Cation exchange at the mineral-water interface: H3O+/K+ competition at the surface of nano-muscovite

Langmuir : the ACS Journal of Surfaces and Colloids
Geoffrey M BowersR James Kirkpatrick

Abstract

This article describes a (39)K nuclear magnetic resonance (NMR) spectroscopic study of K+ displacement at the muscovite/water interface as a function of aqueous phase pH. (39)K NMR spectra and T 2 relaxation data for nanocrystalline muscovite wet with a solid/solution weight ratio of 1 at pH 1, 3, and 5.5 show substantial liquid-like K+ only at pH 1. At pH 3 and 5.5, all K+ appears to be associated with muscovite as inner- or outer-sphere complexes, indicating that H(3)O+ does not displace basal surface K+ beyond the (39)K detection limit under these conditions. In our pH 1 mixture, only approximately 1/3 of the initial basal surface K+ population is located more than 3-4 A from the surface. (29)Si and (27)Al MAS NMR spectra and SEM images show no evidence of dissolution during the (39)K experiments, consistent with the liquid-like (39)K fraction originating from displaced basal surface K+. Assuming no muscovite dissolution or interlayer exchange, the K+/H(3)O+ ratio relevant to the solution/surface exchange equilibrium is controlled by the total amount of K+ on the surface and H(3)O+ in solution (K+(surf)/H(3)O+(aq)). These parameters, in turn, depend on the basal surface area, solution pH, and the solid/solution ratio. The re...Continue Reading

References

May 26, 1999·Journal of Colloid and Interface Science·M A Osman, U W Suter
Oct 3, 2001·Physical Review Letters·L ChengN C Sturchio
Apr 13, 2002·Solid State Nuclear Magnetic Resonance·J StebbinsH J Jakobsen
Aug 23, 2002·Physical Review Letters·Sung-Ho Park, Garrison Sposito
Jul 21, 2006·The Journal of Physical Chemistry. B·Jianwei WangRandall T Cygan
Aug 16, 2006·Physical Review Letters·Changyong ParkNeil C Sturchio
Jun 15, 2007·Colloids and Surfaces. B, Biointerfaces·Klemen KunsteljIrena Drevensek-Olenik

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Citations

May 17, 2014·The Journal of Chemical Physics·Alexander Pertsin, Michael Grunze
Sep 4, 2019·Nature Nanotechnology·L MoggM Lozada-Hidalgo
Dec 5, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Changyong ParkKathryn L Nagy

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