A novel nanofiltration membrane with [MimAP][Tf2N] ionic liquid for utilization of lithium from brines with high Mg2+/Li+ ratio

Wu, Huanhuan; Lin, Yakai; Feng, Wenyan; Liu, Tianyin; Wang, Lin; Yao, Hong; Wang, Xiaolin

doi:10.1016/j.memsci.2020.117997

Cited by 106 publications

(27 citation statements)

References 53 publications

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“…The two types of amide bonds show very close FTIR peak around 1640 cm −1 (Figure 1f). [15] In addition, the characteristic absorption of imidazoliums in DAIB may be masked by polyamide, which has been observed in the previous works. [15,39,40] Thus, no new FTIR peak was observed in the DAIB membrane.…”

Section: Membrane Preparation and Characterizationsmentioning

confidence: 65%

“…[15] In addition, the characteristic absorption of imidazoliums in DAIB may be masked by polyamide, which has been observed in the previous works. [15,39,40] Thus, no new FTIR peak was observed in the DAIB membrane. Moreover, the whole network cross-linking degree of DAIB membranes was slightly reduced compared to PEI-TMC membranes without DAIB modification ( Figure S5, Supporting Information).…”

Section: Membrane Preparation and Characterizationsmentioning

confidence: 65%

“…A new FTIR peak at 1640 cm −1 is seen from the DAIB-TMC free-standing film (Figure 1b, right), which is due to the formation of amide bond. [15] To prepare DAIB-modified nanofiltration membranes, aqueous solution of DAIB (2 wt%, pH = 12) was poured onto surfaces of freshly prepared PEI-TMC membranes and kept for 10 min. Condensation reaction occurred between amine groups (from DAIB) and acyl chloride groups (from TMC, Figure S3, Supporting Information).…”

Section: Membrane Preparation and Characterizationsmentioning

confidence: 99%

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A Nano‐Heterogeneous Membrane for Efficient Separation of Lithium from High Magnesium/Lithium Ratio Brine

Peng

Zhen

2021

Adv Funct Materials

158

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Lithium extraction from salt lake brines is highly demanded to circumvent the lithium supply shortage. However, polymer nanofiltration membranes suffer from low lithium permeability while nanofluidic devices are hindered by complicated preparation and miniaturized scales despite high permeability. Here, the authors report a facile strategy to prepare positively charged nanofiltration membranes for ultrapermeable and selective separation of lithium ions from concentrated magnesium/lithium mixtures. A new electrolyte monomer (diaminoethimidazole bromide, DAIB) containing bidentate amine groups is designed to modify pristine polyamide composite membranes. Structure characterizations and simulations show that the DAIB modification brings about nano-heterogeneity that not only improves surface hydrophilicity, but also reduces water transport resistance through the ≈100 nm thick separation layer. Water permeance of the modified membrane improves fivefold and is coupled with good stability in 200-h continuous nanofiltration. It exhibits high lithium flux (0.7 mol m −2 h −1) for brines (Mg 2+ /Li + ratio 20) at 6 bar operation pressure.

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Section: Membrane Preparation and Characterizationsmentioning

confidence: 65%

Section: Membrane Preparation and Characterizationsmentioning

confidence: 65%

Section: Membrane Preparation and Characterizationsmentioning

confidence: 99%

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A Nano‐Heterogeneous Membrane for Efficient Separation of Lithium from High Magnesium/Lithium Ratio Brine

