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, Год журнала: 2024, Номер 469, С. 133768 - 133768

Опубликована: Фев. 15, 2024

Язык: Английский

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

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(13)

Опубликована: Фев. 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

Язык: Английский

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Ultralight and Robust Covalent Organic Framework Fiber Aerogels

Small, Год журнала: 2024, Номер 20(32)

Опубликована: Фев. 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.

Язык: Английский

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Theory-driven design of phosphazene-based porous polymer beads for enhanced iodine adsorption

Separation and Purification Technology, Год журнала: 2024, Номер 345, С. 127321 - 127321

Опубликована: Апрель 1, 2024

Язык: Английский

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A mixed polynuclear Clusters-Based Y-MOF with an unprecedented (12, 12, 18)-C Topology: Highly efficient Propylene/Ethylene separation and iodine adsorption

Chemical Engineering Journal, Год журнала: 2024, Номер 498, С. 155176 - 155176

Опубликована: Авг. 24, 2024

Язык: Английский

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