Using photolysis method, Preyssler acid, H14[NaP5W30O110], was employed in the form of
composite film as a green reductant and stabilizer for the synthesis of Au nanoparticles. The synthesized
Au NPs/Preyssler film was prepared by a simple and fast sol-gel method and characterized by
UV-Visible spectroscopy, particle size distribution, Field Emission Scanning Electron Microscopy
(FESEM), and Energy Dispersive Spectroscopy (EDS) analysis. Our findings showed that Au
nanoparticles were obtained at about 6-11 nm and were readily inserted and monodispersed in the
nanocomposite film. The photocatalytic performance of this NPs/Preyssler film was examined in
decolorization of methyl orange (MeO) in aqueous media. UV-Visible studies showed that Au
NPs/Preyssler film can efficiently catalyze the decolorization of the aforementioned azo dye. The
pseudo-first-order rate constants were also calculated for this reaction.
Keywords: Decolorization, gold nanoparticles, heteropolyacid, nanocatalyst, photochromic film, preyssler.
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