Title of article :
Gold nanoparticles Wells–Dawson heteropolyacid nanocomposite film as an effective nanocatalyst in photocatalytic removal of azo dyes from wastewaters
Author/Authors :
Rohani, Neda Department of Chemistry - Arak Branch - Islamic Azad University, Arak , Bamoharram, Fatemeh F Department of Nanobiotechnology - Mashhad Branch - Islamic Azad University, Mashhad , Marjani, Azam Department of Chemistry - Arak Branch - Islamic Azad University, Arak , Heravi, Majid M Department of Chemistry - Alzahra University, Tehran
Abstract :
A novel nanophotochromic film consisting of
Au nanoparticles and Wells–Dawson-type heteropolyacid,
[H6P2W18O62], was prepared by combination of
sol–gel and photoreduction method. This film was
characterized by UV–visible spectroscopy, particle size
distribution, Field emission scanning electron microscopy,
and energy dispersive spectroscopy analysis. For
the preparation of Au nanoparticles, heteropolyacid,
[H6P2W18O62] was used in form of composite film as a
green reductant and stabilizer. Au nanoparticles with
particle size in the range of 10–20 nm were synthesized
and monodispersed in the nanocomposite using dip
coating method. The photocatalytic activity of this
composite film was studied in the decolorization of
methyl orange (MeO) and methyl red (MR) as carcinogenic
pollutant dyes using UV irradiation. The pseudofirst
order rate constants was established and calculated
for these reactions. Comparison of this composite film
with the prepared composite by Preyssler heteropolyacid
disclosed that the structure of heteropolyacid can affect
loading amount of Au nanoparticles.
Keywords :
Decolorization , Gold nanoparticles , Heteropolyacid , Nanocomposite , Wells–Dawson
Journal title :
Astroparticle Physics
