Staggered-Stacking Two-Dimensional Covalent Organic Framework Membranes for Molecular and Ionic Sieving

ACS Nano, Journal Year: 2024, Volume and Issue: 18(51), P. 34698 - 34707

Published: Dec. 10, 2024

Two-dimensional covalent organic frameworks (2D COFs), a family of crystalline materials with abundant porous structures offering nanochannels for molecular transport, have enormous potential in the applications separation, energy storage, and catalysis. However, 2D COFs remain limited by relatively large pore sizes (>1 nm) weak interlayer interactions between nanosheets, making it difficult to achieve efficient membranes meet selective sieving requirements water molecules (0.3 hydrated salt ions (>0.7 nm). Here, we report high-performance COF membrane narrowed channels (0.7 × 0.4 nm2) excellent mechanical performance constructed staggered stacking cationic anionic nanosheets selectively ions. The has been improved two times than that single-phase due enhanced nanosheets. stacked exhibit significantly monovalent rejection ratio (up 77.9%) compared (∼49.2%), while maintaining comparable permeability. design provides strategy constructing nanoporous precise ionic sieving.

Language: Английский

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Covalent Organic Framework Membranes with Spatially Aligned Ionic Sites Achieve Record Thermo‐Osmotic Output Power Density

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 31, 2025

Abstract The advancement of nanofluidic membranes is critical for mimicking bioelectrogenic ion‐channel mechanisms and boosting output power density, essential sustainable energy applications. conversion efficiency these devices significantly relies on the ion conductivity permselectivity membranes. Membranes with aligned one‐dimentional (1D) pores, high pore organized dangling ionic groups are theorized to offer superior permeability selectivity, yet configurations remain underexplored. Herein, successful fabrication oriented covalent organic framework (COF) presented. These exhibit precisely cationic anionic sites within their channels, achieved through post‐synthetic modification using click chemistry, which shows conductivity. When incorporated into full‐cell thermo‐osmotic generators, deliver an impressive density 195 W m −‍2 under a 50‐fold salinity gradient (NaCl: 0.01 ‖ 0.5 ) along 35 K temperature differential. This substantially increases 2.41 times 471 −2 when enhanced tenfold, surpassing performance existing similar conditions thus offering promising avenue enhancing in resource utilization.

Language: Английский

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Green and large-scale production of covalent organic framework nanofiltration membranes

Communications Materials, Journal Year: 2025, Volume and Issue: 6(1)

Published: April 1, 2025

Language: Английский

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Nitrogen-Rich Angstrom Channels within Covalent Triazine Framework Membrane Enable Efficient Acid Recovery

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 23, 2025

Membranes tailored for selective H+ transfer are highly demanded in various fields such as acid recovery and proton exchange membranes. Emerging framework materials featuring permanent micropores present more competitive selectivity than traditional polymeric However, it remains challenging to construct angstrom channels precise ion separations. Herein, we demonstrate the modulation of nitrogen-rich within a covalent triazine (CTF) membrane by mix-monomer copolymerization strategy, which one monomer provides defect-free another offers plentiful nitrogen sites. The abundant sites with strong affinity facilitate fast diffusion, their high protonation level solution imparts positive charge, enabling efficient Fe2+ retention via Donnan exclusion. optimized CTF achieves dialysis coefficient 1.5 × 10-3 m/h separation factor 11,242 H+/Fe2+ mixtures. outperforms most reported membranes benefiting from its confined channels. Additionally, robust stability groups guarantees consecutive operation aggressive acidic solutions. This work presents an effective approach modulating transport efficiency through potential applications recovery.

Language: Английский

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Advanced Microporous Framework Membranes for Sustainable Separation

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 24, 2025

Abstract Advancements in membrane‐based separation hinge on the design of materials that transcend conventional limitations. Microporous materials, including metal–organic frameworks (MOFs), covalent–organic (COFs), macrocycles, and porous organic cages (POCs) offer unprecedented control over pore architecture, chemical functionality, transport properties, making them promising candidates for next‐generation membrane technologies. The well‐defined tunable micropores provide a pathway to directly address permeability‐selectivity trade‐off inherent polymer membranes. Here, this review explores latest advancements these four representative microporous membranes, emphasizing their breakthroughs hydrocarbon separation, liquid‐phase molecular sieving, ion‐selective transport, particularly focusing structure‐performance relationships. While tailored structures enable exceptional performance, practical adoption requires overcoming hurdles scalability, durability, compatibility with industrial processes. By offering insights into structure optimization innovative strategies, provides roadmap advancing membranes from laboratory innovation real‐world implementation, ultimately supporting global sustainability goals through energy‐efficient

Language: Английский

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