Enhancing the Crystallinity of Keto‐enamine‐Linked Covalent Organic Frameworks through an in situ Protection‐Deprotection Strategy

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(13)

Published: Feb. 7, 2024

β-Keto-enamine-linked 2D covalent organic frameworks (COFs) have emerged as highly robust materials, showing significant potential for practical applications. However, the exclusive reliance on 1,3,5-triformylphloroglucinol (Tp aldehyde) in design of such COFs often results production non-porous amorphous polymers when combined with certain amine building blocks. Attempts to adjust crystallinity and porosity by a modulator approach are inefficient because Tp aldehyde readily forms stable β-keto-enamine-linked monomers/oligomers various aromatic amines through an irreversible keto-enol tautomerization process. Our research employed unique protection-deprotection strategy enhance squaramide-based COFs. Advanced solid-state NMR studies, including 1D

Language: Английский

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High-sensitive determination of tetracycline antibiotics adsorbed on microplastics in mariculture water using pre-COF/monolith composite-based in-tube solid phase microextraction on-line coupled to HPLC-MS/MS

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 469, P. 133768 - 133768

Published: Feb. 15, 2024

Language: Английский

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Ultralight and Robust Covalent Organic Framework Fiber Aerogels

Small, Journal Year: 2024, Volume and Issue: 20(32)

Published: Feb. 19, 2024

Abstract Shaping covalent organic frameworks (COFs) into macroscopic objects with robust mechanical properties and hierarchically porous structure is of great significance for practical applications but remains formidable challenging. Herein, a general scalable protocol reported to prepare ultralight pure COF fiber aerogels (FAGs), based on the epitaxial growth synergistic assembly (EGSA) strategy. Specifically, intertwined nanofibers (100–200 nm) are grown in situ electrospinning polyacrylonitrile (PAN) microfibers (≈1.7 µm) containing urea‐based linkers, followed by PAN removal via solvent extraction obtain hollow microfibers. The resultant FAGs possess ultralow density (14.1–15.5 mg cm −3 ) hierarchical porosity that features both micro‐, meso‐, macropores. Significantly, unique interconnected composed endows unprecedented properties, which can fully recover at 50% strain be compressed 20 cycles less than 5% stress degradation. Moreover, exhibit excellent capacity absorption (e.g., chloroform uptake >90 g −1 ). This study opens new avenues design fabrication COFs properties.

Language: Английский

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Fabricating Boron‐Functionalized Covalent Organic Framework with Remarkable Potential in Handling Cationic, Anionic, and Gaseous Nuclear Wastes

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(34)

Published: March 27, 2024

Abstract Fabricating efficient adsorbent for the removal of nuclear waste is vital importance from viewpoint both environmental protection and resource reclamation. Published research has yielded several adsorbents; however, these reported materials do not possess a high performance different types waste. In this work, it shown first time synthesis boron‐functionalized covalent organic framework (COF) its ionic borate counterpart. These COFs are found to show large potential handling various wastes, including alkaline wastewater, uranium‐containing I 2 off‐gas. The developed COF record NaOH uptake g −1 , an ultrahigh uranium extraction ability 1.77 capture capacity 9.4 . Moreover, have low cost reusable, thus significant wastes.

Language: Английский

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Fan-shaped polypyrrole(Ppy)-Sb2S3 composite for synergistic capture of iodine vapor via complexation and REDOX reactions

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160096 - 160096

Published: Jan. 1, 2025

Language: Английский

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