Enhancement of Photocatalytic Self-Fenton Degradation toward Sulfamethoxazole by Highly Symmetrical Triazine-based Covalent Organic Frameworks

Applied Catalysis B Environment and Energy, Journal Year: 2025, Volume and Issue: unknown, P. 125062 - 125062

Published: Jan. 1, 2025

Language: Английский

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The Direct Air Synthesis of Hydrogen Peroxide Induced by The Giant Built‐In Electric Field of Trz‐CN

Small Methods, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 14, 2025

Graphitic carbon nitride (C3N4) has been identified as an optimal material for hydrogen peroxide (H2O2) photosynthesis, although its utility is hampered by a high photocarrier recombination rate. Herein, novel with giant built-in electric field (BEF), Trz-CN, synthesized through hydrothermal-calcination tandem strategy. The BEF (4.8-fold) induced the large dipole moment facilitated efficient separation and directional migration of photogenerated carriers. Trz-CN exhibited H2O2 production rate 569.9 µmol·g-1·h-1 using O2 feedstock under visible light (λ > 420 nm), marking impressive 11.2-fold enhancement compared to bulk C3N4. Utilizing air instead pure resulted in trivial 1.6% decrease generation while maintaining substantial 560.6 µmol·g-1·h-1. Notably, showcased sterilization 99.9% against Escherichia coli (E. coli) natural seawater. Density functional theory (DFT) calculations revealed that incorporating nitrogen-rich skeleton into C3N4 enhanced oxygen adsorption capacity lowered energy barrier formation. This leads photocatalytic performance ambient conditions. provides new exploratory idea direct synthesis ballast water treatment.

Language: Английский

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Molecularly Tunable Donor–Acceptor Integrated Carbon Nitride for Sunlight‐Driven H₂O₂ Synthesis: Mechanism and Performance Insights

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

Published: March 16, 2025

Abstract Graphite phase carbon nitride (CN) emerges as a promising catalyst for sunlight‐driven H 2 O synthesis owing to its merits of stable physicochemical properties, distinctive electronic structure, adjustable bandgap, etc., yet poor charge behavior, especially high carrier recombination and low migration rate, limit photocatalytic activity. Herein, molecularly tunable donor‐acceptor (D‐A) integrated CN is fabricated via cytosine doping combined with molten salt‐assisted calcination. The utilized achieves the highest H₂O₂ yield 8.07 mmol g −1 h , which exceeds initial by factor 40.4, surpassing numerous reported CN‐based photocatalysts. Series characterizations/tests (e.g., transient absorption, steady‐state SPV spectra, KPFM) theoretical calculations HOMO/LUMO, adsorption energy) confirm that incorporation K + ‐C≡N pyrimidine ring disrupts symmetry establishes D‐A significantly augmenting separation photogenerated charges. capture experiment rotating disk electrode test affirm two‐step single electron oxygen reduction pathway occurs in process synthesis. This work offers novel approaches profound revelations development

Language: Английский

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Inducing Exciton Dissociation in Covalent Organic Framework by Local Gradient Ionic Polarization for Enhanced Hydrogen Peroxide Photosynthesis

Applied Catalysis B Environment and Energy, Journal Year: 2025, Volume and Issue: unknown, P. 125292 - 125292

Published: March 1, 2025

Language: Английский

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