Ultrathin Metal–Organic Framework Nanosheets Exhibiting Exceptional Catalytic Activity

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(38), P. 17487 - 17495

Published: Sept. 1, 2022

Two-dimensional (2D) metal-organic framework nanosheets (MONs) or membranes are classes of periodic, crystalline polymeric materials that may show unprecedented physicochemical properties due to their modular structures, high surface areas, and aspect ratios. Yet preparing 2D MONs from multiple components two different types polymerization reaction remains challenging less explored. Here, we report the synthesis MOF films via interfacial polymerization, which involves three active monomers for simultaneous polycondensation polycoordination taking place in a confined interface. The well-defined lamellar structure allowed feasible scalable exfoliation produce free-standing with ratio up 2000:1 ultrathin thickness (∼1.7 nm). pore was revealed by high-resolution TEM images near-atomic precision. imide-linkage provided superior thermal (up 530 °C) good chemical stability pH range 3 12. More importantly, exhibited exceptional catalytic activity reusability hydroboration reactions alkynes, turnover frequency (TOF) reached 41734 h-1, is 2-4 orders magnitude greater than reported homogeneous heterogeneous catalysts.

Language: Английский

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New directions on membranes for removal and degradation of emerging pollutants in aqueous systems

Water Research, Journal Year: 2024, Volume and Issue: 251, P. 121111 - 121111

Published: Jan. 6, 2024

Language: Английский

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High performance mixed-dimensional assembled MXene composite membranes for molecular sieving

Journal of Membrane Science, Journal Year: 2024, Volume and Issue: 698, P. 122606 - 122606

Published: Feb. 24, 2024

Language: Английский

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Boosting the Performance of Nanofiltration Membranes in Removing Organic Micropollutants: Trade-Off Effect, Strategy Evaluation, and Prospective Development

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(22), P. 15220 - 15237

Published: Nov. 4, 2022

In view of the high risks brought about by organic micropollutants (OMPs), nanofiltration (NF) processes have been playing a vital role in advanced water and wastewater treatment, owing to membrane performance rejection OMPs, permeation water, passage mineral salts. Though numerous studies devoted evaluating technically enhancing removing various trade-off effect between permeance water/OMP selectivity for state-of-the-art membranes remains far from being understood. Knowledge this is significant comparing guiding development works toward cost-efficient OMP removal. work, we comprehensively assessed 88 NF membranes, commercialized or newly developed, based on their data published literature. The effectiveness underlying mechanisms modification methods tailoring properties turn mainstream polyamide (PA) thin-film composite (TFC) were quantitatively analyzed. was demonstrated abundant both experimental measurements machine learning-based prediction. On basis, advancement novel benchmarked upper-bound revealed commercial lab-made PA membranes. We also potentials current selectively separating OMPs inorganic salts identified future research perspectives achieve further enhancement removal salt/OMP

Language: Английский

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Covalent Organic Frameworks: The Rising‐Star Platforms for the Design of CO₂ Separation Membranes

Small, Journal Year: 2023, Volume and Issue: 19(17)

Published: Jan. 29, 2023

Abstract Membrane‐based carbon dioxide (CO 2 ) capture and separation technologies have aroused great interest in industry academia due to their potential combat current global warming, reduce energy consumption chemical of raw materials, achieve neutrality. The emerging covalent organic frameworks (COFs) composed linkers via reversible bonds are a class porous crystalline polymers with regular extended structures. inherent structure customizable give COFs high permanent porosity, short transport channel, tunable functionality, excellent stability, thereby enabling them rising‐star alternatives for developing advanced CO membranes. Therefore, the promising research areas ranging from development COF membranes applications emerged. Herein, this review first introduces main advantages as state‐of‐the‐art separation, including pore size, modifiable surfaces property, adjustable surface charge, stability. Then, preparation approaches COF‐based systematically summarized, situ growth, layer‐by‐layer stacking, blending, interface engineering. Subsequently, key advances separating various mixed gases, such /CH 4 , /H /N /He, comprehensively discussed. Finally, issues further expectations field proposed.

