Preparation of a novel palladium catalytic hydrogel based on graphene oxide/chitosan NPs and cellulose nanowhiskers

Ashiri, Samira; Mehdipour, Ebrahim

doi:10.1039/c8ra06623j

Cited by 25 publications

(11 citation statements)

References 45 publications

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“…They have been utilized extensively as catalysts in many reactions such as Suzuki, Heck‐Mizoraki, Sonogashira, Stille, Kumada, and Negishi cross‐coupling reactions . In the literature, the development of the several types of hydrogel‐palladium composite materials and investigation of their catalytic activities in various reactions was studied, but there is an only one study of the hydrogel‐palladium catalyst obtained by polymerization of NHC‐Pd‐pyridine complexes. Boztepe et al developed poly(AAm‐ co ‐AMPS)‐supported NHC‐Pd‐pyridine catalyst systems by polymerization of NHC‐Pd‐pyridine complexes with monomers.…”

Section: Introductionmentioning

confidence: 99%

The kinetics and mechanism of polymer‐based NHC‐Pd‐pyridine catalyzed heterogeneous Suzuki reaction in aqueous media

Boztepe

Künkül

Gürbüz

et al. 2019

Int J of Chemical Kinetics

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One of the most important challenges of the Suzuki reaction is a green synthesis of reaction products. In terms of economy and ecology, the Suzuki reaction details must be characterized for the industrial‐scale Suzuki reaction processes. In this paper, for the first time, a kinetic and mechanistic study on the Suzuki reaction catalyzed with hydrogel‐supported PEPPSI (pyridine‐enhanced precatalyst preparation stabilization (and) initiation) type NHC‐Pd‐pyridine composite has been investigated. To determine the rate‐limiting step, the effects of reactants and experimental conditions on the heterogeneous Suzuki reaction have been experimentally defined. The experimental results demonstrated that it is possible to reach 100% yield under the optimum reaction conditions, which were found as 75 × 10−3 mol/L of phenylboronic acid (FBA), 50 × 10−3 mol/L of bromoacetophenone (Brac), 125 × 10−3 mol/L of K2CO3, 1 g/L of catalyst, 80°C of reaction temperature, 400 rpm of mixing rate, and 3 h of reaction time. The transmetalation step in the cycle was defined as the rate‐limiting step. On the basis of kinetic results, a mathematical reaction rate expression was presented assuming the steady‐state approach to steps of the catalytic cycle. The activation energy (Ea) of the reaction was estimated to be 34.88 kJ/mol.

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Section: Introductionmentioning

confidence: 99%

The kinetics and mechanism of polymer‐based NHC‐Pd‐pyridine catalyzed heterogeneous Suzuki reaction in aqueous media

Boztepe

Künkül

Gürbüz

et al. 2019

Int J of Chemical Kinetics

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“…Hydrogels are widely employed for the green synthesis of nanoparticles. The hydrogels adsorb plenty of water and metal ions which can easily penetrate through the polymeric matrix of the hydrogel 28 . Initially, the plant seeds (200 g) were soaked in 1.0 L water at room temperature for 20 min.…”

Section: Methods Of Synthesismentioning

confidence: 99%

Hydrogel assisted synthesis of gold nanoparticles with enhanced microbicidal and in vivo wound healing potential

Batool

Muhammad

Iqbal

et al. 2022

Sci Rep

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The present study reports a hydrogel-based sunlight-assisted synthesis of gold nanoparticles (Au NPs) with enhanced antimicrobial and wound healing potential. The hydrogel extracted from the seeds of Cydonia oblonga was used as a reducing and capping agent to synthesize Au NPs for the first time. The as-synthesized Au NPs were characterized for an average size, shape, surface functionalization, antimicrobial, and wound healing capabilities. The cubic and rectangular-shaped Au NPs with an average edge length of 74 ± 4.57 nm depicted a characteristic surface plasmon resonance band at 560 nm. The hydrogel-based Au NPs inhibited the growth of microorganisms in zones with 12 mm diameter. In-vitro experiments showed that a minimum inhibitory concentration of Au NPs (16 µg/mL) was sufficient to mimic the 95% growth of pathogenic microorganisms in 24 h. In vivo treatment of wounds with Au NPs in murine models revealed a 99% wound closure within 5 days. Quantitative PCR analysis performed to decipher the role of Au NPs in enhanced wound healing showed an increase in the expression levels of NANOG and CD-34 proteins.

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“…GO nanosheets have also been combined with chitosan NPs and dialdehyde cellulose nanowhiskers to form a hydrogel support for Pd NPs [86]. The resulting catalyst was utilized to efficiently cross-couple various olefins with phenyl halides in aqueous ethanol under reflux in the presence of K 2 CO 3 .…”

Section: Cellulose Compositesmentioning

confidence: 99%

Wood-Sourced Polymers as Support for Catalysis by Group 10 Transition Metals

et al. 2022

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Despite providing interesting solutions to reduce the number of synthetic steps, to decrease energy consumption or to generate less waste, therefore contributing to a more sustainable way of producing important chemicals, the expansion of the use of homogeneous catalysis in industrial processes is hampered by several drawbacks. One of the most important is the difficulty to recycle the noble metals generating potential high costs and pollution of the synthesized products by metal traces detrimental to their applications. Supporting the metals on abundant and cheap biosourced polymers has recently appeared as an almost ideal solution: They are much easier to recover from the reaction medium and usually maintain high catalytic activity. The present bibliographical review focuses on the development of catalysts based on group 10 transition metals (nickel, palladium, platinum) supported on biopolymers obtained from wood, such as cellulose, hemicellulose, lignin, and their derivatives. The applications of these catalysts in organic synthesis or depollution are also addressed in this review with examples of C-C couplings, oxidation, or hydrogenation reactions.

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Preparation of a novel palladium catalytic hydrogel based on graphene oxide/chitosan NPs and cellulose nanowhiskers

Abstract: Pd NPs dispersed on a polysaccharide-based hydrogel as a novel catalyst show high catalytic activity and recyclability for coupling reactions.

Cited by 25 publications

References 45 publications

The kinetics and mechanism of polymer‐based NHC‐Pd‐pyridine catalyzed heterogeneous Suzuki reaction in aqueous media

The kinetics and mechanism of polymer‐based NHC‐Pd‐pyridine catalyzed heterogeneous Suzuki reaction in aqueous media

Hydrogel assisted synthesis of gold nanoparticles with enhanced microbicidal and in vivo wound healing potential

Wood-Sourced Polymers as Support for Catalysis by Group 10 Transition Metals

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