The heavy lanthanide of Thulium(III) separation and recovery using specific ligand-based facial composite adsorbent

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2023, Volume and Issue: 667, P. 131415 - 131415

Published: April 7, 2023

Language: Английский

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Tuning Local Charge Distribution in Multicomponent Covalent Organic Frameworks for Dramatically Enhanced Photocatalytic Uranium Extraction

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

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Advances of MOFs and COFs for photocatalytic CO2 reduction, H2 evolution and organic redox transformations

Coordination Chemistry Reviews, Journal Year: 2023, Volume and Issue: 490, P. 215210 - 215210

Published: May 21, 2023

Language: Английский

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COF/In₂S₃ S‐Scheme Photocatalyst with Enhanced Light Absorption and H₂O₂‐Production Activity and fs‐TA Investigation

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(24)

Published: Feb. 27, 2024

Photocatalytic hydrogen peroxide (H

Language: Английский

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Confining Ti-oxo clusters in covalent organic framework micropores for photocatalytic reduction of the dominant uranium species in seawater

Chem, Journal Year: 2023, Volume and Issue: 9(11), P. 3172 - 3184

Published: July 11, 2023

Language: Английский

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Cyano‐Functionalized Graphitic Carbon Nitride with Adsorption and Photoreduction Isosite Achieving Efficient Uranium Extraction from Seawater

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(19)

Published: Jan. 8, 2024

Abstract Photocatalytic uranium extraction from seawater is an ideal strategy to obtain resources. Herein, the cyano‐functionalized graphitic carbon nitride (g‐C 3 N 4 ‐CN) with isosite structure of adsorption and photoreduction for U(VI) successfully prepared achieve efficient photocatalytic seawater. As key structure, cyano group not only dramatically promotes separation photogenerated charges g‐C ‐CN enriched electrons around it, but also greatly improves capacity selectivity over by complexing U(VI). Therefore, exhibits stable reduction performance, a saturated 2644.3 mg g −1 , significantly higher than most reported ‐based photocatalysts. Moreover, it performs well in solar light‐driven actual Briefly, this work illustrates importance constructing improving performance.

Language: Английский

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Biochar-based materials in environmental pollutant elimination, H2 production and CO2 capture applications

Biochar, Journal Year: 2023, Volume and Issue: 5(1)

Published: July 20, 2023

Abstract Biochar and biochar-based materials have been studied extensively in multidisciplinary areas because of their outstanding physicochemical properties. In this review article, biochar the removal environmental pollutants, hydrogen generation carbon dioxide capture were summarized compared. The interaction mechanisms discussed from experimental results characterization analysis. high porous structures, active surface sites, (co)doping single metals/nonmetals, incorporation metal oxides or other improved activity applications. However, there are still some challenges such as: (1) fact that H 2 with selectivity produced syngas to meet real application requirement industrial is main challenge production; (2) selective CO stability, adsorption capacity recyclability at low-cost should be considered focused on; (3) sorption-(photo)degradation organic chemicals; (4) sorption-reduction-extraction/solidification metals/radionuclides efficient methods for elimination pollutants. end, perspectives, possible techniques materials’ future described. Graphical

Language: Английский

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Π‐Skeleton Tailoring of Olefin‐Linked Covalent Organic Frameworks Achieving Low Exciton Binding Energy for Photo‐Enhanced Uranium Extraction from Seawater

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(1)

Published: Sept. 21, 2023

Abstract Adsorption‐photocatalysis technology based on covalent organic frameworks (COFs) offers an alternative method for advancing the field of uranium extraction from seawater. When determining photocatalytic activity COFs, binding energy excitons ( E b ) functions is decisive factor. Nevertheless, majority reported COFs have a large , which seriously restricts their application in photocatalysis. Using practical π‐skeleton engineering strategy, current study synthesizes three donor‐acceptor olefin‐linked containing amidoxime units effort to minimize . Theoretical and experimental results reveal that construction planar continuous π ‐electron delocalization channels can significantly reduce promote separation electron‐hole pairs, thereby enhancing activities. Moreover, TTh‐COF‐AO with ‐skeleton donor reduced, exhibits substantially smaller (38.4 meV). Under visible light irradiation, high photo‐enhanced capacity 10.24 mg g −1 achieved natural seawater without addition sacrificial reagents, superior been date. This study, therefore, paves way development tailored, efficient photocatalysts

Language: Английский

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Synthesis of propenone-linked covalent organic frameworks via Claisen-Schmidt reaction for photocatalytic removal of uranium

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

Published: July 21, 2023

The type of reactions and the availability monomers for synthesis sp2-c linked covalent organic frameworks (COFs) are considerably limited by irreversibility C=C bond. Herein, inspired Claisen-Schmidt condensation reaction, two propenone-linked (C=C-C=O) COFs (named Py-DAB PyN-DAB) developed based on base-catalyzed nucleophilic addition reaction ketone-activated α-H with aromatic aldehydes. introduction propenone structure endows high crystallinity, excellent physicochemical stability, intriguing optoelectronic properties. Benefitting from rational design skeleton, PyN-DAB applied to extraction radionuclide uranium. In particular, shows removal rates (>98%) in four uranium mine wastewater samples. We highlight that such a general strategy can provide valuable avenue toward various functional porous crystalline materials.

Language: Английский

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Construction of Crystalline Nitrone-Linked Covalent Organic Frameworks Via Kröhnke Oxidation

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

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