Photocatalytic degradation of dyes using starchassisted pure and doped WO3 nanoparticles
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Date
2024-07
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G. B. Pant University of Agriculture & Technology, Pantnagar-263145
Abstract
The present study deals with pure and starch-assisted pure and (Mn, Co, and
Mo) doped WO3 nanoparticles for the degradation of dyes in the presence of sunlight.
The natural polymer (starch) has been used as stabilizing agent to synthesize pure and
(Mn, Co, and Mo) doped WO3 nanoparticles by co-precipitation process. XRD,
FESEM, FTIR, UV-VIS and PL spectroscopy have been used to study the attributes of
synthesized WO3 nanoparticles. XRD analysis demonstrated that the WO3
nanoparticles prepared in starch media show a small average crystallite size compared
to WO3 nanoparticles prepared without starch. It was observed that starch acts as a
growth-regulating agent as well as dopants (Mn, Co, and Mo) do not affect the crystal
structure of WO3. FESEM analysis shows that starch-assisted pure and doped
nanoparticles show a more homogeneous and porous structure than WO3 nanoparticles
synthesized without starch. On increasing the concentration of the dopant, the average
diameter of doped nanoparticles decreases. The inclusion of Mn and Co dopants does
not affect the morphology of WO3, while Mo doping produced a change in the
morphology of WO3. With the help of UV-VIS technique, it has been observed that the
increase in dopant concentration narrows the bandgap energy. The defects generated on
the surface of the synthesized samples were analyzed by PL spectroscopy technique.
Starch produced large crystallographic defects on the WO3 nanoparticle surfaces, which
increased the rate of charge carrier separation. A comparison of starch-assisted pure
and (Mn, Co, and Mo) doped-WO3 for the degradation of organic dyes (Rhodamine-B
and Crystal Violet) from the wastewater in the presence of sunlight revealed that Modoped
WO3 nanoparticles show the highest photocatalytic activity as compared to the
pure, Mn, and Co-doped WO3 nanoparticles. From the present study, it is observed that
starch can be used as a suitable stabilizer for the synthesis of pure and doped WO3
nanoparticles. Also, it has been observed that doping is an effective strategy for
modifying the properties of WO3 nanoparticles and enhancing the photocatalytic
activity of the synthesized samples.
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Theses of Ph.D