Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 485, P. 149135 - 149135
Published: Feb. 5, 2024
Language: Английский
Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)
Published: Aug. 28, 2023
Constructing photocatalytically active and stable covalent organic frameworks containing both oxidative reductive reaction centers remain a challenge. In this study, benzotrithiophene-based with spatially separated redox are rationally designed for the photocatalytic production of hydrogen peroxide from water oxygen without sacrificial agents. The triazine-containing framework demonstrates high selectivity H2O2 photogeneration, yield rate 2111 μM h-1 (21.11 μmol 1407 g-1 h-1) solar-to-chemical conversion efficiency 0.296%. Codirectional charge transfer large energetic differences between linkages linkers verified in double donor-acceptor structures periodic frameworks. sites mainly concentrated on electron-acceptor fragments near imine bond, which regulate electron distribution adjacent carbon atoms to optimally reduce Gibbs free energy O2* OOH* intermediates during formation H2O2.
Language: Английский
Citations
233
Journal of Materials Chemistry A, Journal Year: 2023, Volume and Issue: 11(11), P. 5460 - 5475
Published: Jan. 1, 2023
This review discusses the current status and challenges in development of novel iodine capture adsorbents, focusing on adsorption mechanisms evaluation methods.
Language: Английский
Citations
140
Journal of Hazardous Materials, Journal Year: 2023, Volume and Issue: 458, P. 131835 - 131835
Published: June 12, 2023
Language: Английский
Citations
137
Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(4), P. 2544 - 2552
Published: Jan. 20, 2023
Fashioning microporous covalent organic frameworks (COFs) into single crystals with ordered macropores allows for an effective reduction of the mass transfer resistance and maximum preservation their intrinsic properties but remains unexplored. Here, we report first synthesis three-dimensional (3D) macroporous imine-linked 3D COFs (COF-300 COF-303) via a template-assisted modulated strategy. In this strategy, crystallized within sacrificial colloidal crystal template, assembled from monodisperse polystyrene microspheres, underwent aniline-modulated amorphous-to-crystalline transformation to form large interconnected macropores. The effects introduced structure on sorption performances COF-300 were further probed by iodine. Our results indicate that iodine adsorption occurred in micropores not Accordingly, capacity COF was governed micropore accessibility. relatively long diffusion path non-macroporous resulted limited accessibility (48.4%) thus low (1.48 g·g-1). introduction can greatly shorten render all fully accessible (3.15 g·g-1) coincides well theoretical one.
Language: Английский
Citations
124
Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(3), P. 1475 - 1496
Published: Jan. 16, 2023
Multicomponent reactions (MCRs) combine at least three reactants to afford the desired product in a highly atom-economic way and are therefore viewed as efficient one-pot combinatorial synthesis tools allowing one significantly boost molecular complexity diversity. Nowadays, MCRs no longer confined organic have found applications materials chemistry. In particular, can be used prepare covalent frameworks (COFs), which crystalline porous assembled from monomers exhibit broad range of properties applications. This synthetic approach retains advantages small-molecule MCRs, not only strengthening skeletal robustness COFs, but also providing additional driving forces for their crystallization, has been series robust COFs with diverse The present perspective article provides general background discusses types employed COF date, addresses related critical challenges future perspectives inspire MCR-based design new promote further progress this emerging field.
Language: Английский
Citations
115
Advanced Materials, Journal Year: 2023, Volume and Issue: 35(48)
Published: April 24, 2023
Covalent organic frameworks (COFs) are new porous materials constructed by covalent bonds, with the advantages of pre-designable topology, adjustable pore size, and abundant active sites. Many research studies have shown that COFs exhibit great potential in gas adsorption, molecular separation, catalysis, drug delivery, energy storage, etc. However, electrons holes intrinsic COF prone to compounding transport, carrier lifetime is short. The donor-acceptor (D-A) type COFs, which synthesized introducing D A units into backbone, combine separated electron hole migration pathway, tunable band gap optoelectronic properties D-A polymers unique made progress related recent years. Here, synthetic strategies first outlined, including rational design linkages as well functionalization approaches. Then applications catalytic reactions, photothermal therapy, electronic systematically summarized. In final section, current challenges, directions for development presented.
Language: Английский
Citations
109
Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)
Published: Sept. 4, 2023
Adsorbents widely utilized for environmental remediation, water purification, and gas storage have been usually reported to be either porous or crystalline materials. In this contribution, we report the synthesis of two covalent organic superphane cages, that are as nonporous amorphous superadsorbents aqueous iodine adsorption with record-breaking capability selectivity. static system, cages exhibit uptake capacity up 8.41 g g-1 in I2 solution 9.01 I3- (KI/I2) solution, respectively, even presence a large excess competing anions. dynamic flow-through experiment, can reach 3.59 5.79 g-1, respectively. Moreover, these able remove trace media from ppm level (5.0 ppm) down ppb concentration (as low 11 ppb). Based on binding-induced mechanism, such molecular materials prove superior all existing adsorbents. This study open new avenue development state-of-the-art practical uses conceptionally (NAS).
Language: Английский
Citations
99
Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(28), P. 15465 - 15472
Published: July 7, 2023
Developing diverse synthetic routes to prepare various crystalline covalent organic frameworks (COFs) and enrich the family of COFs is very important highly desirable. In this research, we demonstrate that Kröhnke oxidation (originally developed carbonyl compounds) can be employed as an efficient method construct two nitrone-linked (CityU-1 CityU-2) through ingenious design polynitroso-containing precursors well exquisite control polymerization conditions. The formation structure nitrone-based linkage units have been confirmed a mode reaction. as-obtained characterized by Fourier transform infrared X-ray photoelectron spectroscopy, powder diffraction patterns, scanning electron microscopy. Notably, CityU-1 exhibits BET specific surface area 497.9 m2g-1 with I2 capture capacity 3.0 g g-1 at 75 °C. Our research would provide more chances for applications.
Language: Английский
Citations
89
ACS Applied Nano Materials, Journal Year: 2023, Volume and Issue: 6(2), P. 1295 - 1302
Published: Jan. 11, 2023
With the rapid development of nuclear industry, effective treatment radioactive iodine has currently become an urgent but challenging task. Herein, two covalent organic frameworks (COFs), TFBT-1 and TFBT-2, were successfully synthesized for adsorption. Structure analysis revealed that they are both nanoporous materials with one-dimensional channels derived from packing related two-dimensional frameworks. Iodine adsorption experiments demonstrated COF exhibit performance adsorption, a maximum amount upto 3.15 g g–1 2.60 TFBT-2. The results experimental analyses Fourier-transform infrared spectroscopy, X-ray photoelectron Raman spectroscopy clearly their high is attributed to strong interactions between adsorbed uniformly located abundant nitrogen sites in pores materials, which pre-introduced acylamides situ-generated Schiff base imine groups. present work by introducing nitrogen-rich into adsorbents can be achieved.
Language: Английский
Citations
80
Science China Chemistry, Journal Year: 2024, Volume and Issue: 67(11), P. 3515 - 3577
Published: Sept. 26, 2024
Language: Английский
Citations
80