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:
- USDOE; National Institutes of Health (NIH)
- DOE Contract Number:
- FG03-93ER14347
- OSTI ID:
- 20000021
- Journal Information:
- Journal of Colloid and Interface Science, Vol. 217, Issue 2; Other Information: PBD: 15 Sep 1999; ISSN 0021-9797
- Country of Publication:
- United States
- Language:
- English
Similar Records
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
In-situ Grazing-Incidence EXAFS Study of Pb(II) Chemisorption on Hematite (0001) and (1-102) Surfaces (titled changed by journal: IN SITU GRAZING INCIDENCE EXTENDED X-RAY ABSORPTION FINE STRUCTURE STUDY OF PB(II) CHEMISORPTION ON HEMATITE (0001) AND (1-102) SURFACES)