Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Heavy Versus Light Lanthanide Selectivity for Graphene Oxide Films is Concentration Dependent

Journal Article · · Journal of Physical Chemistry. C

Rare earths are important materials in various technologies such as catalysis and optoelectronics. Graphene oxide (GO) is a promising material for separation applications, including the isolation of lanthanides from complex mixtures. Previous works using fatty acid monolayers have demonstrated preferential heavy versus light lanthanide adsorption, which has been attributed to differences in lanthanide ion size. In this work, we used interfacial X-ray fluorescence measurements to reveal that GO thin films at the air/water interface have no lanthanide selectivity for dilute subphases. However, at high subphase concentrations, ~8 times more Lu is adsorbed than La. By comparing the GO results with an ideal monolayer with a carboxylic acid headgroup, arachidic acid (AA), we demonstrate that the number of Lu ions adsorbed to GO is significantly higher than the number expected to compensate for the surface charge. Vibrational sum frequency generation (SFG) spectroscopy results on both GO thin films and AA monolayers reveal a red-shifted SFG signal in the OH region, which we attribute to partial dehydration of the adsorbed ions and carboxylic acid headgroups. Liquid surface X-ray reflectivity data show that the GO thin film structure does not significantly change between the very dilute and concentrated subphases. We speculate that the functional groups of both GO and AA facilitate cation dehydration, which is essential for ion adsorption. Heavy lanthanide Lu has stronger ion–ion correlations that can overcome the electrostatic repulsion between cations at higher concentrations compared to light lanthanide La, meaning GO and AA can exhibit apparent overcharge with Lu. Lastly, the layered structure of the GO films and reactive chemical nature of GO itself can accommodate ion adsorption.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2367267
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 29 Vol. 127; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (60)

