Light-driven in-situ synthesis of nano-sulfur and graphene oxide composites for efficient removal of heavy metal ions

Journal of Hazardous Materials, Год журнала: 2025, Номер 487, С. 137079 - 137079

Опубликована: Янв. 2, 2025

Язык: Английский

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Linkage Microenvironment Modulation in Triazine‐Based Covalent Organic Frameworks for Enhanced Photocatalytic Hydrogen Peroxide Production

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 26, 2025

Abstract Covalent organic frameworks (COFs), known for the precise tunability of molecular structures, hold significant promise photocatalytic hydrogen peroxide (H 2 O ) production. Herein, by systematically altering quinoline (QN) linkages in triazine (TA)‐based COFs via multi‐component reactions, six R‐QN‐TA‐COFs are synthesized with identical skeletons but different substituents. The fine‐tuning optoelectronic properties and local microenvironment is allowed, thereby optimizing charge separation improving interactions dissolved oxygen. Consequently, MeO‐QN‐TA‐COF customized to achieve an impressive rate H production up 7384 µmol g⁻ 1 h⁻ under air atmosphere water without any sacrificial agents, surpassing most reported COF photocatalysts. Its high stability demonstrated through five consecutive recycling experiments characterization recovered COF. reaction mechanism further investigated using a suite quenching experiments, situ spectroscopic analysis, theoretical calculations. enhanced over 2e⁻ oxygen reduction oxidation pathways. Overall, crucial role linkage modulation design solar‐driven effective

Язык: Английский

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A Dynamic Covalent Organic Framework with Entangled 2D Layers

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Фев. 14, 2025

Dynamic covalent organic frameworks (COFs) represent an emerging class of porous materials with inherent structural flexibility. However, due to the challenges in their synthesis and characterization, research on dynamic COFs remains at early stage requires further exploration. Herein, we report designed a novel COF entangled 2D layers that exhibits interesting behavior response vapor exposure. By employing continuous rotation electron diffraction technique, precisely resolved crystal structures before after adsorption. Structural analysis revealed vapor-induced conformational changes, such as anthracene unit rotation, triggered layer adjustments reduced entanglement angles, leading significant pore structure alterations. This study not only introduces new but also provides foundation for rational design flexibility diverse applications.

Язык: Английский

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Recent Advances in Room-Temperature Synthesis of Covalent Organic Frameworks

Chemical Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Room-temperature synthesis bridges the gap between chemistry and practical application of COFs. This review provides an overview characterization technologies COF growth mechanisms recent room-temperature synthetic strategies.

Язык: Английский

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Covalent organic frameworks embedding single cadmium sites for efficient carboxylative cyclization of CO₂with propargylic amines

Green Chemistry, Год журнала: 2023, Номер 25(14), С. 5557 - 5565

Опубликована: Янв. 1, 2023

Single cadmium sites on covalent organic frameworks promote adsorption and activation of CO 2 to efficiently catalyze cyclization propargylic amines.

Язык: Английский

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