Extreme Li-Mg selectivity via precise ion size differentiation of polyamide membrane

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Март 20, 2024

Achieving high selectivity of Li

Язык: Английский

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Ion Exchange Membranes: Constructing and Tuning Ion Transport Channels

Advanced Functional Materials, Год журнала: 2022, Номер 32(52)

Опубликована: Окт. 17, 2022

Abstract Ion exchange membranes (IEMs) that can selectively transport ions are crucial to a variety of applications, such as ion extraction/separation, fuel cells, redox flow batteries, and water electrolysis. IEM performance, in terms membrane permeability/conductivity selectivity, relies heavily on the formation effective channels within membranes, there exists tradeoff between which obstructs development widespread adoption IEM‐based processes. To overcome this advance IEM‐related extensive research efforts devoted construction tuning channels, various strategies proposed. These mainly include 1) inducing microphase separation by properly regulating polymer architecture, 2) introducing third phase/region for transfer, 3) realizing high free volume with polyrotaxanes or polymers sterically bulky groups, 4) constructing nanoporous materials. outlined summarized review. Perspectives future directions also discussed.

Язык: Английский

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Advanced Lithium Extraction Membranes Derived from Tagged‐Modification of Polyamide Networks

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(48)

Опубликована: Окт. 5, 2023

Abstract Efficient Mg 2+ /Li + separation is crucial to combating the lithium shortage worldwide, yet current nanofiltration membranes suffer from low efficacy and/or poor scalability, because desirable properties of are entangled and there a trade‐off. This work reports “tagged‐modification” approach tackle challenge. A mixture 3‐bromo‐trimethylpropan‐1‐aminium bromide (E 1 ) 3‐aminopropyltrimethylazanium 2 was designed modify polyethylenimine – trimesoyl chloride (PEI‐TMC) membranes. E reacted with PEI TMC, respectively, thus, membrane (hydrophilicity, pore sizes, charge) were untangled intensified simultaneously. The permeance (34.3 L m −2 h −1 bar selectivity (23.2) modified about 4 times higher than pristine membrane, they remain stable in 30‐days test. highest among all analogous tagged‐modification method enables preparation large‐area modules that produce high‐purity carbonate (Li CO 3 simulated brine.

Язык: Английский

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Regulating ion affinity and dehydration of metal-organic framework sub-nanochannels for high-precision ion separation

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Март 8, 2024

Abstract Membrane consisting of ordered sub-nanochannels has been pursued in ion separation technology to achieve applications including desalination, environment management, and energy conversion. However, high-precision not yet achieved owing the lack deep understanding transport mechanism confined environments. Biological channels can conduct ions with ultrahigh permeability selectivity, which is inseparable from important role channel size “ion-channel” interaction. Here, inspired by biological systems, we report monovalent divalent cations functionalized metal-organic framework (MOF) membranes (UiO-66-(X) 2 , X = NH SH, OH OCH 3 ). We find that functional group (X) MOF sub-nanochannel synergistically regulate binding affinity dehydration process, key enlarging activation difference between target interference improve performance. The K + /Mg 2+ selectivity UiO-66-(OCH ) membrane reaches as high 1567.8. This work provides a gateway development membranes.

Язык: Английский

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Polycage membranes for precise molecular separation and catalysis

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Май 30, 2023

The evolution of the chemical and pharmaceutical industry requires effective less energy-intensive separation technologies. Engineering smart materials at a large scale with tunable properties for molecular is challenging step to materialize this goal. Herein, we report thin film composite membranes prepared by interfacial polymerization porous organic cages (POCs) (RCC3 tren cages). Ultrathin crosslinked polycage selective layers (thickness as low 9.5 nm) are obtained high permeance strict sieving nanofiltration. A dual function achieved combining catalysis. This demonstrated impregnating highly catalytically active Pd nanoclusters ( ~ 0.7 nm). While membrane promotes precise separation, its catalytic activity enables surface self-cleaning, reacting any potentially adsorbed dye recovering original performance. strategy opens opportunities development other different functions well-tailored abilities.