Peng

Zhen

2021

Adv Funct Materials

158

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“…Typical cationic contaminants in lithium-containing brines include Mg 2+ , Na + , K + , and Ca 2+ , with conventional lithium production often focusing on Mg 2+ removal (6,13). While monovalent/divalent separations have been successful over limited concentration ranges using conventional membranes (e.g., charged nanofiltration and ion exchange membranes) (11,(17)(18)(19)(20), monovalent/monovalent (e.g., Li + /Na + ) membrane separations, which would permit the selective removal of Li + from aqueous brines, remain difficult (21). Selectivity limitations between ions of the same valence arise from the fundamental physics governing ion transport through hydrated polymers (22).…”

mentioning

confidence: 99%

Engineering Li/Na selectivity in 12-Crown-4–functionalized polymer membranes

Warnock

Sujanani

Zofchak

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Lithium is widely used in contemporary energy applications, but its isolation from natural reserves is plagued by time-consuming and costly processes. While polymer membranes could, in principle, circumvent these challenges by efficiently extracting lithium from aqueous solutions, they usually exhibit poor ion-specific selectivity. Toward this end, we have incorporated host–guest interactions into a tunable polynorbornene network by copolymerizing 1) 12-crown-4 ligands to impart ion selectivity, 2) poly(ethylene oxide) side chains to control water content, and 3) a crosslinker to form robust solids at room temperature. Single salt transport measurements indicate these materials exhibit unprecedented reverse permeability selectivity (∼2.3) for LiCl over NaCl—the highest documented to date for a dense, water-swollen polymer. As demonstrated by molecular dynamics simulations, this behavior originates from the ability of 12-crown-4 to bind Na+ ions more strongly than Li+ in an aqueous environment, which reduces Na+ mobility (relative to Li+) and offsets the increase in Na+ solubility due to binding with crown ethers. Under mixed salt conditions, 12-crown-4 functionalized membranes showed identical solubility selectivity relative to single salt conditions; however, the permeability and diffusivity selectivity of LiCl over NaCl decreased, presumably due to flux coupling. These results reveal insights for designing advanced membranes with solute-specific selectivity by utilizing host–guest interactions.

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“…The concentration of Mg 2+ ions in most brine is often greater than those of Li + ions [40][41][42]. This results in a competition in the diffusion of the ions during the recovery process.…”

Section: Interaction Of the Polyelectrolyte Chain With Mg 2+ /Li + Ionsmentioning

confidence: 99%

The Role of Sulphonic and Phosphoric Pendant Groups on the Diffusion of Monovalent Ions in Polyelectrolyte Membranes: A Molecular Dynamics Study

et al. 2021

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Lithium-ion consumption has risen significantly in recent years due to its use in portable devices. Alternative sources of lithium, which include the recovery from brine using the sustainable and eco-friendly electrodialysis technology, has been explored. This technology, however, requires effective cation-exchange membranes that allow the selective permeation of lithium ions. In this study, we have investigated, via molecular dynamics simulations, the role of the two common charged groups, the sulfonic and the phosphoric groups, in promoting the adsorption of monovalent ions from brine comprising Li+, Na+, Mg2+, and Ca2+ ions. The analysis of the mean square displacement of the ions revealed that Li+ and Na+ ions exhibit superior diffusion behaviors within the polyelectrolyte system. The O-atoms of the charged groups bind strongly with the divalent ions (Mg2+ and Ca2+), which raises their diffusion energy barrier and consequently lowers their rate of permeation. In contrast, the monovalent ions exhibit weaker interactions, with Na+ being slightly above Li+, enabling the permeation of Li+ ions. The present study demonstrates the role of both charged groups in cation-exchange membranes in promoting the diffusion of Li+ and Na+ ions, and could serve as a guide for the design of effective membranes for the recovery of these ions from brine.

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A novel nanofiltration membrane with [MimAP][Tf2N] ionic liquid for utilization of lithium from brines with high Mg2+/Li+ ratio

Cited by 106 publications

References 53 publications

A Nano‐Heterogeneous Membrane for Efficient Separation of Lithium from High Magnesium/Lithium Ratio Brine

A Nano‐Heterogeneous Membrane for Efficient Separation of Lithium from High Magnesium/Lithium Ratio Brine

Engineering Li/Na selectivity in 12-Crown-4–functionalized polymer membranes

The Role of Sulphonic and Phosphoric Pendant Groups on the Diffusion of Monovalent Ions in Polyelectrolyte Membranes: A Molecular Dynamics Study

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