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2021-02-15
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info:eu-repo/semantics/openAccess
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Elsevier
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Resumen
To meet the exponentially rising demand for lithium, it becomes vital to develop environmentally friendly processes for its recovery from brines, salt lakes and/or seawater. In this work, novel composite lithium transport selective polymeric membranes were developed to separate lithium and magnesium ions. Hydrogen manganese oxide (HMO) (at weight percentage from 0 to 25%), polystyrene sulfonate sodium salt (PSS–Na) and lithium triflate (LiCF3SO3) were added into the sulfonated polyethersulfone (SPES) matrix to prepare composite membranes. The developed membranes showed high mechanical stability and a homogeneous distribution of HMO. The most promising membrane, containing 20% (w/w) of HMO, showed an almost 13 times higher Li+ ionic conductivity (8.28 mS/cm) compared to the control composite membrane (without HMO) and an average ideal selectivity of 11.75 for the Li+/Mg2+ pair. The composite-20% membrane had the lowest intermolecular distance between the polymer chains (according to X-ray diffraction (XRD) analysis), the most flexible structure (lowest Tg) and showed the homogeneous dispersion of HMO (SEM images), which explains its highest Li+/Mg2+ selectivity among the tested membranes. The lithium ion transport performance and separation efficiency were investigated through diffusion dialysis experiments, under different operating conditions. A binary separation factor of 9.10 for Li+/Mg2+ and Li+ molar flux of 0.026 mol/(m2.h) was achieved without applying any external potential difference. When an external potential difference of 0.2 V was applied, the binary separation factor of Li+/Mg2+ pair was 5, while the Li+ molar flux increased almost 5 times. The obtained results provide the basis to design and develop composite lithium transport selective polymeric membranes, thus representing a promising step for future implementation of such membranes to recover lithium from saline streams.
Descripción
This is the accepted manuscript of the article. The registered version was first published in Journal of Membrane Science, 620, 118891, is available online at the publisher's website: https://doi.org/10.1016/j.memsci.2020.118891
Este es el manuscrito aceptado del artículo. La versión registrada fue publicada por primera vez en Journal of Membrane Science, 620, 118891, está disponible en línea en el sitio web del editor: https://doi.org/10.1016/j.memsci.2020.118891
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 869467 (SEArcularMINE). This work was supported by the Associate Laboratory for Green Chemistry- LAQV, which is financed by Portuguese national funds from FCT/MCTES (UID/QUI/50006/2019). This work was also supported by “Programa Operacional Regional de Lisboa, na componente FEDER” and “Fundação para a Ciência e Tecnologia, I.P.” through research project PTDC/EQU-EPQ/29579/2017. S. Pawlowski acknowledges Fundação para a Ciência e Tecnologia, I.P. for his contracts CEECIND/01617/2017 and CEECIND/00340/2018. iNOVA4Health – UIDB/Multi/04462/2020, a program financially supported by Fundação para a Ciência e Tecnologia is acknowledged. Funding from INTERFACE Programme, through the Innovation, Technology and Circular Economy Fund (FITEC), is also gratefully acknowledged. The authors acknowledge Professor Vítor D. Alves, from Instituto Superior de Agronomia, Universidade de Lisboa, for the support to analysing mechanical properties.
Este es el manuscrito aceptado del artículo. La versión registrada fue publicada por primera vez en Journal of Membrane Science, 620, 118891, está disponible en línea en el sitio web del editor: https://doi.org/10.1016/j.memsci.2020.118891
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 869467 (SEArcularMINE). This work was supported by the Associate Laboratory for Green Chemistry- LAQV, which is financed by Portuguese national funds from FCT/MCTES (UID/QUI/50006/2019). This work was also supported by “Programa Operacional Regional de Lisboa, na componente FEDER” and “Fundação para a Ciência e Tecnologia, I.P.” through research project PTDC/EQU-EPQ/29579/2017. S. Pawlowski acknowledges Fundação para a Ciência e Tecnologia, I.P. for his contracts CEECIND/01617/2017 and CEECIND/00340/2018. iNOVA4Health – UIDB/Multi/04462/2020, a program financially supported by Fundação para a Ciência e Tecnologia is acknowledged. Funding from INTERFACE Programme, through the Innovation, Technology and Circular Economy Fund (FITEC), is also gratefully acknowledged. The authors acknowledge Professor Vítor D. Alves, from Instituto Superior de Agronomia, Universidade de Lisboa, for the support to analysing mechanical properties.
Categorías UNESCO
Palabras clave
Lithium recovery, Composite membranes, Lithium ion sieves (LIS), Sea mining, Diffusion dialysis
Citación
Saif, Huertas, Pawlowski, Crespo, & Velizarov. (2021). Development of highly selective composite polymeric membranes for Li+/Mg2+ separation. Journal of Membrane Science, 620. https://doi.org/10.1016/J.MEMSCI.2020.118891
Centro
Facultad de Ciencias
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Ciencias y Técnicas Fisicoquímicas