Lithium purification from aqueous solutions using bioinspired redox-active melanin membranes
Abstract
Abstract The separation of lithium from magnesium ions in salt brines is an important step in producing raw lithium for prospective use in electrochemical storage systems. Liquid–liquid extraction of Mg 2+ ions from Li + ions is challenging because of comparable thermodynamic behavior in aqueous solutions. Removing Mg 2+ ions from brines using consumable ion‐exchange membranes is also a challenging prospect due to poor chemical selectivity and compromised sustainability. Here, we propose the use of redox‐active catechols in the form of melanin pigments for selective removal of Mg 2+ ions from aqueous solutions. Synthetic melanin films are oxidatively polymerized on stainless steel meshes from aqueous solutions of dopamine precursors to create electrochemically functionalized polydopamine membranes. The binding selectivity of redox‐active catechol‐bearing polydopamine melanin for Mg 2+ ions in aqueous solutions was measured as a function of electrochemical cycling. The binding kinetics of Mg 2+ ions to polydopamine pigments was measured. Mg 2+ ions binding selectivity to polydopamine in mixed aqueous solutions containing both Li + and Mg 2+ ions were also measured. Additionally, the equilibrium binding concentrations of Mg 2+ ions to polydopamine were achieved very rapidly (<1 min). Redox‐active polydopamine membranes therefore show promise as functional materials for the separationmore »
- Authors:
-
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States); McGowan Inst. of Regenerative Medicine, Pittsburgh, PA (United States)
- Publication Date:
- Research Org.:
- Aquion Energy Inc., Pittsburgh, PA (United States)
- Sponsoring Org.:
- USDOE Office of Electricity (OE); American Chemical Society; Carnegie Mellon University; Pennsylvania Department of Community and Economic Development
- OSTI Identifier:
- 1533203
- Alternate Identifier(s):
- OSTI ID: 1401686
- Grant/Contract Number:
- OE0000226; PRF51980DN17; DE‐OE0000226
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Polymer International
- Additional Journal Information:
- Journal Volume: 65; Journal Issue: 11; Journal ID: ISSN 0959-8103
- Publisher:
- Society of Chemical Industry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; polymer science; melanin; catechol; lithium; battery; electrochemistry
Citation Formats
Park, Hang‐Ah, Kim, Young Jo, Kwon, Ik Soo, Klosterman, Luke, and Bettinger, Christopher J. Lithium purification from aqueous solutions using bioinspired redox-active melanin membranes. United States: N. p., 2016.
Web. doi:10.1002/pi.5184.
Park, Hang‐Ah, Kim, Young Jo, Kwon, Ik Soo, Klosterman, Luke, & Bettinger, Christopher J. Lithium purification from aqueous solutions using bioinspired redox-active melanin membranes. United States. https://doi.org/10.1002/pi.5184
Park, Hang‐Ah, Kim, Young Jo, Kwon, Ik Soo, Klosterman, Luke, and Bettinger, Christopher J. Fri .
"Lithium purification from aqueous solutions using bioinspired redox-active melanin membranes". United States. https://doi.org/10.1002/pi.5184. https://www.osti.gov/servlets/purl/1533203.
@article{osti_1533203,
title = {Lithium purification from aqueous solutions using bioinspired redox-active melanin membranes},
author = {Park, Hang‐Ah and Kim, Young Jo and Kwon, Ik Soo and Klosterman, Luke and Bettinger, Christopher J.},
abstractNote = {Abstract The separation of lithium from magnesium ions in salt brines is an important step in producing raw lithium for prospective use in electrochemical storage systems. Liquid–liquid extraction of Mg 2+ ions from Li + ions is challenging because of comparable thermodynamic behavior in aqueous solutions. Removing Mg 2+ ions from brines using consumable ion‐exchange membranes is also a challenging prospect due to poor chemical selectivity and compromised sustainability. Here, we propose the use of redox‐active catechols in the form of melanin pigments for selective removal of Mg 2+ ions from aqueous solutions. Synthetic melanin films are oxidatively polymerized on stainless steel meshes from aqueous solutions of dopamine precursors to create electrochemically functionalized polydopamine membranes. The binding selectivity of redox‐active catechol‐bearing polydopamine melanin for Mg 2+ ions in aqueous solutions was measured as a function of electrochemical cycling. The binding kinetics of Mg 2+ ions to polydopamine pigments was measured. Mg 2+ ions binding selectivity to polydopamine in mixed aqueous solutions containing both Li + and Mg 2+ ions were also measured. Additionally, the equilibrium binding concentrations of Mg 2+ ions to polydopamine were achieved very rapidly (<1 min). Redox‐active polydopamine membranes therefore show promise as functional materials for the separation of Mg 2+ and Li + ions in aqueous solutions. © 2016 Society of Chemical Industry},
doi = {10.1002/pi.5184},
journal = {Polymer International},
number = 11,
volume = 65,
place = {United States},
year = {Fri Jun 17 00:00:00 EDT 2016},
month = {Fri Jun 17 00:00:00 EDT 2016}
}
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