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Outer-sphere Pb(II) adsorbed at specific surface sites on single crystal α-alumina

Geochimica et Cosmochimica Acta

By:
, , , and
DOI: 10.1016/0016-7037(96)00222-0

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Abstract

Solvated Pb(II) ions were found to adsorb as structurally well-defined outer-sphere complexes at specific sites on the α-Al2O3 (0001) single crystal surface, as determined by grazing-incidence X-ray absorption fine structure (GI-XAFS) measurements. The XAFS results suggest that the distance between Pb(II) adions and the alumina surface is approximately 4.2 Å. In contrast, Pb(II) adsorbs as more strongly bound inner-sphere complexes on α-Al2O3 (102). The difference in reactivities of the two alumina surfaces has implications for modeling surface complexation reactions of contaminants in natural environments, catalysis, and compositional sector zoning of oxide crystals.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Outer-sphere Pb(II) adsorbed at specific surface sites on single crystal α-alumina
Series title:
Geochimica et Cosmochimica Acta
DOI:
10.1016/0016-7037(96)00222-0
Volume
60
Issue:
18
Year Published:
1996
Language:
English
Publisher:
Elsevier
Description:
7 p.
First page:
3541
Last page:
3547
Online Only (Y/N):
N
Additional Online Files(Y/N):
N