Enhanced catalytic activity of Au nanoparticles self-assembled on thiophenol functionalized graphene

Ren, Ren; Li, Shuwen; Li, Jing; Ma, Jinxing; Liu, Hengzhi; Ma, Jiantai

doi:10.1039/c4cy01620c

Cited by 19 publications

(14 citation statements)

References 47 publications

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“…Graphene was functionalized with thiol groups by means the reaction of 4‐aminothiophenol and isoamylnitrite in presence of graphene sheets according to Tour's protocol. Subsequently, the impregnation of the obtained material with HAuCl 4 and the following reduction with NaBH 4 led to the formation of material 124 . The strong interaction between Au and thiol groups originated small metal NPs (1.5 nm) with a narrow size distribution and well dispersed onto the surface of 124 .…”

Section: Graphene‐ Graphene Oxide‐ and Reduced Graphene Oxide‐based mentioning

confidence: 99%

Modified Nanocarbons for Catalysis

2018

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Nanocarbons represent useful scaffolds in the preparation of last generation nanostructured catalysts, and their chemical functionalization through covalent or non‐covalent modification is becoming an important tool for introducing well‐distributed anchoring points and, in the meantime, could be the first step toward the assembling of hybrid nanostructured materials with a hierarchical order. In this Review are reported synthesis and catalytic applications of chemically modified nanocarbons such as fullerene, carbon nanotubes, graphene, nanohorns and nanodiamonds in organocatalytic and metal‐based (metal nanoparticles, organometallic complexes) reactions, covering major chemical reactions encompassing, the oxidation of alcohols, aldehydes, olefins, and silanes, hydrogenation reactions of aldehydes, ketones, and alkenes, dehydrogenative coupling of silanes, C−C coupling reactions, epoxidation of alkenes, CO2 fixation into cyclic carbonates, and asymmetric reactions, among others.

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Section: Graphene‐ Graphene Oxide‐ and Reduced Graphene Oxide‐based mentioning

confidence: 99%

Modified Nanocarbons for Catalysis

2018

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“…A Schottky barrier was formed at the interface of Gr and Au particles because of the higher work function of Au than that of Gr. Thus, the degradation rate considerably increased under visible light irradiation [ 40 , 41 , 42 , 43 ]. The electrons injected on the Gr surface subsequently moved to Au NPs, which spatially separated MB + and electrons.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Properties of Graphene/Gold and Graphene Oxide/Gold Nanocomposites Synthesized by Pulsed Laser Induced Photolysis

et al. 2020

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Graphene (Gr)/gold (Au) and graphene-oxide (GO)/Au nanocomposites (NCPs) were synthesized by performing pulsed-laser-induced photolysis (PLIP) on hydrogen peroxide and chloroauric acid (HAuCl4) that coexisted with Gr or GO in an aqueous solution. A 3-month-long aqueous solution stability was observed in the NCPs synthesized without using surfactants and additional processing. The synthesized NCPs were characterized using absorption spectroscopy, transmission electron microscopy, Raman spectroscopy, energy dispersive spectroscopy, and X-ray diffraction to prove the existence of hybrid Gr/Au or GO/Au NCPs. The synthesized NCPs were further evaluated using the photocatalytic reaction of methylene blue (MB), a synthetic dye, under UV radiation, visible light (central wavelength of 470 nm), and full spectrum of solar light. Both Gr/Au and GO/Au NCPs exhibited photocatalytic degradation of MB under solar light illumination with removal efficiencies of 92.1% and 94.5%, respectively.

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“…The short hydrogen bond distance O ---H-O-H (1.631 Å) in the PdO/H2O complex, along with a significant negative chargetransfer from PdO to H2O (-0.085 e), points to a form of palladium oxide strongly bound to water. Finally, we have evaluated the catalytic activity of our PdO nanoparticles by monitoring the reduction of p-nitrophenol (PNP) in borohydride solution, which is only possible in the presence of an appropriate catalyst [46] and represents a classical test for its efficiency [47][48][49][50][51]. By adding NaBH 4 , the aqueous solution of PNP becomes alkaline and the absorption band of p-nitrophenolate occurs at 400 nm in the absorption spectrum, which does not appreciably decrease in time.…”

Section: Scheme 1 Proposed Mechanism Of Formation Of Palladium Oxidementioning

confidence: 99%

Palladium Oxide Nanoparticles: Preparation, Characterization and Catalytic Activity Evaluation

et al. 2020

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Stable palladium oxide nanoparticles were prepared in aqueous suspension with a very simple procedure, by dissolving palladium nitrate in water at a concentration around 10−4 M. UV-visible absorption spectroscopy was adopted to follow the formation of these nanoparticles, which were characterized by TEM microscopy, along with XRD, XPS and Raman measurements. DFT calculations allowed to interpret the Raman data and to clarify the species present at the surface of the nanoparticles. The catalytic activity of the latter was evaluated by monitoring the reduction of p-nitrophenol to p-aminophenol. This investigation paves the way to the use of these colloidal nanoparticles in processes of heterogeneous catalysis, in particular those concerning the catalytic degradation of aromatic derivatives that represent a serious danger for the environment as pollutants, as in the case of p-nitrophenol.

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Enhanced catalytic activity of Au nanoparticles self-assembled on thiophenol functionalized graphene

Cited by 19 publications

References 47 publications

Modified Nanocarbons for Catalysis

Modified Nanocarbons for Catalysis

Photocatalytic Properties of Graphene/Gold and Graphene Oxide/Gold Nanocomposites Synthesized by Pulsed Laser Induced Photolysis

Palladium Oxide Nanoparticles: Preparation, Characterization and Catalytic Activity Evaluation

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