Pore-in-Pore Engineering in a Covalent Organic Framework Membrane for Gas Separation DOI Creative Commons
Hongwei Fan, Haoran Wang,

Manhua Peng

et al.

ACS Nano, Journal Year: 2023, Volume and Issue: 17(8), P. 7584 - 7594

Published: April 7, 2023

Covalent organic framework (COF) membranes have emerged as a promising candidate for energy-efficient separations, but the angstrom-precision control of channel size in subnanometer region remains challenge that has so far restricted their potential gas separation. Herein, we report an ultramicropore-in-nanopore concept engineering matreshka-like pore-channels inside COF membrane. In this concept, α-cyclodextrin (α-CD) is situ encapsulated during interfacial polymerization which presumably results linear assembly (LA) α-CDs 1D nanochannels COF. The LA-α-CD-in-TpPa-1 membrane shows high H2 permeance (∼3000 GPU) together with enhanced selectivity (>30) over CO2 and CH4 due to formation fast selective H2-transport pathways. overall performance H2/CO2 H2/CH4 separation transcends Robeson upper bounds ranks among most powerful H2-selective membranes. versatility strategy demonstrated by synthesizing different types LA-α-CD-in-COF

Language: Английский

Orderly Porous Covalent Organic Frameworks-based Materials: Superior Adsorbents for Pollutants Removal from Aqueous Solutions DOI Creative Commons
Xiaolu Liu,

Hongwei Pang,

Xuewei Liu

et al.

The Innovation, Journal Year: 2021, Volume and Issue: 2(1), P. 100076 - 100076

Published: Jan. 10, 2021

Covalent organic frameworks (COFs) are a new type of crystalline porous polymers known for chemical stability, excellent structural regularity, robust framework, and inherent porosity, making them promising materials capturing various types pollutants from aqueous solutions. This review thoroughly presents the recent progress advances COFs COF-based as superior adsorbents efficient removal toxic heavy metal ions, radionuclides, pollutants. Information about interaction mechanisms between summarized macroscopic microscopic standpoints, including batch experiments, theoretical calculations, advanced spectroscopy analysis. The adsorption properties assessed compared with other widely used adsorbents. Several commonly strategies to enhance materials' performance relationship property sorption ability also discussed. Finally, summary perspective on opportunities challenges proposed provide some inspiring information designing fabricating environmental pollution management.

Language: Английский

Citations

541
Updates on the Roadmap for Photocatalysis DOI Creative Commons
Michele Melchionna, Paolo Fornasiero

ACS Catalysis, Journal Year: 2020, Volume and Issue: 10(10), P. 5493 - 5501

Published: April 14, 2020

ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTUpdates on the Roadmap for PhotocatalysisMichele MelchionnaMichele MelchionnaChemistry Department, INSTM and ICCOM-CNR Trieste Research Unit, University of Trieste, Via L. Giorgieri 1, 34127, ItalyMore by Michele Melchionnahttp://orcid.org/0000-0001-9813-9753 Paolo Fornasiero*Paolo FornasieroChemistry Italy*Email P.F.: [email protected]More Fornasierohttp://orcid.org/0000-0003-1082-9157Cite this: ACS Catal. 2020, 10, 5493–5501Publication Date (Web):April 14, 2020Publication History Received13 March 2020Published online14 April inissue 15 May 2020https://doi.org/10.1021/acscatal.0c01204Copyright © 2020 American Chemical SocietyRIGHTS & PERMISSIONSACS AuthorChoiceCC: Creative CommonsBY: Credit must be given to creatorArticle Views16419Altmetric-Citations196LEARN ABOUT THESE METRICSArticle Views are COUNTER-compliant sum full text article downloads since November 2008 (both PDF HTML) across all institutions individuals. These metrics regularly updated reflect usage leading up last few days.Citations number other articles citing this article, calculated Crossref daily. Find more information about citation counts.The Altmetric Attention Score is a quantitative measure attention that research has received online. Clicking donut icon will load page at altmetric.com with additional details score social media presence article. how calculated. Share Add toView InAdd Full Text ReferenceAdd Description ExportRISCitationCitation abstractCitation referencesMore Options onFacebookTwitterWechatLinked InReddit (4 MB) Get e-AlertsSUBJECTS:Catalysts,Materials,Metals,Photocatalysis,Photocatalysts e-Alerts

Language: Английский

Citations

393
Tuning excited state electronic structure and charge transport in covalent organic frameworks for enhanced photocatalytic performance DOI Creative Commons
Zhongshan Chen, Jingyi Wang, Mengjie Hao

et al.

