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 of Colloid and Interface Science – Elsevier
Published: Jan 1, 2016
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