Tungstate sorption mechanisms on boehmite: Systematic uptake studies and X-ray absorption spectroscopy analysis

Tungstate sorption mechanisms on boehmite: Systematic uptake studies and X-ray absorption... Journal of Colloid and Interface Science 461 (2016) 249–260 Contents lists available at ScienceDirect Journal of Colloid and Interface Science journal homepage: www.elsevier.com/locate/jcis Tungstate sorption mechanisms on boehmite: Systematic uptake studies and X-ray absorption spectroscopy analysis a,1 b,⇑ Hyuck Hur , Richard J. Reeder Department of Chemistry, Stony Brook University, Stony Brook, NY 11794, USA Department of Geosciences, Stony Brook University, Stony Brook, NY 11794, USA graphical a bstract article i nfo abstract Article history: Mechanisms of tungstate sorption on the mineral boehmite (c-AlOOH) were studied using batch uptake Received 20 March 2015 experiments and X-ray absorption spectroscopy. Batch uptake experiments over the pH range 4–8 and Revised 1 September 2015 [W] = 50–2000 lM show typical oxyanion behavior, and isotherm experiments reveal continued uptake Accepted 2 September 2015 with increasing tungstate concentration without any clear uptake maximum. Desorption experiments Available online 5 September 2015 showed that sorption is irreversible at pH 4 and partly reversible at pH 8. Tungsten L - and L -edge 1 3 XANES spectroscopy indicates that all sorbed tungstates are octahedrally coordinated, even though the Keywords: dominant solution species at pH 8 is a tetrahedral monotungstate. Tungsten L -edge EXAFS analysis Tungstate shows that http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Colloid and Interface Science Elsevier

Tungstate sorption mechanisms on boehmite: Systematic uptake studies and X-ray absorption spectroscopy analysis

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier Inc.
ISSN
0021-9797
eISSN
1095-7103
D.O.I.
10.1016/j.jcis.2015.09.011
Publisher site
See Article on Publisher Site

Abstract

Journal of Colloid and Interface Science 461 (2016) 249–260 Contents lists available at ScienceDirect Journal of Colloid and Interface Science journal homepage: www.elsevier.com/locate/jcis Tungstate sorption mechanisms on boehmite: Systematic uptake studies and X-ray absorption spectroscopy analysis a,1 b,⇑ Hyuck Hur , Richard J. Reeder Department of Chemistry, Stony Brook University, Stony Brook, NY 11794, USA Department of Geosciences, Stony Brook University, Stony Brook, NY 11794, USA graphical a bstract article i nfo abstract Article history: Mechanisms of tungstate sorption on the mineral boehmite (c-AlOOH) were studied using batch uptake Received 20 March 2015 experiments and X-ray absorption spectroscopy. Batch uptake experiments over the pH range 4–8 and Revised 1 September 2015 [W] = 50–2000 lM show typical oxyanion behavior, and isotherm experiments reveal continued uptake Accepted 2 September 2015 with increasing tungstate concentration without any clear uptake maximum. Desorption experiments Available online 5 September 2015 showed that sorption is irreversible at pH 4 and partly reversible at pH 8. Tungsten L - and L -edge 1 3 XANES spectroscopy indicates that all sorbed tungstates are octahedrally coordinated, even though the Keywords: dominant solution species at pH 8 is a tetrahedral monotungstate. Tungsten L -edge EXAFS analysis Tungstate shows that

Journal

Journal of Colloid and Interface ScienceElsevier

Published: Jan 1, 2016

References

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