Sorption of Co(II) on metal oxide surfaces. 2. identification of Co(II)(aq) adsorption sites on the (0001) and (1{bar 1}02) surfaces of {alpha}-Al{sub 2}O{sub 3} by grazing-incidence XAFS spectroscopy
The authors have characterized the adsorption of Co(II) on the (0001) and (1{bar 1}02) surfaces of {alpha}-Al{sub 2}O{sub 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 (1{bar 1}02) surface. Based on EXAFS results and bond valence analysis, plausible surface complexation reactions for Co(II) sorption on these two surfaces are presented.
- Research Organization:
- Stanford Univ. CA (US)
- Sponsoring Organization:
- US Department of Energy; National Institutes of Health
- DOE Contract Number:
- FG03-93ER14347
- OSTI ID:
- 20000021
- Journal Information:
- Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: 2 Vol. 217; ISSN 0021-9797; ISSN JCISA5
- Country of Publication:
- United States
- Language:
- English
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