Comparison of Hydrogen Bonded Organic Framework with Reduced Graphene Oxide-Pd Based Nanocatalyst: Which One Is More Efficient for Entrapment of Nitrophenol Pollutants?

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

Published: Jan. 29, 2025

In this study, a Pd nanoparticles@hydrogen-bonded organic framework (Pd NPs@HOF) thin film was fabricated at the toluene-water interface. The HOF formed through interaction of trimesic acid (TMA) and melamine (Mel) in water phase, while Pd(0) produced from reduction [PdCl2(cod)] phase. as-synthesized NPs@HOF demonstrated to be an effective catalyst for selective p-nitrophenol o-nitrophenol p-aminophenol o-aminophenol. porous network introduced strong active sites between Mel, TMA, Pd(0). Kinetic studies showed that exhibited enhanced rate comparison with Pd@reduced-graphene oxide (r-GO) rates were 1.7 times faster 1.5 or even 10 than some Pd-based catalysts, maximum conversion 97.1% which attributed higher porosity greater surface-to-volume ratio material. Furthermore, π-π stacking interactions enhance catalytic activity by increasing sites, stabilizing NPs trapping nitrophenols, facilitating electron transfer, providing synergistic effect. Also, contributions hydrogen bonding, van der Waals forces, electrostatic interactions, π-σ noncovalent are reasons better performance Pd/r-GO reduced functional groups.

Language: Английский

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Microwave‐Assisted One‐Step Synthesis of Palladium‐Encapsulated Covalent Organic Frameworks for Heterogeneous Catalysis

Chemistry - A European Journal, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 30, 2024

Abstract Metal‐encapsulated covalent organic frameworks (metal/COFs) represent an emerging paradigm in heterogeneous catalysis. However, the time‐intensive (usually 4 or more days) and tedious multi‐step synthesis of metal/COFs remains a significant stumbling block for their broad application. To address this challenge, we introduce facile microwave‐assisted situ metal encapsulation strategy to cooperatively combine COF formation palladium(II) one step. With unprecedented approach, synthesize diverse range palladium(II)‐encapsulated COFs (termed Mw‐Pd/COF) air within just hour. Notably, is scalable large‐scale production (~0.5 g). Leveraging high crystallinity, porosity, structural stability, representative Mw‐Pd/COF exhibits remarkable activity, functional group tolerance, recyclability Suzuki‐Miyaura coupling reaction at room temperature, surpassing most previously reported Pd(II)/COF catalysts with respect catalytic performance, preparation time, synthetic ease. This opens rapid avenue construct metal/COF hybrids, which hold enormous potential multitude applications including catalysis, sensing, energy storage.

Language: Английский

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Core–Shell–Satellite Au@CeO₂–Pd Plasmonical Photocatalysts for Suzuki–Miyaura Coupling Reaction

Applied Organometallic Chemistry, Journal Year: 2024, Volume and Issue: 39(3)

Published: Nov. 6, 2024

ABSTRACT Integration of localized surface plasmon resonance (LSPR) metallic nanocrystals into photocatalysis is an intriguing approach for light‐driven organic transformations. However, uncertain direction hot carriers a grand challenge, which fails to take full advantage the LSPR excitation. In this work, core–shell gold@ceria nanosphere–supported segregated palladium species (Au@CeO 2 –Pd) have developed steer light absorption capability and charge carrier migration. Under simulated solar irradiation, core–shell–satellite Au@CeO –Pd exhibited efficient harvesting colossal activity in Suzuki coupling reaction. The plasmon‐induced electrons overpassed Schottky barrier at interfaces migrated from Au core CeO shell accordingly. Subsequently, photogenerated core–shells Pd, acted as electron acceptor. Detailed photocatalytic mechanism studies revealed that both photoexcited holes were main active involved reaction process. particular, diphenyl yield over catalyst was ~1.7 times higher than Au@SiO –Pd, where 19‐nm‐thick SiO introduced prevent migration electrons. This distinctly certified transfer under illumination played important role drive Overall, design plasmonic photocatalyst has potential field photo‐driven

Language: Английский

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Sustainable Synthesis of Palladium‐Immobilized Covalent Organic Frameworks: A One‐step Sonochemical Strategy

Advanced Sustainable Systems, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 8, 2024

Abstract The rapid and environmentally benign synthesis of metal‐immobilized covalent organic frameworks (metal/COFs) for heterogeneous catalysis is a pervasive challenge, as the mainstream exceedingly time‐consuming (up to four days) demands use hazardous solvents. Herein, we describe sustainable efficient one‐step sonochemical strategy constructing diverse palladium (II)‐immobilized COFs (Pd(II)/COFs). By merging sonochemistry‐assisted COF in situ Pd (II) immobilization into single step, this enables formation Pd(II)/COF hybrids within an hour under ambient conditions using water solvent. Notably, gram‐scale Pd(II)/COFs achievable. resulting exhibit superb crystallinity high surface area, leading remarkable activity, excellent functionality tolerance, recyclability Suzuki–Miyaura cross‐coupling reaction aryl bromides arylboronic acids at room temperature. This effectively addresses long‐lasting limitations traditional multistep synthesis, paving fast avenue diversified metal/COF potentially other applications.

Language: Английский

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