OSTI Identifier:
20080259
DOE Contract Number:  
FG03-93ER14347
Resource Type:
Journal Article
Journal Name:
Journal of Colloid and Interface Science
Additional Journal Information:
Journal Volume: 225; Journal Issue: 2; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0021-9797
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; LIGANDS; LEAD; GOETHITE; SULFATES; SORPTION; MOLECULAR STRUCTURE; SORPTIVE PROPERTIES; ENVIRONMENTAL TRANSPORT

Citation Formats

Ostergren, J.D., Brown, G.E. Jr., Parks, G.A., and Persson, P. Inorganic ligand effects on Pb(II) sorption to goethite ({alpha}-FeOOH). 2. Sulfate. United States: N. p., 2000. Web. doi:10.1006/jcis.1999.6702.
Ostergren, J.D., Brown, G.E. Jr., Parks, G.A., & Persson, P. Inorganic ligand effects on Pb(II) sorption to goethite ({alpha}-FeOOH). 2. Sulfate. United States. doi:10.1006/jcis.1999.6702.
Ostergren, J.D., Brown, G.E. Jr., Parks, G.A., and Persson, P. Mon . "Inorganic ligand effects on Pb(II) sorption to goethite ({alpha}-FeOOH). 2. Sulfate". United States. doi:10.1006/jcis.1999.6702.
@article{osti_20080259,
title = {Inorganic ligand effects on Pb(II) sorption to goethite ({alpha}-FeOOH). 2. Sulfate},
author = {Ostergren, J.D. and Brown, G.E. Jr. and Parks, G.A. and Persson, P.},
abstractNote = {The effects of sulfate anions on the uptake of Pb(II) onto goethite were investigated at the molecular level using in situ PbL{sub 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 pH7 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){sub 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 C{sub 3v} 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 et al. these results indicate formation of Type A ternary complexes bonded to the surface through Pb that is bound as a bridging bidentate complex to two adjacent A-type (singly coordinated) surface oxygens.},
doi = {10.1006/jcis.1999.6702},
journal = {Journal of Colloid and Interface Science},
issn = {0021-9797},
number = 2,
volume = 225,
place = {United States},
year = {2000},
month = {5}
}