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2015 | 2 | 1 |
Article title

Catalytic Activity of Gold and Silver Nanoparticles
Supported on Zinc Oxide

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Gold (AuNPs) and silver (AgNPs) nanoparticles
have been prepared by “one-pot” synthetic method in the
presence of poly(N-vinylpyrrolidone) (PVP). Absorption
spectra, size, morphology, and structure of AuNPs and
AgNPs were studied by UV-Vis spectroscopy, DLS, SEM,
and TEM. According to DLS measurements the average
sizes of metal nanoparticles stabilized by PVP in aqueous
solution are varied from 10 to 25 nm for AuNPs and from
6.5 to 44 nm for AgNPs. The impregnation method is used
to support AuNPs and AgNPs on the surface of ZnO. The
amount of AuNPs and AgNPs immobilized on the surface
of ZnO does not exceed 0.2 wt.%. The catalytic activity of
AuNPs and AgNPs supported on the surface of ZnO was
evaluated with respect to decomposition of hydrogen
peroxide. The optimal conditions for H2O2 decomposition
were found to be dependent on of the amount of the catalyst,
concentration of substrate, molecular weight of PVP, and
temperature. The activation energy of H2O2 decomposition
is equal to 44.1 kJ×mol-1. The decomposition of H2O2 in the
presence of AuNPs and AgNPs supported on ZnO surface
is discussed in the context of supramolecular catalysis
mimicking catalase-like behavior. The recyclability of
AuNPs supported on ZnO surface was tested.
Physical description
17 - 11 - 2014
17 - 11 - 2014
2 - 2 - 2015
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