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Effect of Surface Structure on The Adsorption of CO(II) on ∝-Al2O3: A Glancing Angle Xafs Study

Published online by Cambridge University Press:  15 February 2011

Steven N. Towle ,
John R. Bargar ,
Gordon E. Brown Jr. ,
George A. Parks  and
Troy W. Barbee Jr.
Steven N. Towle
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305 Department of Geological and Environmental Science, Stanford University, Stanford, CA 94305-2115
John R. Bargar
Affiliation:
Department of Geological and Environmental Science, Stanford University, Stanford, CA 94305-2115
Gordon E. Brown Jr.
Affiliation:
Department of Geological and Environmental Science, Stanford University, Stanford, CA 94305-2115
George A. Parks
Affiliation:
Department of Geological and Environmental Science, Stanford University, Stanford, CA 94305-2115
Troy W. Barbee Jr.
Affiliation:
Lawrence Livermore National Laboratory, Livermore CA
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Abstract

Glancing-angle x-ray absorption fine structure (XAFS) spectroscopy has been used to characterize the structure of Co(II) complexes adsorbed from aqueous solution on single crystal ∝-Al2O3 surfaces. The spectra reveal considerable differences in the local structure, as a function of both the crystallographic face and the orientation of the sample with respect to the beam polarization. Data analysis indicates that the predominant mode of Co chemisorption is as a tridentate CoO6 octahedral complex edge-shared with surface Al octahedra. For systems where this method is feasible, it is the technique of choice for characterizing metal ion adsorption complexes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 357: Symposium C – Structure and Properties of Interfaces in Ceramics , 1994 , 23
Copyright
Copyright © Materials Research Society 1995

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