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Electrolyte layering at the calcite(104)-water interface indicated by Rb⁺- and Se(VI) K-edge resonant interface diffraction

Heberling, F.; Eng, P.; Denecke, M. A.; Lützenkirchen, J.; Geckeis, H.

Abstract:
Calcite-water interface reactions are of major importance in various environmental settings as well as in industrial applications. Here we present resonant interface diffraction results on the calcite(104)-aqueous solution interface{,} measured in solutions containing either 10 mmol L-1 RbCl or 0.5 mmol L-1 Se(vi). Results indicate that Rb+ ions enter the surface adsorbed water layers and adsorb at the calcite(104)-water interface in an inner-sphere fashion. A detailed analysis based on specular and off-specular resonant interface diffraction data reveals three distinct Rb+ adsorption species: one 1.2 A above the surface{,} the second associated with surface adsorbed water molecules 3.2 A above the surface{,} and the third adsorbed in an outer-sphere fashion 5.6 A above the surface. A peak in resonant amplitude between L = 1.5 and L = 3.0 is interpreted as signal from a layered electrolyte structure. The presence of a layered electrolyte structure seems to be confirmed by data measured in the presence of Se(vi).

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Volltext §
DOI: 10.5445/IR/1000046547
Originalveröffentlichung
DOI: 10.1039/C4CP00672K
Scopus
Zitationen: 5
Web of Science
Zitationen: 5
Seitenaufrufe: 26
seit 12.05.2018
Downloads: 61
seit 21.03.2015
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 1463-9076
urn:nbn:de:swb:90-465471
KITopen-ID: 1000046547
HGF-Programm 32.27.01 (POF II, LK 01)
Erschienen in Physical Chemistry Chemical Physics
Band 16
Heft 25
Seiten 12782-12792
Bemerkung zur Veröffentlichung RSC geförderter Open Access-Artikel
Nachgewiesen in Web of Science
Scopus
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