Polyamide membranes with nanoscale ordered structures for fast permeation and highly selective ion-ion separation

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Feb. 27, 2023

Fast permeation and effective solute-solute separation provide the opportunities for sustainable water treatment, but they are hindered by ineffective membranes. We present here construction of a nanofiltration membrane with fast permeation, high rejection, precise Cl-/SO42- spatial temporal control interfacial polymerization via graphitic carbon nitride (g-C3N4). The g-C3N4 nanosheet binds preferentially piperazine tiles water-hexane interface as revealed molecular dynamics studies, thus lowering diffusion rate PIP one order magnitude restricting its pathways towards hexane phase. As result, membranes nanoscale ordered hollow structure created. Transport mechanism across is clarified using computational fluid simulation. Increased surface area, lower thickness, identified key contributors to permeance 105 L m2·h-1·bar-1 Na2SO4 rejection 99.4% selectivity 130, which superior state-of-the-art NF Our approach tuning microstructure enables development ultra-permeability excellent ion-ion separation, purification, desalination, organics removal.

Language: Английский

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Recent advances in green hydrogen production, storage and commercial-scale use via catalytic ammonia cracking

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 473, P. 145381 - 145381

Published: Aug. 11, 2023

Language: Английский

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Nanocomposite hydrogel engineered hierarchical membranes for efficient oil/water separation and heavy metal removal

Journal of Membrane Science, Journal Year: 2022, Volume and Issue: 668, P. 121243 - 121243

Published: Nov. 29, 2022

Language: Английский

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Recent progress of covalent organic frameworks membranes: Design, synthesis, and application in water treatment

Eco-Environment & Health, Journal Year: 2023, Volume and Issue: 2(3), P. 117 - 130

Published: July 13, 2023

To date, significant efforts have been devoted to eliminating hazardous components purify wastewater through the development of various nanomaterials. Covalent organic frameworks (COFs), an important branch porous crystalline family, possess peculiarity ultrahigh surface area, adjustable pore size, and facile functionality. Exciting studies from design fabrication potential applications in water treatment by COF-based membranes (COMs) emerged. This review summarizes preparation strategies synthesis mechanisms for COMs, including layer-by-layer stacking, situ growth, interfacial polymerization, electrochemical synthesis, briefly describes advanced characterization techniques COMs. Moreover, application COMs heavy metal removal, dye separation, purification radionuclides, pollutant detection, sea desalination, so on, is described discussed. Finally, perspectives on future opportunities designing proposed.

Language: Английский

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3D covalent organic framework membrane with fast and selective ion transport

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Sept. 22, 2023

3D ionic covalent organic framework (COF) membranes, which are envisioned to be able break the trade-off between ion conductivity and selectivity, waiting for exploitation. Herein, we report fabrication of a sulfonic acid-functionalized COF membrane (3D SCOF) efficient selective transport, using dual acid-mediated interfacial polymerization strategy. The SCOF membranes possess highly interconnected transport channels, ultramicroporous pore sizes (0.97 nm), abundant sulfonate groups (with high exchange capacity 4.1 mmol g-1), leading proton 843 mS cm-1 at 90 °C. When utilized in osmotic energy conversion, power density 21.2 W m-2, remarkable selectivity 0.976 thus an exceptional conversion efficiency 45.3% simultaneously achieved. This work provides alternative approach promotes applications COFs separation.

Language: Английский

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Electrochemical Interfacial Polymerization toward Ultrathin COF Membranes for Brine Desalination

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(13)

Published: Feb. 4, 2023

Ultrathin covalent organic framework (COF) membranes are urgently demanded in molecular/ionic separations. Herein, we reported an electrochemical interfacial polymerization strategy to fabricate ultrathin COF with thickness of 85 nm, by actively manipulate self-healing effect and self-inhibiting effect. The resulting membrane exhibited superior performance brine desalination the permeation flux 92 kg m-2 h-1 rejection 99.96 %. Our enriches fabrication approach facilitates rational design membranes.

Language: Английский

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Large‐Area Fabrication of Ultrathin Metal‐Organic Framework Membranes

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(18)

Published: Feb. 28, 2023

Metal-organic framework (MOF)-based membranes, featuring potential molecular sieving effects and therefore capable of surmounting the ubiquitous trade-off between membrane selectivity permeability, hold great promise for multitudinous chemical separations. Nevertheless, it remains highly challenging large-area fabrication ultrathin MOF membranes with variable thickness, homogeneity, preferential orientation. Herein, this work reports facile (down to 20 nm) NUS-8 in (>200 cm2 ) yet homogeneity texture along (00l) direction due superior solution processability as-synthesized nanosheets. The resultant good adhesion properties certain flexibility exhibit excellent rejections (>98% Mg2+ Al3+ , dyes weights larger than 585.5 g mol-1 toward aqueous separation various metal ions at modest permeance (1-3.2 L m-2 h-1 bar-1 well-aligned structures. Such performance outstands among polymetric thin-film composite mixed matrix other reported literature. mechanism is reasonably discussed based on experimental theoretical results. This study opens up novel perspectives preparing using MOFs.

Language: Английский

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Discontinuous cooperative imprinting idea based on MXene-nanocomposite membrane for high structurally stable recognition and separation of shikimic acid

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 460, P. 141891 - 141891

Published: Feb. 13, 2023

Language: Английский

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Step‐Nucleation In Situ Self‐Repair to Prepare Rollable Large‐Area Ultrathin MOF Membranes

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(48)

Published: Aug. 29, 2023

Ultrathin membranes with ultrahigh permeance and good gas selectivity have the potential to greatly decrease separation process costs, but it requires practical preparation of large area for implementation. Metal-organic frameworks (MOFs) are very attractive membrane applications. However, date, largest MOF reported in literature is only about 100 cm2 . In present study, a new step-nucleation situ self-repair strategy proposed that enables large-area (2400 ) ultrathin rollable deposited on an inexpensive flexible polymer support layer first time, combining polyvinyl alcohol (PVA)-metal-ion pure metal-ion layer. The main role act as nucleation sites growth, while PVA-metal-ion acts slow-release source, which supplements crystal repair any defects occurring. Membrane modules necessary components applications, spiral-wound among most common module formats widely applied separation. A 4800 was successfully prepared, demonstrating implementation membranes.

Language: Английский

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Recent advances of the interfacial polymerization process in gas separation membranes fabrication

Journal of Membrane Science, Journal Year: 2023, Volume and Issue: 683, P. 121854 - 121854

Published: June 16, 2023

Language: Английский

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