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Title: Highly selective ion separations based on counter-flow electromigration in nanoporous membranes

Journal Article · · Journal of Membrane Science
 [1]; ORCiD logo [2]; ORCiD logo [3];  [4]
  1. Univ. of Notre Dame, IN (United States); University of Notre Dame
  2. National Academy of Sciences of Ukraine (NASU), Kyiv (Ukraine)
  3. Polytechnic University of Catalonia, Barcelona (Spain); ICREA, Barcelona (Spain)
  4. Univ. of Notre Dame, IN (United States)

Highly selective ion separations are vital for recovering important salts, and membrane-based techniques may enable environmentally friendly ion separations that operate continuously. This study demonstrates that simply opposing convective flow with electromigration in track-etched membranes leads to remarkable selectivities among monovalent ions. Because the membrane-pore diameters are orders of magnitude larger than the ion diameters, advection moves all ions at the same velocity, whereas electrophoretic velocities are proportional to ion mobilities. Thus during counter-flow cation electromigration, less mobile cations have lower electromigration velocity components and pass through porous membranes more rapidly than more mobile cations. Using membranes with 400 nm pores, counter-flow electromigration gives Li+/K+ selectivities of 100 and Li+/Na+ selectivities around 30 in mixed-salt studies. In this work, numerical simulations based on the extended Nernst-Planck equation agree with trends in experimental data and highlight the importance of high Péclet numbers, high current-to-flow ratios, and uniform current distributions for achieving high selectivities. Importantly, experimental separations give high selectivities at 0.3 M ionic strength and low Li+/K+ ratios, which suggest these methods may also work in brine solutions. Nevertheless, energy costs for such separations are high.

Research Organization:
Univ. of Notre Dame, IN (United States)
Sponsoring Organization:
Spanish Ministry of Economy and Competitiveness; The National Research Foundation of Ukraine (NRFU); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
SC0017618
OSTI ID:
1868530
Journal Information:
Journal of Membrane Science, Journal Name: Journal of Membrane Science Vol. 638; ISSN 0376-7388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (39)

Polystyrene Sulfonate Threaded through a Metal-Organic Framework Membrane for Fast and Selective Lithium-Ion Separation journal November 2016
Separation and purification of lithium by solvent extraction and supported liquid membrane, analysis of their mechanism: a review: Separation and purification of lithium journal April 2016
Preparative scale mass spectrometry: A brief history of the calutron journal July 2020
Ion separations with membranes journal September 2020
A real-time vision system for defect inspection in cast extrusion manufacturing process journal January 2008
Novel lithium selective composite membranes: synthesis, characterization and validation tests in dialysis journal September 2020
Porosity dependence of pore entry shape in track-etched membranes by image analysis journal August 1994
Contribution of convection, diffusion and migration to electrolyte transport through nanofiltration membranes journal March 2003
Two years of nanofiltration at the Méry-sur-Oise plant, France journal September 2002
Nanopores and Channels for Biomimetics and Biomedical Engineering journal February 2020
Positive charged PEI-TMC composite nanofiltration membrane for separation of Li+ and Mg2+ from brine with high Mg2+/Li+ ratio journal January 2019
Separation of alkali metal cations by a supported liquid membrane (SLM) operating under electro dialysis (ED) conditions journal December 2020
Membrane technologies for Li+/Mg2+ separation from salt-lake brines and seawater: A comprehensive review journal January 2020
Recycling of lithium-ion batteries: Recent advances and perspectives journal September 2018
Investigating transport properties of nanofiltration membranes by means of a steric, electric and dielectric exclusion model journal April 2005
Development of recovering lithium from brines by selective-electrodialysis: Effect of coexisting cations on the migration of lithium journal February 2018
Selectivity of ion exchange membranes: A review journal June 2018
Highly selective separation of singly charged cations by countercurrent electromigration with a track-etched membrane journal October 2021
A critical review on solvent extraction of rare earths from aqueous solutions journal February 2014
Recovery and recycling of lithium: A review journal January 2017
A positively charged composite nanofiltration membrane modified by EDTA for LiCl/MgCl 2 separation journal October 2017
Separation of monovalent and divalent ions from aqueous solution by electrodialysis and nanofiltration journal March 2004
Peer Reviewed: The New Wave of Ion-Selective Electrodes journal August 2002
Modulation of Ionic Current Rectification in Ultrashort Conical Nanopores journal November 2020
Modification of Cation-Exchange Membranes with Polyelectrolyte Multilayers to Tune Ion Selectivity in Capacitive Deionization journal June 2020
Density, Viscosity, and Electrical Conductivity of Aqueous Solutions of Lithium Sulfate journal July 1995
Seven chemical separations to change the world journal April 2016
Tunable sieving of ions using graphene oxide membranes journal April 2017
Slowing down DNA translocation through solid-state nanopores by edge-field leakage journal January 2021
Taking advantage of luminescent lanthanide ions journal January 2005
Sequential Precipitation of Iron, Copper, and Zinc from Wastewater for Metal Recovery journal January 2019
Separation of Ions Using Countercurrent Electrolysis in a Thin, Porous Membrane journal July 1982
Experimental Verification of Separation of Ions Using Countercurrent Electrolysis in a Thin, Porous Membrane journal March 1983
Biomaterials and Biotechnologies Based on Nanotube Membranes journal October 2005
Dispersion of soluble matter in solvent flowing slowly through a tube journal August 1953
Biomimetic potassium-selective nanopores journal February 2019
Model of Competitive Ion Transfer in an Electro-Baromembrane System with Track-Etched Membrane journal March 2021
1998 W.A.E. McBryde Medal Lecture: Searching for the Holy Grail in analytical separations journal March 1999
The History of Poiseuille's Law journal January 1993