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Feb. 27, 2023

Covalent organic frameworks (COFs) represent an emerging class of photocatalysts. However, their complicated structures lead to indeterminacy about photocatalytic active sites and reaction mechanisms. Herein, we use reticular chemistry construct a family isoreticular crystalline hydrazide-based COF photocatalysts, with the optoelectronic properties local pore characteristics COFs modulated using different linkers. The excited state electronic distribution transport pathways in are probed host experimental methods theoretical calculations at molecular level. One our developed (denoted as COF-4) exhibits remarkable electron utilization efficiency charge transfer properties, achieving record-high uranium extraction performance ~6.84 mg/g/day natural seawater among all techniques reported so far. This study brings new understanding operation COF-based guiding design improved photocatalysts for many applications.

Language: Английский

Citations

283
Vinylene‐Linked Covalent Organic Frameworks (COFs) with Symmetry‐Tuned Polarity and Photocatalytic Activity DOI

Junsong Xu,

Can Yang, Shuai Bi

et al.

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 59(52), P. 23845 - 23853

Published: Sept. 21, 2020

Abstract The polarity of a semiconducting molecule affects its intrinsic photophysical properties, which can be tuned by varying the molecular geometry. Herein, we developed D 3 h ‐symmetric tricyanomesitylene as new monomer could reticulated into vinylene‐linked covalent organic framework (g‐C 54 N 6 ‐COF) via Knoevenagel condensation with another 2,4,6‐tris(4′‐formyl‐biphenyl‐4‐yl)‐1,3,5‐triazine. Replacing C 2 v 3,5‐dicyano‐2,4,6‐trimethylpyridine gave less‐symmetric COF 52 ‐COF). octupolar conjugated characters g‐C ‐COF were reflected in scarce solvatochromic effects either ground or excited states, and endowed it more promising behavior compared ‐COF, such enhanced light‐harvesting excellent photo‐induced charge generation separation. Along matched energy level, enabled two‐half reactions photocatalytic water splitting an average O evolution rate 51.0 μmol −1 g H 2518.9 . Such values are among highest state‐of‐the‐art photocatalysts.

Language: Английский

Citations

259
Metalated covalent organic frameworks: from synthetic strategies to diverse applications DOI
Qun Guan, Lele Zhou, Yu‐Bin Dong

et al.

Chemical Society Reviews, Journal Year: 2022, Volume and Issue: 51(15), P. 6307 - 6416

Published: Jan. 1, 2022

This review highlights the recent advances of metalated covalent organic frameworks, including synthetic strategies and applications, discusses current challenges future directions.

Language: Английский

Citations

215
Tuning Local Charge Distribution in Multicomponent Covalent Organic Frameworks for Dramatically Enhanced Photocatalytic Uranium Extraction DOI
Hui Yang, Mengjie Hao,

Yinghui Xie

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(30)

Published: April 29, 2023

Optimizing the electronic structure of covalent organic framework (COF) photocatalysts is essential for maximizing photocatalytic activity. Herein, we report an isoreticular family multivariate COFs containing chromenoquinoline rings in COF and electron-donating or withdrawing groups pores. Intramolecular donor-acceptor (D-A) interactions allowed tuning local charge distributions carrier separation under visible light irradiation, resulting enhanced performance. By optimizing optoelectronic properties COFs, a uranium extraction efficiency 8.02 mg/g/day was achieved using nitro-functionalized multicomponent natural seawater, exceeding performance all reported to date. Results demonstrate effective design strategy towards high-activity with intramolecular D-A structures not easily accessible traditional synthetic approaches.

