Molecular-level regulation strategies for charge separation in conjugated polymer/polymeric carbon nitride heterojunction enabling efficient uranium photoreduction

Journal of Solid State Chemistry, Journal Year: 2025, Volume and Issue: 344, P. 125173 - 125173

Published: Jan. 4, 2025

Language: Английский

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Construction of a Hierarchical Core–Shell Z-Scheme Two-Dimensioanl/Two-Dimensional ZnIn₂S₄@TpBpy Heterostructure for Photocatalytic Reduction of U(VI)

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 6, 2025

The essential nature of the photocatalytic process is charge transfer. To optimize spatial separation photogenerated electron–hole (e–-h+) pairs for high-performance catalytic efficiency, in this work, we have successfully prepared hierarchical core–shell two-dimensional (2D)/2D ZnIn2S4@TpBpy (ZIS@TpBpy) with well-matched Z-scheme interfacial transfer channels uranium (U(VI)) photoreduction. electron configuration was confirmed by internal electric field (IEF) formation analysis, XPS characterization, and DMPO spin-trapping EPR spectroscopy. With large specific surface area abundant active sites, ZIS@TpBpy composite achieved a U(VI) extraction rate 94.08%. In addition, removal constant (0.0137 min–1) 2.05 4.28 times higher than those TpBpy (0.0067 ZnIn2S4 (0.0032 min–1), respectively. First, combination organic inorganic components expanded range visible light absorption utilization. Afterward, under visible-light irradiation, more e–-h+ dissociated migrated to driven IEF heterostructure. Simultaneously, synergistic effect between polarization potential generated sites (N O atoms) framework further accelerated depletion translocation pairs, which significantly improved efficiency reduction U(VI).

Language: Английский

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Morphology Effect of FeWO₄ Boosting Efficiency of Photocatalytic Uranium Extraction under Visible Light and Mechanism Investigation

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: March 14, 2025

Wolframite (FeWO4) is a type of polyoxometalate known for its high chemical stability and electronic properties, which makes it an excellent photocatalyst. While FeWO4 has been widely utilized in the domain organic catalysis, there are currently no documented reports regarding use degradation U(VI). In this study, effect changing microscopic morphology catalyst to enhance photocatalytic activity was explored. We effectively adjusted microstructure crystallinity by varying hydrothermal synthesis temperature, subsequently analyzed detail using synchrotron radiation theoretical calculations. Additionally, rate U(VI) nuclear wastewater reached 98.8% samples synthesized at 200 °C, coexisting ions on performance studied, results showed that certain amounts Na+, Mg2+, K+, Ca2+ almost negligible, still maintained more than 90% initial after six cycles, highlights wide application prospects field treatment future. Therefore, exhibits uranium-extraction ability, anti-interference stability, low-cost advantage. It holds great extracting radioactive uranium from wastewater.

Language: Английский

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Ni(OH)₂/CoWO₄ S-Scheme Heterojunction for Enhanced Photocatalytic Hydrogen Evolution

ACS Applied Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 16, 2025

Language: Английский

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Diketopyrrolopyrrole-triggered low exciton binding energy in D-A covalent organic framework for enhanced uranyl photoreduction

Separation and Purification Technology, Journal Year: 2024, Volume and Issue: 359, P. 130376 - 130376

Published: Nov. 12, 2024

Language: Английский

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Defect Engineering Enhancing Piezoelectric Catalytic Activity of Covalent Organic Framework Matrix Composites for Uranium Removal

Small, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 1, 2024

Abstract Piezoelectric catalysis is an emerging green strategy, but the existing piezoelectric heterostructures are not sufficient in performance for catalytic reduction of low‐reduction potential uranium under harsh conditions. This study innovatively employs a defect heterogeneous engineering wherein covalent organic frameworks (COFs) grown situ on surface zinc oxide (ZnO) via Schiff base reactions, and defects introduced into COF shell layer imine exchange reactions to construct D‐COF@ZnO removal. The comprehensive shows that increases asymmetry induced polarization material promote charge redistribution, thus significantly improves activity catalysis. In addition, optimizes nanosize expose richer array active sites, resulting ultra‐fast U(VI) removal kinetics ultra‐high capacity. actual nuclear wastewater settings, demonstrates outstanding selective efficacy uranium, manifesting its considerable application efficiency superiority. strategy holds profound implications facilitating technology environmental protection domains such as removal, value.

Language: Английский

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Spatial Microenvironment Enhanced Photocatalytic Reduction of Uranyl Ions Under Solar Light Irradiation

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 484, P. 136708 - 136708

Published: Nov. 29, 2024

Language: Английский

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Water-stable perovskite nanotube array with enhanced transport of charge carriers induced by functionalized polyoxometalate for highly-efficient photoreduction of uranium(VI)

Inorganic Chemistry Frontiers, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 14, 2024

An enhanced water-stable perovskite nanotube array-based catalyst, (HMTA) 3 Pb 2 Br 7 @STA-PW 12 , was constructed, which shows highly-efficient activity for the photoreduction of U( vi ).

Language: Английский

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