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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Highly Enhancing CO₂ Photoreduction by Metallization of an Imidazole‐linked Robust Covalent Organic Framework

Small, Journal Year: 2023, Volume and Issue: 19(44)

Published: June 30, 2023

Converting CO2 into value-added chemicals to solve the issues caused by carbon emission is promising but challenging. Herein, embedding metal ions (Co2+ , Ni2+ Cu2+ and Zn2+ ) an imidazole-linked robust photosensitive covalent organic framework (PyPor-COF), effective photocatalysts for conversion are rationally designed constructed. Characterizations display that all of metallized PyPor-COFs (M-PyPor-COFs) remarkably high enhancement in their photochemical properties. Photocatalysis reactions reveal Co-metallized PyPor-COF (Co-PyPor-COF) achieves a CO production rate as up 9645 µmol g-1 h-1 with selectivity 96.7% under light irradiation, which more than 45 times higher metal-free PyPor-COF, while Ni-metallized (Ni-PyPor-COF) can further tandem catalyze generated CH4 463.2 . Experimental analyses theory calculations remarkable performance on photoreduction should be attributed incorporated sites COF skeleton, promotes adsorption activation desorption even reduces reaction energy barrier formation different intermediates. This work demonstrates metallizing photoactive COFs, achieved.

Language: Английский

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Green synthesis of bifunctional phthalocyanine-porphyrin COFs in water for efficient electrocatalytic CO2 reduction coupled with methanol oxidation

National Science Review, Journal Year: 2023, Volume and Issue: 10(11)

Published: Sept. 2, 2023

Electrocatalytic CO2 reduction (ECR) coupled with organic oxidation is a promising strategy to produce high value-added chemicals and improve energy efficiency. However, achieving the efficient redox coupling reaction still challenging due lack of suitable electrocatalysts. Herein, we designed two bifunctional polyimides-linked covalent frameworks (PI-COFs) through assembling phthalocyanine (Pc) porphyrin (Por) by non-toxic hydrothermal methods in pure water realize above catalytic reactions. Due conductivity well-defined active sites different chemical environments, NiPc-NiPor COF performs ECR methanol (MOR) (Faradaic efficiency CO (FECO) = 98.12%, partial current densities (jCO) 6.14 mA cm-2 for ECR, FEHCOOH 93.75%, jHCOOH 5.81 MOR at low cell voltage (2.1 V) remarkable long-term stability). Furthermore, experimental evidences density functional theory (DFT) calculations demonstrate that process mainly conducts on NiPc unit assistance NiPor, meanwhile, prefers NiPor conjugating NiPc. The units collaboratively promote oxidation-reduction reaction. For first time, this work achieves rational design COFs heterogeneous catalysis, which opens new area crystalline material catalysts.

Language: Английский

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Recent advances in covalent organic frameworks (COFs) for wound healing and antimicrobial applications

RSC Advances, Journal Year: 2023, Volume and Issue: 13(12), P. 8136 - 8152

Published: Jan. 1, 2023

Covalent organic frameworks (COFs) are crystal-like structures such as cartography buildings prepared from appropriately pre-designed construction block precursors and deployed for wound healing purposes.

Language: Английский

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Exploring metal-free ionic covalent organic framework nanosheets as efficient OER electrocatalysts via cationic-π interactions

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 478, P. 147403 - 147403

Published: Nov. 18, 2023

Language: Английский

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