Noncovalent Complex Modulated Fabrication of COF Membrane for Organic Solvent Nanofiltration

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 9, 2025

Covalent organic framework (COF) has been recognized as a disruptive material for fabricating molecular sieve membranes. Acquiring crystalline and defect-free COF membranes directly on polymeric substrates is important practical applications yet highly challenging. In this study, noncovalent complex (NCX) modulated fabrication of membrane hydrolyzed polyacrylonitrile (HPAN) substrate via counter diffusion proposed. The triaminoguanidine chloride-phytic acid (Tg-PA NCX) uniformly introduced onto the HPAN substrate, transferring into an ideal seeding layer catalytic platform nucleation growth. Enhanced Tg monomer concentration derived from NCX enhance its near surface observed, facilitating heterogeneous fabrication. addition, PA in acted catalyst, promoting growth afterward. resulting TgTb/NCX/HPAN shows with high crystallinity. Also, it displays over 90% rejection to various dyes rates (e.g., Evans blue, Methyl Congo red, Amido Black) solvent permeation solvents ethanol: 57.9 ± 2.1 L m-2h-1 bar-1, n-hexane: 215.0 2.7 bar-1). This work holds great potential technology high-performance

Language: Английский

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Bioinspired Chloride-Assisted Protein Channels: Enhancing Proton Transport for Sustainable Energy Harvesting from Acidic Wastewater

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Highly efficient proton transfer in biological processes has driven the pursuit of synthetic analogs; however, replicating high permeance natural systems remains a significant challenge. Herein, inspired by function ClC-ec1 protein, we report design Cl--assisted transport channels within hybrid membrane composed covalent organic frameworks (COFs) integrated with aramid nanofibers (ANFs). By leveraging buffer layer-mediated interfacial polymerization and flocculation behavior ANF aqueous environments, establish robust hydrogen-bonding interactions between COFs ANFs. The hydride material enables Cl- binding, significantly accelerating manner similar to that protein channel. In presence small concentration ions (0.1% concentration), permeation rate is enhanced approximately 3 times, reaching 9.8 mol m-2 h-2. Notably, facilitates sustainable osmotic power generation from acidic wastewater, delivering an output density 434.8 W m-2. Theoretical calculations revealed preferentially binds Cl-, promoting hopping lowering energy barrier for transport. This study establishes new paradigm bioinspired ion-assisted transport, presenting approach harvesting wastewater.

Language: Английский

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Amphoteric Metal Ion‐Coordinated Chitosan Membranes for Efficient Hydroxide Ion Transport

Chemistry - An Asian Journal, Journal Year: 2025, Volume and Issue: unknown

Published: April 30, 2025

Hydroxide exchange membranes (HEMs) have attracted extensive attention in energy-related fields, such as fuel cells and water electrolysis, primarily due to their suitability for alkaline environments. However, the practical application of is hindered significantly by limited conductivity. In this study, a series amphoteric metal ion-coordinated chitosan (CTS-AM) with enhanced hydroxide ion conductivity are reported. The CTS-AM prepared using simple soaking-drying method, exhibiting excellent mechanical strength thermal stability strong coordination bonds between ions chains. To best our knowledge, Zn2+ coordinated membrane achieved highest-ever reported 82.0 ± 5.4 mS cm-1 at 25 °C 100% RH, value increasing 301.0 6.7 operating temperature (80 °C) RH. Through combined structural analysis theoretical calculations, we propose that formation nanochannels lowered barrier electron transfer responsible high conductivities membranes. This study presents viable approach design fabrication high-performance HEMs energy storage devices other applications.

Language: Английский

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Rotaxane Mediated Covalent Organic Framework Membranes for Efficient Desalination

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

Published: March 17, 2025

Abstract Covalent organic framework (COF) membranes with adjustable and periodic channels show great potential in desalination. However, low crystallinity inherent large pore size of COF seriously hinder effective interception for salt. Herein, a rotaxane‐mediated interfacial polymerization (RMIP) strategy is proposed via incorporating pseudorotaxane linkers (macrocyclic molecule diamine host‐guest complexes) into the reaction, obtaining rotaxane‐based (RCOF) high sub‐nanochannels. The pseudorotaxanes slow down diffusion diamines liquid phase, which regulates Schiff base reaction rate at oil‐water interface balances polymerization‐crystallization process, facilitating crystalline, tight, defect‐free membrane formation. Moreover, formed rotaxanes increase interlayer steric hindrance induce RCOF subunits ABC stacking, narrowing membranes. During pervaporation, optimal shows permeation flux 180.2 kg m −2 h −1 outstanding NaCl rejection 99.9%. Meanwhile, it exhibits stable desalination antifouling ability long‐term operation. This study provides new method accurate construction significance efficient separation.

Language: Английский

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Molecular-level side chain engineering on comb-shaped sulfonated poly(ether ether ketone) equilibrium-modified atmosphere packaging membrane

Journal of Membrane Science, Journal Year: 2025, Volume and Issue: unknown, P. 123982 - 123982

Published: March 1, 2025

Language: Английский

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