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Rb+ adsorption at the quartz(101)-aqueous interface: comparison of resonant anomalous x-ray reflectivity with ab initio calculations

Journal Article · · Journal of Physical Chemistry. C
DOI:https://doi.org/10.1021/jp510139t· OSTI ID:1265355
 [1];  [1];  [2];  [3];  [4];  [5];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
  2. Pennsylvania State Univ., University Park, PA (United States). Department of Geosciences
  3. St. Petersburg State University, St. Petersburg (Russia). Department of Quantum Chemistry
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
We study adsorption of Rb+ to the quartz(101)–aqueous interface at room temperature with specular X-ray reflectivity, resonant anomalous X-ray reflectivity, and density functional theory. The interfacial water structures observed in deionized water and 10 mM RbCl solution at pH 9.8 were similar, having a first water layer at height of 1.7 ± 0.1 Å above the quartz surface and a second layer at 4.8 ± 0.1 Å and 3.9 ± 0.8 Å for the water and RbCl solutions, respectively. The adsorbed Rb+ distribution is broad and consists of presumed inner-sphere (IS) and outer-sphere (OS) complexes at heights of 1.8 ± 0.1 and 6.4 ± 1.0 Å, respectively. Projector-augmented planewave density functional theory (DFT) calculations of potential configurations for neutral and negatively charged quartz(101) surfaces at pH 7 and 12, respectively, reveal a water structure in agreement with experimental results. These DFT calculations also show differences in adsorbed speciation of Rb+ between these two conditions. At pH 7, the lowest energy structure shows that Rb+ adsorbs dominantly as an IS complex, whereas at pH 12 IS and OS complexes have equivalent energies. The DFT results at pH 12 are generally consistent with the two site Rb distribution observed from the X-ray data at pH 9.8, albeit with some differences that are discussed. In conclusion, surface charge estimated on the basis of the measured total Rb+ coverage was -0.11 C/m2, in good agreement with the range of the surface charge magnitudes reported in the literature.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265355
Alternate ID(s):
OSTI ID: 1392369
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 9 Vol. 119; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (51)

Elements of Modern X-ray Physics book March 2011
Co-adsorption of mono- and multivalent ions on silica and alumina journal August 1994
Multiinstrument Study of the Electrophoretic Mobility of Quartz journal June 2002
The pH-Dependent Surface Charging and the Points of Zero Charge journal September 2002
Prediction of some weathering trends of plutonic and volcanic rocks based on thermodynamic and kinetic considerations journal July 1984
Controls on silicate dissolution rates in neutral and basic pH solutions at 25°C journal November 1989
Dissolution of quartz in aqueous basic solution, 106–236°C: Surface kinetics of “perfect” crystallographic faces journal November 1990
Mechanisms of silica dissolution as inferred from the kinetic isotope effect journal December 1990
Kinetics of quartz dissolution in electrolyte solutions using a hydrothermal mixed flow reactor journal April 1990
Quartz dissolution: Negative crystal experiments and a rate law journal March 1993
Quartz dissolution: Theory of rough and smooth surfaces journal March 1993
Dissolution rate of quartz in lead and sodium electrolyte solutions between 25 and 300°C: Effect of the nature of surface complexes and reaction affinity journal January 1994
Surface structure determination by X-ray diffraction journal May 1989
Standard enthalpies of ion adsorption onto oxides from aqueous solutions and mixed solvents journal March 1994
Structures of quartz (100)- and (101)-water interfaces determined by x-ray reflectivity and atomic force microscopy of natural growth surfaces journal September 2002
Quartz solubility at low temperatures journal July 1997
The influence of the alkaline earth cations, magnesium, calcium, and barium on the dissolution kinetics of quartz journal August 1997
Chemical weathering in a tropical watershed, Luquillo Mountains, Puerto Rico III: quartz dissolution rates journal February 1999
The dissolution kinetics of quartz in aqueous mixed cation solutions journal November 1999
Ion–ion correlations in charged colloidal suspensions journal February 2002
Compilation of PZC and IEP of sparingly soluble metal oxides and hydroxides from literature journal November 2009
Surface charge density on silica in alkali and alkaline earth chloride electrolyte solutions journal November 2005
Structure of hydrated Zn2+ at the rutile TiO2 (110)-aqueous solution interface: Comparison of X-ray standing wave, X-ray absorption spectroscopy, and density functional theory results journal August 2006
Adsorption of Rb+ and Sr2+ at the orthoclase (001)–solution interface journal April 2008
Competitive adsorption of strontium and fulvic acid at the muscovite–solution interface observed with resonant anomalous X-ray reflectivity journal March 2010
Diagenetic changes in macro- to nano-scale porosity in the St. Peter Sandstone: An (ultra) small angle neutron scattering and backscattered electron imaging analysis journal February 2013
The pH-dependent surface charging and points of zero charge journal January 2011
Structure of rutile TiO2 (110) in water and 1molal Rb+ at pH 12: Inter-relationship among surface charge, interfacial hydration structure, and substrate structural displacements journal February 2007
Determination of the Charge Density of Silica Sols journal September 1957
Reaction Rates and Dissolution Mechanisms of Quartz as a Function of pH journal March 2008
Simulations of the Quartz(101̅1)/Water Interface: A Comparison of Classical Force Fields, Ab Initio Molecular Dynamics, and X-ray Reflectivity Experiments journal December 2010
Periodic Density Functional Theory Study of Water Adsorption on the α-Quartz (101) Surface journal March 2011
A New Hypothesis for the Dissolution Mechanism of Silicates journal August 2012
Modeling Water Adsorption on Rutile (110) Using van der Waals Density Functional and DFT+U Methods journal October 2013
Termination and Water Adsorption at the α-Al 2 O 3 (012)−Aqueous Solution Interface journal May 2006
Hydrated Cation Speciation at the Muscovite (001)−Water Interface journal November 2010
Rb + and Sr 2+ Adsorption at the TiO 2 (110)−Electrolyte Interface Observed with Resonant Anomalous X-ray Reflectivity journal September 2009
Wormhole formation in dissolving fractures journal January 2009
Chemical kinetics of water-rock interactions journal June 1984
Looking into overcharging in model colloids through electrophoresis: Asymmetric electrolytes journal March 2003
A simple analysis of ion–ion correlation in polyelectrolyte solutions journal February 1990
Mechanisms of classical crystal growth theory explain quartz and silicate dissolution behavior journal October 2005
Kinetics of amorphous silica dissolution and the paradox of the silica polymorphs journal July 2008
Crystal truncation rods and surface roughness journal March 1986
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
Generalized Gradient Approximation Made Simple journal October 1996
Phasing of resonant anomalous X-ray reflectivity spectra and direct Fourier synthesis of element-specific partial structures at buried interfaces journal March 2007
Studies of the Dissociation of Oxide Surfaces at the Liquid–Solid Interface journal July 1966
The Mineral-Water Interface: Where Minerals React with the Environment journal June 2013
A model of surface site types on oxide and silicate minerals based on crystal chemistry; implications for site types and densities, multi-site adsorption, surface infrared spectroscopy, and dissolution kinetics journal May 1998
Mineral-Aqueous Solution Interfaces and Their Impact on the Environment journal October 2012

Cited By (2)

Modeling of solid–liquid interfaces using scaled charges: rutile (110) surfaces journal January 2018
DFT-MD of the (110)-Co 3 O 4 cobalt oxide semiconductor in contact with liquid water, preliminary chemical and physical insights into the electrochemical environment journal January 2019

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