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conferenceseries.com
Volume 7, Issue 6 (Suppl) J Nanomed Nanotechnol
ISSN: 2157-7439 JNMNT, an open access journal Nanotek 2016
December 05-07, 2016
December 05-07, 2016 Phoenix, USA
13th International Conference on
Nanotek & Expo
J Nanomed Nanotechnol 2016, 7:6 (Suppl)
Polymer mediated synthesis of self assembled zinc-tin-oxide/acid functionalized nanodiamonds
nanoparticles as potential photocatalysts
Hameed Ullah, Uzma Malik
Hazara University, Pakistan
The multipurpose nanomaterial, Zinc Stannate (ZnSnO3), is one of the highly regarded photocatalysts. The photocatalytic
functionality of ZnSnO3 is particularly dependent over its microstructure, morphology and bandgap. The conventional solid state
methods are not suitable for its preparation owing to its metastability. Therefore, we come up with a strategically designed preparatory
method to get control over the microstructure, morphology and optical bandgaps of ZnSnO3 nanomaterials. Single phase and self
assembled ZnSnO3 nanoparticles having smaller bandgaps than the bulk are prepared and characterized. The metal ions were
stabilized by in situ polymer formation, and the subsequent oxidation with NH4OH ensured ZnSnO3. The polymer was finally
fired off at 400°C temperature which was established after TGA analysis of the metal oxide/polymer nanocomposites. The electron
microscopic study shows that the ZnSnO3 nanoparticles self assemble around the polymers which agglomerated into spheres, may
be due to the addition of aqueous solvent. The circularly self assembled structures further auto organized giving large assemblies
of nanoparticles. The XRD analysis revealed that the self assembled nanoparticles are in a single phase i.e. perovskite ZnSnO3. The
elemental compositions were established using EDX spectroscopy. The direct optical energy bandgaps were obtained for all the
samples using DRS spectra. It has been observed that bandgaps of ZnSnO3 nanoparticles prepared at pH 3 are smaller than those
obtained at pH 9. However, the overall bandgaps (2.66 – 3.25 eV) of ZnSnO3 nanoparticles were smaller than the bulk and earlier
reported ZnSnO3 nanomaterials (3.35 – 3.89 eV) . The decrease in bandgaps was due to the addition of AFNDs as we have observed
previously. Selective samples were used for photo-induced-degradation of Methylene blue dye, and it has been observed that more
than 90% dye decomposed within two hours of exposure time.
Comparison of different iron nanoparticles in their potential to combat contaminants in water.
Helga Sato1, Soroosh Dehkordi1, Jaeyun Moon1, Erick R. Bandala2
1University of Nevada, USA
2Desert Research Institute, USA
Nanoscale Zero-Valent Iron (nZVI) particles are known to be a great driver in combatting organic contaminants found in water.
Following a Fenton-like reaction model, the iron nanoparticles are able to oxidize the contaminants into harmless by-products
such as carbon dioxide and water. The conventional method to synthesize these nZVI particles presents an issue with toxic by-
products such as sodium borohydride, therefore another proposed method for producing various metallic nanoparticles provides
the use of plant extracts as the reducing agent to reduce Fe2+ or Fe3+ into the desire zero-valent iron, or Feo. Larrea tridentata (also
known as creosote bush) is commonly found in our desert region, and will be used as the plant material extract utilized in the plant
based production of nZVI particles. There is an optimal polyphenol content in the plant for the reaction with the iron salt solution
to occur and produce the desired hydroxyl radicals. To test the potential use of nZVI produced from plant mediated procedures,
commercial nZVI was tested against conventionally synthesized nZVI and plant extract synthesized nZVI in their ability to produce
OH radicals; the main transient species for oxidizing pollutants. The characteristics of the three types of nZVI will be assessed, as well
as the yields in hydroxyl radicals when reacted with hydrogen peroxide and UV radiation. The results showed that the nZVI form
produced via the conventional method showed the greatest potential in production of hydroxyl radicals, and the plant synthesized
nZVI was comparable in effectiveness when using a greater volume. Plant materials can be more involved in the production of these
nanoparticles in hopes that the process can be improved thus leading to less harmful chemical waste.