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Title: 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

Abstract

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.

Authors:
; ; ;
Publication Date:
Research Org.:
Stanford Univ. CA (US)
Sponsoring Org.:
USDOE; National Institutes of Health (NIH)
OSTI Identifier:
20000021
DOE Contract Number:  
FG03-93ER14347
Resource Type:
Journal Article
Journal Name:
Journal of Colloid and Interface Science
Additional Journal Information:
Journal Volume: 217; Journal Issue: 2; Other Information: PBD: 15 Sep 1999; Journal ID: ISSN 0021-9797
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 54 ENVIRONMENTAL SCIENCES; COBALT; ALUMINIUM OXIDES; ADSORPTION; INTERFACES; CATALYSTS; INTEGRATED CIRCUITS; GEOCHEMISTRY; ENVIRONMENTAL TRANSPORT

Citation Formats

Towle, S.N., Bargar, J.R., Brown, G.E. Jr., and Parks, G.A. 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. United States: N. p., 1999. Web. doi:10.1006/jcis.1999.6351.
Towle, S.N., Bargar, J.R., Brown, G.E. Jr., & Parks, G.A. 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. United States. doi:10.1006/jcis.1999.6351.
Towle, S.N., Bargar, J.R., Brown, G.E. Jr., and Parks, G.A. Wed . "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". United States. doi:10.1006/jcis.1999.6351.
@article{osti_20000021,
title = {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},
author = {Towle, S.N. and Bargar, J.R. and Brown, G.E. Jr. and Parks, G.A.},
abstractNote = {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.},
doi = {10.1006/jcis.1999.6351},
journal = {Journal of Colloid and Interface Science},
issn = {0021-9797},
number = 2,
volume = 217,
place = {United States},
year = {1999},
month = {9}
}