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
Journal Article
·
· Journal of Colloid and Interface Science
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
Similar Records
XAFS and bond-valence determination of the structures and compositions of surface functional groups and Pb(II) and Co(II) sorption products on single-crystal {alpha}-Al{sub 2}O{sub 3}
Electronic structure and energetics of sapphire (0001) and (1 1 02) surfaces
Sorption of Co(II) on metal oxide surfaces. 1. Identification of specific binding sites of Co(II) on (110) and (001) surfaces of TiO{sub 2} (rutile) by grazing-incidence XAFS spectroscopy
Journal Article
·
Tue Jan 14 23:00:00 EST 1997
· Journal of Colloid and Interface Science
·
OSTI ID:438897
Electronic structure and energetics of sapphire (0001) and (1 1 02) surfaces
Journal Article
·
Mon Jun 15 00:00:00 EDT 1992
· Physical Review, B: Condensed Matter; (United States)
·
OSTI ID:7110267
Sorption of Co(II) on metal oxide surfaces. 1. Identification of specific binding sites of Co(II) on (110) and (001) surfaces of TiO{sub 2} (rutile) by grazing-incidence XAFS spectroscopy
Journal Article
·
Wed Sep 15 00:00:00 EDT 1999
· Journal of Colloid and Interface Science
·
OSTI ID:20000020