Covalent organic frameworks: an ideal platform for designing ordered materials and advanced applications

Chemical Society Reviews, Год журнала: 2020, Номер 50(1), С. 120 - 242

Опубликована: Дек. 7, 2020

Covalent organic frameworks offer a molecular platform for integrating units into periodically ordered yet extended 2D and 3D polymers to create topologically well-defined polygonal lattices built-in discrete micropores and/or mesopores.

Язык: Английский

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Platinum Single Atoms Anchored on a Covalent Organic Framework: Boosting Active Sites for Photocatalytic Hydrogen Evolution

ACS Catalysis, Год журнала: 2021, Номер 11(21), С. 13266 - 13279

Опубликована: Окт. 18, 2021

It is of great importance to explore and achieve a more effective approach toward the controllable synthesis single-atom-based photocatalysts with high metal content long-term durability. Herein, single-atom platinum (Pt) loading anchored on pore walls two-dimensional β-ketoenamine-linked covalent organic frameworks (TpPa-1-COF) presented. Aided by advanced characterization techniques aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC HAADF-STEM) X-ray absorption fine structure (XAFS) spectroscopy, it has been demonstrated that atomically dispersed Pt formed TpPa-1-COF support through six-coordinated C3N–Pt–Cl2 species. The optimized Pt1@TpPa-1 catalyst exhibits photocatalytic H2 evolution rate 719 μmol g–1 h–1 under visible-light irradiation, actual 0.72 wt %, large turnover frequency (TOF) 19.5 h–1, activity equivalent 3.9 48 times higher than those nanoparticles/TpPa-1 bare TpPa-1, respectively. improved performance for ascribed photogenerated charge separation migration well-dispersed active sites Pt. Moreover, density functional theory (DFT) calculations further reveal role single atoms in enhanced evolution. Overall, this work provides some inspiration designing outstanding stability efficiency using COFs as support.

Язык: Английский

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Porous organic–inorganic hybrid materials for catalysis, energy and environmental applications

Chemical Communications, Год журнала: 2022, Номер 58(21), С. 3429 - 3460

Опубликована: Янв. 1, 2022

In this feature article, we highlight various synthetic strategies for designing organic–inorganic hybrid porous materials, starting from their molecular building blocks, and task-specific applications in energy environmental research.

Язык: Английский

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Highly Efficient Conversion of Propargylic Alcohols and Propargylic Amines with CO₂ Activated by Noble‐Metal‐Free Catalyst Cu₂O@ZIF‐8

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(19)

Опубликована: Янв. 11, 2022

The cyclization reactions of propargylic alcohols and amines with CO2 are important in industrial applications, but it was a great challenge that non-noble-metal catalysts catalyzed both under mild conditions. Herein, the catalyst Cu2 O@ZIF-8 prepared by encapsulating O nanoparticles into robust ZIF-8, can effectively catalyze valuable α-alkylidene cyclic carbonates oxazolidinones turnover numbers (TONs) 12.1 19.6, which be recycled at least five times. mechanisms were further uncovered NMR, FTIR, 13 C isotope-labeling experiments DFT calculations, DBU synergistically activate C≡C bond hydroxy/amino group substrates. Importantly, is first example noble-metal-free simultaneously.

Язык: Английский

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Tumor microenvironment-responsive multifunctional nanoplatform with selective toxicity for MRI-guided photothermal/photodynamic/nitric oxide combined cancer therapy

Chemical Engineering Journal, Год журнала: 2024, Номер 481, С. 148618 - 148618

Опубликована: Янв. 6, 2024

Язык: Английский

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Fabrication of 2D–2D Heterojunction Catalyst with Covalent Organic Framework (COF) and MoS₂ for Highly Efficient Photocatalytic Degradation of Organic Pollutants

Inorganic Chemistry, Год журнала: 2020, Номер 59(10), С. 6942 - 6952

Опубликована: Май 7, 2020

In this work, for the first time, we fabricated a novel covalent organic framework (COF)-based 2D–2D heterojunction composite MoS2/COF by facile hydrothermal method. The results of photocatalytic degradation TC and RhB under simulated solar light irradiation showed that as-prepared exhibited outstanding catalytic efficiency compared with pristine COFs MoS2. significantly enhanced can be ascribed to formation well-matched band position between COF MoS2, which effectively restrain recombination charge carriers increase absorption as well specific surface area. Moreover, layered structure contact area an intimate interface contact, greatly facilitates mobility transfer in interfaces. This study reveals artful integration (COFs) inorganic materials into single hybrid is effective strategy fabricate highly efficient photocatalysts.

