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Concentration-dependent adsorption of CsI at the muscovite - electrolyte interface

DOI: 10.1021/acs.langmuir.8b00038 DOI Help

Authors: Sander J. T. Brugman (Radboud University) , Eleanor R. Townsend (Radboud University) , Mireille M. H. Smets (Radboud University) , Paolo Accordini (Radboud University) , Elias Vlieg (Radboud University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Langmuir

State: Published (Approved)
Published: March 2018
Diamond Proposal Number(s): 15042

Abstract: The interfacial structure of muscovite in contact with aqueous CsI solutions was measured using surface X-ray diffraction for several CsI concentrations (2 - 1000 mM). At CsI concentrations up to 200 mM, Cs+ adsorption is likely hindered by H3O+, as both cations compete for the adsorption site above the muscovite hexagonal cavity. Above this concentration, more Cs+ adsorbs than is required to compensate the negatively charged muscovite surface, which means that co-adsorption of an anion takes place. The I− anion does not co-adsorb in an ordered manner. Moreover, the hydration ring and water layers do not change significantly as function of CsI concentration.

Subject Areas: Chemistry, Materials

Instruments: I07-Surface & interface diffraction

Other Facilities: ESRF