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Sorption of Co(II) on Metal Oxide Surfaces: II. Identification of Co(II)(aq) Adsorption Sites on the (0001) and (1102) Surfaces of α-Al2O3 by Grazing-Incidence XAFS Spectroscopy

✍ Scribed by Steven N Towle; John R Bargar; Gordon E Brown Jr.; George A Parks

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
180 KB
Volume
217
Category
Article
ISSN
0021-9797

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✦ Synopsis

We have characterized the adsorption of Co(II) on the (0001) and (11 02) surfaces of ␣-Al 2 O 3 single crystals under ambient conditions using polarization-dependent grazing-incidence X-ray absorption fine structure spectroscopy, in combination with bond valence modeling. Co(II) ions were found to be adsorbed on both surfaces in an inner-sphere fashion. Adions were found to adsorb dominantly in a tridentate fashion (i.e., bonded to three surface oxygens) on the (0001) surface and dominantly in a tetradentate fashion on the (11 02) surface. Based on EXAFS results and bond valence analysis, plausible surface complexation reactions for Co(II) sorption on these two surfaces can be written as

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