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Reduced graphene oxide supported AgxNi100−x alloy nanoparticles: a highly active and reusable catalyst for the reduction of nitroarenesElectronic supplementary information (ESI) available: XRD spectra of Ag25Ni75/RGO, Ni/RGO, in situ Ag50Ni50/C and in situ Ag50Ni50/SBA-15 samples. Low resolution TEM images, EDS analysis of Ag25Ni75/RGO, Ag75Ni25/RGO samples, plots of ln(At/A0) versus time for rate constant calculations of nanocomposite samples and tandem reduction reactions, the XRD spectrum and
The synthesis of supported, small sized, monodisperse, surfactant free bimetallic nanoparticles (NPs) is of great importance in the field of catalysis. In this paper, we report a facile and green method to synthesize Ag x Ni 100− x ( x = 25, 50, 75, and 100) alloy NPs decorated on reduced graphene o...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Online Access: | Get full text |
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| Summary: | The synthesis of supported, small sized, monodisperse, surfactant free bimetallic nanoparticles (NPs) is of great importance in the field of catalysis. In this paper, we report a facile and green method to synthesize Ag
x
Ni
100−
x
(
x
= 25, 50, 75, and 100) alloy NPs decorated on reduced graphene oxide (RGO) nanosheets by an
in situ
chemical co-reduction process for the first time. The resulting products were well characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), high resolution TEM (HRTEM), X-ray photoelectron microscopy (XPS) and inductively coupled plasma atomic absorption spectroscopy (ICP-AES). The
in situ
synthesized Ag
x
Ni
100−
x
/RGO alloy nanocomposites showed remarkable composition dependent catalytic activity towards the reduction of 4-nitrophenol by NaBH
4
with one of the best activity parameters (968 s
−1
g
−1
). The enhanced catalytic performance was observed for RGO supported NPs as compared to that of bare AgNi alloy NPs and the
in situ
synthesized Ag
50
Ni
50
/RGO sample was identified to be the highest active among the as-obtained nanocomposite samples. The Ag
50
Ni
50
/RGO sample catalyzed the reduction of other nitroarenes in such a way that we obtained the best ever activity parameter for those reactions also. Furthermore, the effect of support materials (activated carbon, SBA-15 or RGO) and reducing agents (ammonia borane or sodium borohydride) was studied on the catalytic activity of Ag
50
Ni
50
alloy NPs. In addition, Ag
x
Ni
100−
x
/RGO nanocomposites showed excellent recycling stabilities which may lead to the use of the present nanocatalyst in many more industrially important catalytic applications.
Use of RGO supported Ag
x
Ni
100−
x
alloy nanoparticles showing high activity and stability in the reduction of nitroarenes. |
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| ISSN: | 2050-7488 2050-7496 |
| DOI: | 10.1039/c5ta03779d |