Язык: Английский

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Dehydration-enhanced ion-pore interactions dominate anion transport and selectivity in nanochannels

Science Advances, Год журнала: 2023, Номер 9(27)

Опубликована: Июль 7, 2023

State-of-the-art ion-selective membranes with ultrahigh precision are of significance for water desalination and energy conservation, but their development is limited by the lack understanding mechanisms ion transport at subnanometer scale. Herein, we investigate three typical anions (F − , Cl Br ) under confinement using in situ liquid time-of-flight secondary mass spectrometry combination transition-state theory. The operando analysis reveals that dehydration related ion-pore interactions govern anion-selective transport. For strongly hydrated ions [(H 2 O) n F (H ], enhances effective charge thus electrostatic membrane, observed as an increase decomposed from electrostatics, leading to more hindered Contrarily, weakly ] have greater permeability they allow intact hydration structure during due smaller size most right-skewed distribution. Our work demonstrates precisely regulating maximize difference could enable ideal membranes.

Язык: Английский

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A review of the nanofiltration membrane for magnesium and lithium separation from salt-lake brine

Separation and Purification Technology, Год журнала: 2024, Номер 354, С. 129169 - 129169

Опубликована: Авг. 14, 2024

Язык: Английский

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Enhancing ion selectivity by tuning solvation abilities of covalent-organic-framework membranes

Proceedings of the National Academy of Sciences, Год журнала: 2024, Номер 121(8)

Опубликована: Фев. 13, 2024

Understanding the molecular-level mechanisms involved in transmembrane ion selectivity is essential for optimizing membrane separation performance. In this study, we reveal our observations regarding behavior of Li + and Mg 2+ ions as a response to changing pore solvation abilities covalent-organic-framework (COF) membranes. These were manipulated by adjusting lengths oligoether segments attached channels. Through comparative experiments, able unravel relationships between ability various transport properties, such partitioning, conduction, selectivity. We also emphasize significance competition with solvating modulating found that increasing length chain facilitated transport; however, it was COF chains containing two ethylene oxide units exhibited most pronounced discrepancy energy barrier , resulting highest factor among all evaluated Remarkably, under electro-driven binary-salt conditions, specific achieved an exceptional /Mg up 1352, making one effective membranes available separation. The insights gained from study significantly contribute advancing understanding selective within confined nanospaces provide valuable design principles developing highly

Язык: Английский

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Perfect confinement of crown ethers in MOF membrane for complete dehydration and fast transport of monovalent ions

Science Advances, Год журнала: 2024, Номер 10(19)

Опубликована: Май 8, 2024

Fast transport of monovalent ions is imperative in selective ion separation based on membranes. Here, we report the situ growth crown ether@UiO-66 membranes at a mild condition, where dibenzo-18-crown-6 (DB18C6) or dibenzo-15-crown-5 perfectly confined UiO-66 cavity. Crown exhibit enhanced rates and mono-/divalent selectivity, due to combination size sieving interaction screening effects toward complete dehydration. Specifically, DB18C6@UiO-66 membrane shows permeation rate (e.g., K

Язык: Английский

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Selective ion transport through hydrated micropores in polymer membranes

Nature, Год журнала: 2024, Номер 635(8038), С. 353 - 358

Опубликована: Ноя. 6, 2024

Abstract Ion-conducting polymer membranes are essential in many separation processes and electrochemical devices, including electrodialysis 1 , redox flow batteries 2 fuel cells 3 electrolysers 4,5 . Controlling ion transport selectivity these largely hinges on the manipulation of pore size. Although membrane structures can be designed dry state 6 they redefined upon hydration owing to swelling electrolyte solutions. Strategies control a deeper understanding structure evolution vital for accurate size tuning. Here we report containing pendant groups varying hydrophobicity, strategically positioned near charged regulate their capacity swelling. Modulation hydrated micropore (less than two nanometres) enables direct over water across broad length scales, as quantified by spectroscopic computational methods. Ion improves hydration-restrained pores created more hydrophobic groups. These highly interconnected channels, with tuned gate sizes, show higher ionic conductivity orders-of-magnitude lower permeation rates redox-active species compared conventional membranes, enabling stable cycling energy-dense aqueous organic batteries. This tailoring approach provides promising avenue precisely controlled molecular functions.

Язык: Английский

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