Language: Английский

Citations

196
Covalent-Organic-Framework-Based Composite Materials DOI Creative Commons
Yu Liu, Weiqiang Zhou, Wei Liang Teo

et al.

Chem, Journal Year: 2020, Volume and Issue: 6(12), P. 3172 - 3202

Published: Sept. 18, 2020

Language: Английский

Citations

188
Crystalline C—C and C═C Bond-Linked Chiral Covalent Organic Frameworks DOI
Yuan Chen,

Shiguo Fu,

Kuiwei Yang

et al.

Journal of the American Chemical Society, Journal Year: 2020, Volume and Issue: 143(1), P. 369 - 381

Published: Dec. 24, 2020

While crystalline covalent organic frameworks (COFs) linked by C–C bonds are highly desired in synthetic chemistry, it remains a formidable challenge to synthesize. Efforts generate single COFs via de novo synthesis usually afford amorphous structures rather than phases. We demonstrate here that bond-based can be prepared direct reduction of C═C bond-linked crystal-to-crystal transformation. By Knoevenagel polycondensation chiral tetrabenzaldehyde dibinaphthyl-22-crown-6 with 1,4-phenylenediacetonitrile or 4,4′-biphenyldiacetonitrile, two olefin-linked 2D layered tetragonal structure prepared. Reduction olefin linkages the as-prepared CCOFs produces bond frameworks, which retains high crystallinity and porosity as well chemical stability both strong acids bases. The quantitative is confirmed Fourier transform infrared cross-polarization magic angle spinning 13C NMR spectroscopy. Compared pristine structures, reduced display blue-shifted emission enhanced quantum yields fluorescence lifetimes, while parent exhibit higher enantioselectivity analogs when used fluorescent sensors detect amino alcohols supramolecular interactions built-in crown ether moieties. This work provides an attractive strategy for making chemically stable functionalized new otherwise hard produce.

Language: Английский

Citations

159
2D Covalent Organic Frameworks: From Synthetic Strategies to Advanced Optical‐Electrical‐Magnetic Functionalities DOI

Congyong Wang,

Zhicheng Zhang, Yating Zhu

et al.

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(17)

Published: Jan. 20, 2022

Abstract Covalent organic frameworks (COFs), an emerging class of crystalline polymers with highly oriented structures and permanent porosity, can adopt 2D or 3D architectures depending on the different topological diagrams monomers. Notably, COFs have particularly gained much attention due to extraordinary merits their extended in‐plane π‐conjugation topologically ordered columnar π‐arrays. These properties together high crystallinity, large surface area, tunable porosity distinguish as ideal candidate for fabrication functional materials. Herein, this review surveys recent research advances in special emphasis preparation COF powders, single crystals, thin films, well advanced optical, electrical, magnetic functionalities. Some challenging issues potential outlook are also provided promoting development terms structure, synthesis,

Language: Английский

Citations

155
Covalent organic frameworks for direct photosynthesis of hydrogen peroxide from water, air and sunlight DOI Creative Commons

Fuyang Liu,

Peng Zhou,

Yanghui Hou

et al.

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: July 19, 2023

Solar-driven photosynthesis is a sustainable process for the production of hydrogen peroxide, efficiency which plagued by side reactions. Metal-free covalent organic frameworks (COFs) that can form suitable intermediates and inhibit reactions show great promise to photo-synthesize H2O2. However, insufficient formation separation/transfer photogenerated charges in such materials restricts H2O2 production. Herein, we provide strategy design donor-acceptor COFs greatly boost photosynthesis. We demonstrate optimal intramolecular polarity COFs, achieved using amounts phenyl groups as electron donors, maximize free charge generation, leads high yield rates (605 μmol g-1 h-1) from water, oxygen visible light without sacrificial agents. Combining in-situ characterization with computational calculations, describe how triazine N-sites N 2p states play crucial role H2O activation selective oxidation into further experimentally be efficiently produced tap, river or sea water natural sunlight air decontamination.

Language: Английский

Citations

155