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Nonclassical Behavior in Competitive Ion Adsorption at a Charged Solid–Water Interface

Journal Article · · Journal of Physical Chemistry Letters
Ion adsorption at solid-water interfaces is commonly described by interactions between specific surface sites and adsorbed ions in classical models. However, energetic contributions from non-site-specific ion-ion interactions have not been explored systematically. Here, we report non-classical behaviors observed during competitive adsorption between Sr2+ and Na+/Rb+ at the negatively-charged muscovite mica (001)-water interface, revealing apparent controls of adsorbed ion speciation over the interfacial reactivity. In the absence of competing cations, Sr2+ adsorbs in approximately equivalent proportions of inner-sphere and outer-sphere complexes, whereas it adsorbs predominantly as an outer-sphere complex in the presence of Na+/Rb+. This transformation of adsorbed Sr2+ speciation significantly decreases its adsorption strength, as indicated by ~15-fold shift in the Sr2+ adsorption edge concentration, compared to that calculated from a classical Langmuir isotherm model developed based on site-specific interactions. Finally, these observations highlight the importance of non-site-specific interactions in controlling the energetics of chemical reactions at the charged interface.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1617653
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 10 Vol. 11; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (40)

Mechanistic Studies of Metal Aqua Ions: A Semi-Historical Perspective journal March 2005
A Surface Structural Approach to Ion Adsorption: The Charge Distribution (CD) Model journal May 1996
Multisite Adsorption of Cadmium on Goethite journal November 1996
Quest for ion–ion correlations in electric double layers and overcharging phenomena journal March 2009
Reactive transport modeling: An essential tool and a new research approach for the Earth sciences journal December 2005
Copper(II) sorption onto goethite, hematite and lepidocrocite: a surface complexation model based on ab initio molecular geometries and EXAFS spectroscopy journal June 2004
Cation sorption on the muscovite (001) surface in chloride solutions using high-resolution X-ray reflectivity journal July 2006
A surface complexation model for sulfate and selenate on iron oxides consistent with spectroscopic and theoretical molecular evidence journal January 2007
Simultaneous inner- and outer-sphere arsenate adsorption on corundum and hematite 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
Adsorption of Sr2+ and Ba2+ at the cleaved mica–water interface: Free energy profiles and interfacial structure journal March 2010
Changes in adsorption free energy and speciation during competitive adsorption between monovalent cations at the muscovite (001)-water interface journal December 2013
Inner- and outer-sphere complexation of ions at the goethite–solution interface journal May 2006
Stern Layer Structure and Energetics at Mica–Water Interfaces journal April 2017
Solid–Liquid Interface Structure of Muscovite Mica in CsCl and RbBr Solutions journal November 2016
Metal Oxide Surfaces and Their Interactions with Aqueous Solutions and Microbial Organisms journal January 1999
Enhanced Uptake and Modified Distribution of Mercury(II) by Fulvic Acid on the Muscovite (001) Surface journal June 2009
Direct Determination of Lead Speciation in Contaminated Soils by EXAFS Spectroscopy journal January 1996
Accurate Rates of the Complex Mechanisms for Growth and Dissolution of Minerals Using a Combination of Rare-Event Theories journal July 2011
Investigation of Structure, Adsorption Free Energy, and Overcharging Behavior of Trivalent Yttrium Adsorbed at the Muscovite (001)–Water Interface journal October 2013
Monovalent Ion Adsorption at the Muscovite (001)–Solution Interface: Relationships among Ion Coverage and Speciation, Interfacial Water Structure, and Substrate Relaxation journal May 2012
Thermodynamics, Interfacial Structure, and pH Hysteresis of Rb + and Sr 2+ Adsorption at the Muscovite (001)−Solution Interface journal December 2008
Physical surface-complexation models for sorption at the mineral–water interface journal August 1993
Atomically resolved three-dimensional structures of electrolyte aqueous solutions near a solid surface journal July 2016
Real-time observation of cation exchange kinetics and dynamics at the muscovite-water interface journal June 2017
Water-induced correlation between single ions imaged at the solid–liquid interface journal July 2014
Role of hydration energy and co-ions association on monovalent and divalent cations adsorption at mica-aqueous interface journal August 2018
Direct observation of the dynamics of single metal ions at the interface with solids in aqueous solutions journal February 2017
Mechanisms of classical crystal growth theory explain quartz and silicate dissolution behavior journal October 2005
Tuning ion correlations at an electrified soft interface journal November 2012
Mineral surfaces and bioavailability of heavy metals: A molecular-scale perspective journal March 1999
Electrostatic correlations: from plasma to biology journal September 2002
Intricate coupling between ion–ion and ion–surface correlations in double layers as illustrated by charge inversion—combined effects of strong Coulomb correlations and excluded volume journal September 2009
Screening of a macroion by multivalent ions: Correlation-induced inversion of charge journal November 1999
Hydration and Distribution of Ions at the Mica-Water Interface journal July 2006
Phasing of resonant anomalous X-ray reflectivity spectra and direct Fourier synthesis of element-specific partial structures at buried interfaces journal March 2007
Optimizing a flow-through X-ray transmission cell for studies of temporal and spatial variations of ion distributions at mineral–water interfaces journal November 2012
Why Mineral Interfaces Matter journal March 2014
In Situ X-ray Absorption Study of Surface Complexes: Selenium Oxyanions on agr-FeOOH journal November 1987
Tracking Diverse Minerals, Hungry Organisms, and Dangerous Contaminants Using Reactive Transport Models journal April 2019