Facile synthesis of bifunctional Fe3O4/Au nanocomposite and their application in catalytic reduction of 4-nitrophenol

Yan, Feng; Sun, Rongyan

doi:10.1016/j.materresbull.2014.06.012

Cited by 39 publications

(14 citation statements)

References 30 publications

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“…Inspired by the experimental results, they put forward a mechanism to synthesize bifunctional Fe 3 O 4 @Au nanocomposites, as shown in Scheme 4 . Carboxylic acid groups adsorbed AuCl 4 under acidic condition, and then NaBH 4 was added to form zero-valent Au which attached to Fe 3 O 4 NPs through the chemistry of the carboxylate group, and gradually the gold shell was formed around Fe 3 O 4 NPs [ 124 ]. Hydroxylamine hydrochloride is another reducing agent used [ 125 ].…”

Section: Surface Modification Of Magnetic Iron Oxide Nanoparticlesmentioning

confidence: 99%

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Surface Modification of Magnetic Iron Oxide Nanoparticles

et al. 2018

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Functionalized iron oxide nanoparticles (IONPs) are of great interest due to wide range applications, especially in nanomedicine. However, they face challenges preventing their further applications such as rapid agglomeration, oxidation, etc. Appropriate surface modification of IONPs can conquer these barriers with improved physicochemical properties. This review summarizes recent advances in the surface modification of IONPs with small organic molecules, polymers and inorganic materials. The preparation methods, mechanisms and applications of surface-modified IONPs with different materials are discussed. Finally, the technical barriers of IONPs and their limitations in practical applications are pointed out, and the development trends and prospects are discussed.

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Section: Surface Modification Of Magnetic Iron Oxide Nanoparticlesmentioning

confidence: 99%

“… Schematic illustration of the bifunctional Fe 3 O 4 /Au nanocomposites. Reproduced with permission from [ 124 ]. Copyright Elsevier, 2014.…”

Section: Figures Schemes and Tablesmentioning

confidence: 99%

Surface Modification of Magnetic Iron Oxide Nanoparticles

et al. 2018

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“…However, the weak electrostatic interactions among positively-charged amino groups and negatively-charged Au NPs are unreliable, resulting in the partial separation of Au NPs from the polymers. Yan et al [ 42 ] prepared bifunctional Fe 3 O 4 /Au nanocomposites by the direct reduction of HAuCl 4 in the presence of carboxylate-functionalized Fe 3 O 4 particles. Liu and co-workers [ 43 ] recently discovered that the bidentate ligands with two chelating sulfur groups such as the dithiocarbamates (DTCs) featuring carbodithioate (CS 2 ) groups were more stable than other common ligands such as thiol and amino groups in adsorbing onto the surfaces of Au NPs, indicating that the PEI-DTC polymers may boost the Au NPs’ adhesive force onto Fe 3 O 4 hollow microspheres’ surfaces.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Catalytic Reduction of 4-Nitrophenol Driven by Fe3O4-Au Magnetic Nanocomposite Interface Engineering: From Facile Preparation to Recyclable Application

et al. 2018

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In this work, we report the enhanced catalytic reduction of 4-nitrophenol driven by Fe3O4-Au magnetic nanocomposite interface engineering. A facile solvothermal method is employed for Fe3O4 hollow microspheres and Fe3O4-Au magnetic nanocomposite synthesis via a seed deposition process. Complementary structural, chemical composition and valence state studies validate that the as-obtained samples are formed in a pure magnetite phase. A series of characterizations including conventional scanning/transmission electron microscopy (SEM/TEM), Mössbauer spectroscopy, magnetic testing and elemental mapping is conducted to unveil the structural and physical characteristics of the developed Fe3O4-Au magnetic nanocomposites. By adjusting the quantity of Au seeds coating on the polyethyleneimine-dithiocarbamates (PEI-DTC)-modified surfaces of Fe3O4 hollow microspheres, the correlation between the amount of Au seeds and the catalytic ability of Fe3O4-Au magnetic nanocomposites for 4-nitrophenol (4-NP) is investigated systematically. Importantly, bearing remarkable recyclable features, our developed Fe3O4-Au magnetic nanocomposites can be readily separated with a magnet. Such Fe3O4-Au magnetic nanocomposites shine the light on highly efficient catalysts for 4-NP reduction at the mass production level.

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“…They exhibit excellent photocatalytic activities under both UV and visible lights 42 . A wide variety of Au materials find applications in the degradation of organo-pollutants, biological transmission electron microscopy, colorimetric DNA sensing, biomedical applications and catalysis 43 , 44 . Their unique catalytic activity which relied on its negative redox potential, found being much smaller than bulk gold 43 – 51 .…”

Section: Introductionmentioning

confidence: 99%

In situ decoration of Au NPs over polydopamine encapsulated GO/Fe3O4 nanoparticles as a recyclable nanocatalyst for the reduction of nitroarenes

Hemmati

Heravi

Veisi

2021

Sci Rep

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A new and efficient catalyst has been designed and prepared via in situ immobilization of Au NPs fabricated polydopamine (PDA)-shelled Fe3O4 nanoparticle anchored over graphene oxide (GO) (GO/Fe3O4@PDA/Au). This novel, architecturally interesting magnetic nanocomposite was fully characterized using different analytical techniques such as Field Emission Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, elemental mapping, Transmission Electron Microscopy, Fourier Transformed Infrared Spectroscopy, X-ray Diffraction and Inductively Coupled Plasma-Atomic Electron Spectroscopy. Catalytic activity of this material was successfully explored in the reduction of nitroarenes to their corresponding substituted anilines, using NaBH4 as reducing agent at ambient conditions. The most significant merits for this protocol were smooth and clean catalysis at room temperature with excellent productivity, sustainable conditions, ease of separation of catalyst from the reaction mixture by using a magnetic bar and most importantly reusability of the catalyst at least 8 times without any pre-activation, minimum loss of activity and considerable leaching.

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Facile synthesis of bifunctional Fe3O4/Au nanocomposite and their application in catalytic reduction of 4-nitrophenol

Cited by 39 publications

References 30 publications

Surface Modification of Magnetic Iron Oxide Nanoparticles

Surface Modification of Magnetic Iron Oxide Nanoparticles

Enhanced Catalytic Reduction of 4-Nitrophenol Driven by Fe3O4-Au Magnetic Nanocomposite Interface Engineering: From Facile Preparation to Recyclable Application

In situ decoration of Au NPs over polydopamine encapsulated GO/Fe3O4 nanoparticles as a recyclable nanocatalyst for the reduction of nitroarenes

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