Gold nanoparticles immobilized in hyperbranched polyethylenimine modified polyacrylonitrile fiber as highly efficient and recyclable heterogeneous catalysts for the reduction of 4-nitrophenol

Wang, Manling; Jiang, Tingting; Lü, Yang; Liu, Hua‐Ji; Chen, Yu

doi:10.1039/c3ta10293a

Cited by 145 publications

(66 citation statements)

References 65 publications

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“…Sodiumb orohydride is one of the most commonly employed reducing agents for nitroarenes under metal nanoparticle cat- alysis. [23][24][25] However,i nm anyc ases the reactivity studies have been limited to the model reduction of p-nitrophenol to p-nitroaniline. We were interested in broadening the scope of this reactionb yp erforming the selective reduction of the nitro group even in the presence of other sensitive functional groups under mild reaction conditions in an aqueous medium.…”

Section: Reduction Of Nitroarenes In Water Underc Atalysis By Gold Namentioning

confidence: 99%

Water‐Soluble Gold Nanoparticles: From Catalytic Selective Nitroarene Reduction in Water to Refractive Index Sensing

Guo

Pleixats

Shafir

2015

Chemistry An Asian Journal

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Abstract:Water-soluble gold nanoparticles (Au NPs) stabilized by a nitrogen-rich PEG-tagged substrate have been prepared by reduction of HAuCl4 with NaBH4 in water at room temperature. The morphology and size of the nanoparticles can be controlled by simply varying the gold/stabilizer ratio. The nanoparticles have been fully characterized by TEM, HRTEM, ED, EDS, UV-vis, p-XRD and elemental analysis. The material is efficient as a recyclable catalyst for the selective reduction of nitroarenes with NaBH4 to yield the corresponding anilines in water at room temperature. Furthermore, the potential ability of the Au NPs as a refractive index sensor due to their localized surface plasmon resonance (LSPR) effect has also been assessed.

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Section: Reduction Of Nitroarenes In Water Underc Atalysis By Gold Namentioning

confidence: 99%

Water‐Soluble Gold Nanoparticles: From Catalytic Selective Nitroarene Reduction in Water to Refractive Index Sensing

Guo

Pleixats

Shafir

2015

Chemistry An Asian Journal

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“…Thus, an important task in utilization of metal nanoparticles in catalysis is preventing them from aggregation. This may be achieved by surrounding the NPs with organic ligands or inorganic ions, encapsulating the active NPs in organic fibrous material or in the rigid matrix, creating a core-shell morphology, or immobilizing of the nanoparticles on the solid substrates [7][8][9][10][11]. Additionally, the particles' supports play an important role in the development of composite heterogeneous catalysts which may be easily separated from the reaction environment after termination of the catalytic reaction, being beneficial for reducing the cost of the whole catalytic process.…”

Section: Introductionmentioning

confidence: 99%

Kinetic studies of catalytic reduction of 4-nitrophenol with NaBH4 by means of Au nanoparticles dispersed in a conducting polymer matrix

Fedorczyk

Ratajczak

Kuzmych

et al. 2015

J Solid State Electrochem

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In this work, we present a method of obtaining of effective catalytic system composed of conducting polymer, poly(1,8-diaminocarbazole) (PDACz), with Au nanoparticles (AuNPs) of diameter 2 nm uniformly dispersed in the polymer matrix. Reduction of 4-nitrophenol (4-NPh) by NaBH 4 with the use of this catalyst was studied by means of UV-Vis spectroscopy. It was shown that the catalytic reaction obeys either pseudo-zero-order or first-order kinetics, depending on the concentration of 4-NPh in the solution at excessive amount of borohydride. The catalytic activity of PDACz/AuNP system is discussed in terms of amount of deposited nanoparticles and the number of consecutive catalytic cycles. The kinetic data are correlated with scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images of the system before and after catalytic process.

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“…Finally, to complete investigations on catalytic properties of these materials, the reduction of nitroaromatics was chosen as a further benchmark for evaluating their performances [59,60,61,62,63]. …”

Section: Resultsmentioning

confidence: 99%

Catalytic Activity of Silicon Nanowires Decorated with Gold and Copper Nanoparticles Deposited by Pulsed Laser Ablation

et al. 2018

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Silicon nanowires (SiNWs) decorated by pulsed laser ablation with gold or copper nanoparticles (labeled as AuNPs@SiNWs and CuNPs@SiNWs) were investigated for their catalytic properties. Results demonstrated high catalytic performances in the Caryl–N couplings and subsequent carbonylations for gold and copper catalysts, respectively, that have no precedents in the literature. The excellent activity, attested by the very high turn over number (TON) values, was due both to the uniform coverage along the NW length and to the absence of the chemical shell surrounding the metal nanoparticles (MeNPs). A high recyclability was also observed and can be ascribed to the strong covalent interaction at the Me–Si interface by virtue of metal “silicides” formation.

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Gold nanoparticles immobilized in hyperbranched polyethylenimine modified polyacrylonitrile fiber as highly efficient and recyclable heterogeneous catalysts for the reduction of 4-nitrophenol

Cited by 145 publications

References 65 publications

Water‐Soluble Gold Nanoparticles: From Catalytic Selective Nitroarene Reduction in Water to Refractive Index Sensing

Water‐Soluble Gold Nanoparticles: From Catalytic Selective Nitroarene Reduction in Water to Refractive Index Sensing

Kinetic studies of catalytic reduction of 4-nitrophenol with NaBH4 by means of Au nanoparticles dispersed in a conducting polymer matrix

Catalytic Activity of Silicon Nanowires Decorated with Gold and Copper Nanoparticles Deposited by Pulsed Laser Ablation

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