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AgPt nanoparticles supported on magnetic graphene oxide nanosheets for catalytic reduction of 4-nitrophenol: studies of kinetics and mechanism

Kohantorabi, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/aoc.3806
  3. Abstract:
  4. AgxPt100−x (x = 0, 25, 50, 75 and 100) nanoparticles were grown on the surface of magnetic graphene oxide nanosheets (Fe3O4@GO) for the first time. The as-prepared nanocomposites were characterized using various techniques such as Fourier transform infrared spectroscopy, powder X-ray diffraction, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, Brunauer–Emmett–Teller surface area analysis, vibrating sample magnetometry and thermogravimetric analysis. The Fe3O4@GO-AgxPt100−x catalysts were applied in the reduction of 4-nitrophenol (4-NP) to 4-aminophenol using sodium borohydride (NaBH4). The synthesized nanocomposites exhibited excellent catalytic performance in the reduction of 4-NP with high recyclability for five consecutive runs. The Fe3O4@GO-Ag75Pt25 nanocomposite exhibited the best catalytic activity with a rate constant as high as 140.6 × 10−3 s−1. The obtained kinetic data were modelled with the Langmuir–Hinshelwood equation. The energy of activation and thermodynamic parameters including enthalpy, entropy of activation and activation Gibbs free energy were calculated. Copyright © 2017 John Wiley & Sons, Ltd
  5. Keywords:
  6. 4-nitrophenol reduction ; Langmuir–hinshelwood isotherm ; Activation energy ; Catalysis ; Catalyst activity ; Chemical activation ; Electron microscopy ; Energy dispersive spectroscopy ; Field emission microscopes ; Fourier transform infrared spectroscopy ; Free energy ; Gibbs free energy ; Graphene ; High resolution transmission electron microscopy ; Magnetometry ; Nanocomposites ; Nanomagnetics ; Nanoparticles ; Nanosheets ; Platinum ; Rate constants ; Scanning electron microscopy ; Thermogravimetric analysis ; Transmission electron microscopy ; X ray diffraction ; X ray spectroscopy ; 4-Nitrophenol reductions ; Brunauer-emmett-teller surface areas ; Energy dispersive X ray spectroscopy ; Field emission scanning electron microscopy ; Graphene oxide nanosheets ; Langmuir hinshelwood equation ; Langmuir-Hinshelwood ; Vibrating sample magnetometry ; Silver
  7. Source: Applied Organometallic Chemistry ; Volume 31, Issue 11 , 2017 ; 02682605 (ISSN)
  8. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/aoc.3806