Язык: Английский

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Synthesis of silver nanoparticles using Plantago lanceolata extract and assessing their antibacterial and antioxidant activities

Scientific Reports, Год журнала: 2021, Номер 11(1)

Опубликована: Окт. 21, 2021

Abstract Silver nanoparticles (Ag. NPs) have shown a biological activity range, synthesized under different environment-friendly approaches. Ag. NPs were using aqueous crude extract (ACE) isolated from Plantago lanceolata . The ACE and characterized assessed their antioxidant activities. existence of (NPs) was confirmed by color shift, atomic force microscopy (AFM), UV–Vis’s spectroscopy. FT-IR analysis indicated the association biomolecules (phenolic acid flavonoids) to reduce silver (Ag + ) ions. SEM study demonstrated sphere-shaped mean size in range 30 ± 4 nm. EDX spectrum revealed that composed 54.87% Ag with 20 nm as identified TEM. AFM has ended up being exceptionally useful deciding morphological elements distance across scope 23–30 TEM image showed aggregations physical interaction. formation also XPS, DRS BET studies. efficient compared ACE, finally, bacterial growth impaired biogenic NPs. lethal dose (LD 50 against Agrobacterium tumefaciens , Proteus vulgaris Staphylococcus aureus Escherichia coli 45.66%, 139.71%, 332.87%, 45.54%, IC50 (08.02 0.68), (55.78 1.01), (12.34 1.35) (11.68 1.42) respectively, suppressing ACE. capacity, i.e., 2,2-diphenyl-1-picrylhydrazyl (DPPH) assayed. achieved peak capacity 62.43 2.4 16.85 0.4 μg mL −1 standard (69.60 1.1 at 100 IC (369.5 13.42 159.5 10.52 respectively). Finally, P. an excellent source bioactive natural products (NP). Outstanding antioxidant, antibacterial activities been can be used various techniques future research.

Язык: Английский

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Covalent Organic Frameworks: Synthesis, Properties and Applications—An Overview

Polymers, Год журнала: 2021, Номер 13(6), С. 970 - 970

Опубликована: Март 22, 2021

Covalent Organic Frameworks (COFs) are an exciting new class of microporous polymers with unprecedented properties in organic material chemistry. They generally built from rigid, geometrically defined building blocks resulting robust, covalently bonded crystalline networks that extend two or three dimensions. By strategically combining monomers specific structures and properties, synthesized COF materials can be fine-tuned controlled at the atomic level, unparalleled precision on intrapore chemical environment; moreover, unusually high pore accessibility allows for easy post-synthetic wall modification after is synthesized. Overall, COFs combine high, permanent porosity surface area thermal stability, crystallinity customizability, making them ideal candidates a myriad promising solutions vast number scientific fields, widely varying applications such as gas adsorption storage, pollutant removal, degradation separation, advanced filtration, heterogeneous catalysis, sensing, biomedical applications, energy storage production array optoelectronic solutions. This review attempts to give brief insight history, overall strategies techniques rational synthesis functionalization, well glance exponentially growing field research, summarizing their main introducing numerous technological industrial state art noteworthy examples found literature.

Язык: Английский

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Cu-NPs@COF: A potential heterogeneous catalyst for CO2 fixation to produce 2-oxazolidinones as well as benzimidazoles under moderate reaction conditions

Journal of CO2 Utilization, Год журнала: 2020, Номер 40, С. 101180 - 101180

Опубликована: Июнь 5, 2020

Язык: Английский

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Reticular frameworks and their derived materials for CO2 conversion by thermo−catalysis

EnergyChem, Год журнала: 2021, Номер 3(6), С. 100064 - 100064

Опубликована: Окт. 8, 2021

Язык: Английский

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