Hydration counteracts the separation of lanthanides by solvent extraction journal July 2020
The Lanthanide Contraction beyond Coordination Chemistry journal April 2016
A Dynamic Model to Explain Hydration Behaviour along the Lanthanide Series journal March 2008
Synthesis and characterization of semi-permeable graphene/graphene oxide membranes for water desalination journal April 2020
Selective sorption of uranium from aqueous solution by graphene oxide-modified materials journal February 2018
A simple empirical model describing the thermodynamics of hydration of ions of widely varying charges, sizes, and shapes journal August 1994
Hydration of lanthanides and actinides in solution journal March 1992
Liquid Surface X-Ray Scattering book June 2018
The chemical and structural analysis of graphene oxide with different degrees of oxidation journal March 2013
Synthesis of graphene oxide sheets with controlled sizes from sieved graphite flakes journal December 2016
New insights into the mechanism of graphene oxide and radionuclide interaction journal March 2020
Effects of ion adsorption on graphene oxide films and interfacial water structure: A molecular-scale description journal August 2022
Macroscopic and molecular study of the sorption and co-sorption of graphene oxide and Eu(III) onto layered double hydroxides journal October 2017
Defective graphene nanosheets for drinking water purification: Adsorption mechanism, performance, and recovery journal September 2021
Sorption of tetravalent thorium on muscovite journal July 2012
La3+ and Y3+ interactions with the carboxylic acid moiety at the liquid/vapor interface: Identification of binding complexes, charge reversal, and detection limits journal February 2022
A critical review on solvent extraction of rare earths from aqueous solutions journal February 2014
Rapid and highly efficient removal of Eu(III) from aqueous solutions using graphene oxide journal March 2017
A review on heavy metal ions adsorption from water by graphene oxide and its composites journal March 2017
Surface Complexation Modeling of Eu(III) and U(VI) Interactions with Graphene Oxide journal January 2016
Lanthanide Chemistry: From Coordination in Chemical Complexes Shaping Our Technology to Coordination in Enzymes Shaping Bacterial Metabolism journal September 2016
“Straining” to Separate the Rare Earths: How the Lanthanide Contraction Impacts Chelation by Diglycolamide Ligands journal November 2016
Comparative CHARMM and AMOEBA Simulations of Lanthanide Hydration Energetics and Experimental Aqueous-Solution Structures journal February 2018
Surface pKa of Saturated Carboxylic Acids at the Air/Water Interface: A Quantum Chemical Approach journal June 2020
Chemical Potential Driven Reorganization of Anions between Stern and Diffuse Layers at the Air/Water Interface journal January 2022
Probing the Structure of Water at the Interface with Graphene Oxide Using Sum Frequency Generation Vibrational Spectroscopy journal January 2022
Heavy Anionic Complex Creates a Unique Water Structure at a Soft Charged Interface journal November 2018
The Role of Specific Ion Effects in Ion Transport: The Case of Nitrate and Thiocyanate journal December 2019
Observation of Extremely Weakly Interacting OH (∼3600 cm –1 ) in the Vicinity of High Charge Density Metal Ions (M z + ; z = 1, 2, 3): A Structural Heterogeneity in the Extended Hydration Shell journal January 2020
Thiocyanate Ions Form Antiparallel Populations at the Concentrated Electrolyte/Charged Surfactant Interface journal June 2022
Elucidating Trivalent Ion Adsorption at Floating Carboxylic Acid Monolayers: Charge Reversal or Water Reorganization? journal April 2023
Spontaneous and Ion-Specific Formation of Inverted Bilayers at Air/Aqueous Interface journal April 2022
Observation of Ordered Structures in Counterion Layers near Wet Charged Surfaces: A Potential Mechanism for Charge Inversion journal December 2015
Atomic Number Dependent “Structural Transitions” in Ordered Lanthanide Monolayers: Role of the Hydration Shell journal January 2017
Understanding the Role of Oxidative Debris on the Structure of Graphene Oxide Films at the Air–Water Interface: A Neutron Reflectivity Study journal May 2020
Enhanced Sorption of Radionuclides by Defect-Rich Graphene Oxide journal September 2020
Origins of Clustering of Metalate–Extractant Complexes in Liquid–Liquid Extraction journal April 2021
Convenient Confinement: Interplay of Solution Conditions and Graphene Oxide Film Structure on Rare Earth Separations journal December 2022
Linear Free Energy Relationship for Actinide Sorption to Graphene Oxide journal August 2018
Antagonistic Role of Aqueous Complexation in the Solvent Extraction and Separation of Rare Earth Ions journal October 2021
Vibrational Sum Frequency Spectroscopy Studies of the Influence of Solutes and Phospholipids at Vapor/Water Interfaces Relevant to Biological and Environmental Systems journal January 2014
Coordination Chemistry of Trivalent Lanthanide and Actinide Ions in Dilute and Concentrated Chloride Solutions journal February 2000
Graphene Oxide as a Pb(II) Separation Medium: Has Part of the Story Been Overlooked? journal April 2021
Size Selective Ligand Tug of War Strategy to Separate Rare Earth Elements journal January 2023
Structure of Graphite Oxide Revisited journal June 1998
Graphene Oxide Thin Films: Influence of Chemical Structure and Deposition Methodology journal February 2015
Second-order spectral lineshapes from charged interfaces journal October 2017
Graphene oxide for effective radionuclide removal journal January 2013
Graphene-based membranes journal January 2015
How exfoliated graphene oxide nanosheets organize at the water interface: evidence for a spontaneous bilayer self-assembly journal January 2017
Effective removal of cesium by pristine graphene oxide: performance, characterizations and mechanisms journal January 2017
Reactive events at the graphene oxide–water interface journal January 2021
The coordination (hydration) of rare earth ions in aqueous chloride solutions from x ray diffraction. I.TbCl 3 ,DyCl 3 , ErCl 3 ,TmCl 3 ,and LuCl 3 journal March 1979
The coordination (hydration) of rare earth ions in aqueous chloride solutions from x‐ray diffraction. II. LaCl 3 , PrCl 3 , and NdCl 3 a) journal April 1979
Molecular mechanism of charge inversion revealed by polar orientation of interfacial water molecules: A heterodyne-detected vibrational sum frequency generation study journal July 2018
Ion correlations drive charge overscreening and heterogeneous nucleation at solid–aqueous electrolyte interfaces journal August 2021
Electrostatic Origin of Element Selectivity during Rare Earth Adsorption journal February 2019
Stochastic fitting of specular X-ray reflectivity data using StochFit journal November 2008
Structural parameters of close surroundings of Sr2+ and Ba2+ ions in aqueous solutions of their salts journal February 2011
Second Harmonic Generation, Sum Frequency Generation, and χ (3) : Dissecting Environmental Interfaces with a Nonlinear Optical Swiss Army Knife journal May 2009

Figures / Tables (5)