Language: Английский

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Constructing reduced porous graphene oxide for tailoring mass-transfer channels in ultrathin MXene (Ti3C2T ) membranes for efficient dye/salt separation

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 457, P. 141217 - 141217

Published: Dec. 28, 2022

Language: Английский

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MXene‐based Membranes for Drinking Water Production

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(52)

Published: Aug. 24, 2023

The soaring development of industry exacerbates the shortage fresh water, making drinking water production an urgent demand. Membrane techniques feature merits high efficiency, low energy consumption, and easy operation, deemed as most potential technology to purify water. Recently, a new type two-dimensional materials, MXenes transition metal carbides or nitrides in shape nanosheets, have attracted enormous interest purification due their extraordinary properties such adjustable hydrophilicity, processibility, antifouling resistance, mechanical strength, light-to-heat transformation capability. In pioneering studies, MXene-based membranes been evaluated past decade for including separation bacteria, dyes, salts, heavy metals. This review focuses on recent advancement production. A brief introduction is given first, followed by descriptions unique properties. Then, preparation methods MXene are summarized. various applications treatment corresponding mechanisms discussed detail. Finally, challenges prospects presented with hope provide insightful guidance future design fabrication high-performance membranes.

Language: Английский

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Guanidinium-based covalent organic framework membrane for single-acid recovery

Science Advances, Journal Year: 2023, Volume and Issue: 9(25)

Published: June 21, 2023

Acids are extensively used in contemporary industries. However, time-consuming and environmentally unfriendly processes hinder single-acid recovery from wastes containing various ionic species. Although membrane technology can overcome these challenges by efficiently extracting analytes of interest, the associated typically exhibit inadequate ion-specific selectivity. In this regard, we rationally designed a with uniform angstrom-sized pore channels built-in charge-assisted hydrogen bond donors that preferentially conducted HCl while exhibiting negligible conductance for other compounds. The selectivity originates size-screening ability between protons hydrated cations. donor enables screening acids exerting host-guest interactions to varying extents, thus acting as an anion filter. resulting exhibited exceptional permeation over cations Cl- SO42- HnPO4(3-n)- selectivities up 4334 183, respectively, demonstrating prospects extraction waste streams. These findings will aid designing advanced multifunctional membranes sophisticated separation.

Language: Английский

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Functional MXenes: Progress and Perspectives on Synthetic Strategies and Structure–Property Interplay for Next‐Generation Technologies

Small, Journal Year: 2023, Volume and Issue: 20(4)

Published: Sept. 20, 2023

Abstract MXenes are a class of 2D materials that include layered transition metal carbides, nitrides, and carbonitrides. Since their inception in 2011, they have garnered significant attention due to diverse compositions, unique structures, extraordinary properties, such as high specific surface areas excellent electrical conductivity. This versatility has opened up immense potential various fields, catalyzing surge MXene research leading note worthy advancements. review offers an in‐depth overview the evolution over past 5 years, with emphasis on synthetic strategies, structure‐property relationships, technological prospects. A classification scheme for structures based entropy is presented updated summary elemental constituents family provided, documented recent literature. Delving into microscopic structure synthesis routes, intricate relationships explored at nano/micro level dictate macroscopic applications MXenes. Through extensive latest representative works, utilization energy, environmental, electronic, biomedical fields showcased, offering glimpse current bottlenecks, asstability, scalability, device integration. Moreover, pathways advancing toward next‐generation technologies highlighted.

Language: Английский

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Two-dimensional graphene oxide/MXene lamellar membrane cross-linked by urea with adjustable interlayer spacing for efficient dye rejection and ion sieving

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 480, P. 148009 - 148009

Published: Dec. 9, 2023

Language: Английский

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