Polydopamine as a bridge to decorate monodisperse gold nanoparticles on Fe<sub>3</sub>O<sub>4</sub> nanoclusters for the catalytic reduction of 4-nitrophenol

Liu, Shili; Qileng, Aori; Huang, James; Gao, Qiongzhi; Liu, Yingju

doi:10.1039/c7ra09373j

Cited by 51 publications

(19 citation statements)

References 41 publications

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“…We believe this information will allow us to rationally design better catalytic systems with enantio-selective potential. We are also currently working on improving the reusability of FLPDA by addition of magnetic Fe 3 O 4 nanoparticles during co-polymerization to enable magnetically aided retrieval, which has already proven effective in various application using PDA (Liu et al, 2013, 2017; Xie et al, 2014; Yu et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

Flavin Conjugated Polydopamine Nanoparticles Displaying Light-Driven Monooxygenase Activity

Crocker

Fruk

2019

Front. Chem.

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A hybrid of flavin and polydopamine (PDA) has been explored as a photocatalyst, drawing inspiration from natural flavoenzymes. Light-driven monoxygenase activity has been demonstrated through the oxidation of indole under blue light irradiation in ambient conditions, to afford indigo and indirubin dyes. Compared to riboflavin, a flavin-polydopamine hybrid is shown to be more resistant to photobleaching and more selective toward dye production. In addition, it has been demonstrated that it can be recycled from the solution and used for up to four cycles without a marked loss of activity, which is a significant improvement compared to other heterogenous flavin catalysts. The mechanism of action has been explored, indicating that the PDA shell plays an important role in the stabilization of the intermediate flavin-peroxy species, an active component of the catalytic system rather than acting only as a passive nanocarrier of active centers.

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Section: Resultsmentioning

confidence: 99%

Flavin Conjugated Polydopamine Nanoparticles Displaying Light-Driven Monooxygenase Activity

Crocker

Fruk

2019

Front. Chem.

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“…The deconvolution of the O 1s spectra illustrated in Figure 10c,d resulted into four main peaks, O-C=O, C=O, C-O, and C-O-C, at binding energies of~530, 531, 533, and 535 eV, respectively [4]. The N 1s peak emerged in the GO-PDA spectra was deconvoluted and fitted into three main peaks at binding energies of 402, 399, and 396 eV corresponding to primary amine (N-H 2 ), secondary amine (N-H), and aromatic/tertiary amine (N-C) functional groups, respectively, as illustrated in Figure 10e [53][54][55]. The primary amine is linked to the dopamine, the secondary amine corresponds to the polydopamine and the tertiary amine corresponds to the tautomers of 5,6-dihydroxyindole and 5,6-indolequinone [54].…”

Section: Structural Properties Of Go and Go-pdamentioning

confidence: 99%

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

2021

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High-degree functionalization of graphene oxide (GO) nanoparticles (NPs) using polydopamine (PDA) was conducted to produce polydopamine functionalized graphene oxide nanoparticles (GO-PDA NPs). Aiming to explore their potential use as nanofiller in membrane separation processes, the spectral and structural properties of GO-PDA NPs were comprehensively analyzed. GO NPs were first prepared by the oxidation of graphite via a modified Hummers method. The obtained GO NPs were then functionalized with PDA using a GO:PDA ratio of 1:2 to obtain highly aminated GO NPs. The structural change was evaluated using XRD, FTIR-UATR, Raman spectroscopy, SEM and TEM. Several bands have emerged in the FTIR spectra of GO-PDA attributed to the amine groups of PDA confirming the high functionalization degree of GO NPs. Raman spectra and XRD patterns showed different crystalline structures and defects and higher interlayer spacing of GO-PDA. The change in elemental compositions was confirmed by XPS and CHNSO elemental analysis and showed an emerging N 1s core-level in the GO-PDA survey spectra corresponding to the amine groups of PDA. GO-PDA NPs showed better dispersibility in polar and nonpolar solvents expanding their potential utilization for different purposes. Furthermore, GO and GO-PDA-coated membranes were prepared via pressure-assisted self-assembly technique (PAS) using low concentrations of NPs (1 wt. %). Contact angle measurements showed excellent hydrophilic properties of GO-PDA with an average contact angle of (27.8°).

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“…Different magnetic polymer composites such as Fe 3 O 4 @polyaniline, Fe 3 O 4 @polypyrrole, Fe 3 O 4 @polydoapmine have previously been synthesized in situ and reported. The high density polar core structure was found being responsible for their high affinity towards the noble metals by the virtue of which their catalytic activity is undisputable 27 – 31 .…”

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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Polydopamine as a bridge to decorate monodisperse gold nanoparticles on Fe₃O₄ nanoclusters for the catalytic reduction of 4-nitrophenol

Abstract: The in situ assembly of Au nanoparticles on Fe3O4@PDA showed excellent recyclability and good stability for the catalytic reduction of 4-nitrophenol.

Cited by 51 publications

References 41 publications

Flavin Conjugated Polydopamine Nanoparticles Displaying Light-Driven Monooxygenase Activity

Flavin Conjugated Polydopamine Nanoparticles Displaying Light-Driven Monooxygenase Activity

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

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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Polydopamine as a bridge to decorate monodisperse gold nanoparticles on Fe3O4 nanoclusters for the catalytic reduction of 4-nitrophenol

Abstract: The in situ assembly of Au nanoparticles on Fe3O4@PDA showed excellent recyclability and good stability for the catalytic reduction of 4-nitrophenol.

Cited by 51 publications

References 41 publications

Flavin Conjugated Polydopamine Nanoparticles Displaying Light-Driven Monooxygenase Activity

Flavin Conjugated Polydopamine Nanoparticles Displaying Light-Driven Monooxygenase Activity

Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies

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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Polydopamine as a bridge to decorate monodisperse gold nanoparticles on Fe₃O₄ nanoclusters for the catalytic reduction of 4-nitrophenol