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Mater Sci Nanotechnol 2017 | Volume 1 Issue 2
allied
academies
Nanomaterials and Nanochemistry
November 29-30, 2017 | Atlanta, USA
International Conference on
Z
ero-Valent Iron (Fe0) has been shown to detoxify
water by creating hydroxyl radicals through Fenton-like
reactions combined with hydrogen peroxide (H
2
O
2
) to get
rid of organic contaminants. Nano-sized zero-valent iron
(n/ZVI) in combination with oxidants and UV radiation, has
been reported can increase the Fenton reaction rate and
make water detoxification more effective. In this work, the
production of reactive oxygen species, particularly hydroxyl
radicals, was assessed for the heterogeneous photo-assisted
Fenton-like reaction using nZVI embedded in a mesoporous
silica matrix, hydrogen peroxide, and UV-A radiation. The
experiments consisted of preparing a 10 µM solution of
N, N-dimethyl-p-nitroaniline (pNDA, used as HO• radical
probe) in 100 mL of water and adding the silica-embedded
nZVI at three different loads (please include loads of Zvi in
the SBA-15) with or without H
2
O
2
, and/or UV-A radiation
(λmax=365 nm). The absorbance of the pNDA was measured
and compared to that of clear, deionized water. The trials
consisted of using immobilized nZVI alone, immobilized nZVI/
H
2
0
2
, and immobilized nZVI/H
2
0
2
/UV. From the experimental
results, we have seen that the best conditions for hydroxyl
radicals production measured as pNDA bleaching are by the
combination of immobilized nZVI/H
2
O
2
/UV despite nZVI,
UV-A radiation and hydrogen peroxide alone were capable
of bleaching pNDA to a certain extent. The use of the H
2
O
2
/
UV system reached a plateau in hydroxyl radical production
after 20 min of reaction. Two kinetic models are proposed
to fit experimental data for the different reaction conditions
tested and the obtained results were capable of fitting
experimental data fairly good meaning that the proposed
reaction mechanisms may occur within the reaction mixture
to some extent. This novelmaterial foundwaswith interesting
capabilities to produce reactive oxygen species, particularly
hydroxyl radicals, under photo assisted conditions and high
potential for further photocatalytic applications in water
treatment.
Speaker Biography
Erick R. Bandala is currently working as, Assistant Research Professor for Advanced
Water Technologies at the Desert Research Institute in Las Vegas, NV. Dr. Bandala
holds Ph.D degree in Engineering, a Master degree in Organic Chemistry and a B.S.
degree in Chemical Engineering. He has been faculty member of the department of
Civil and Environmental Engineering (2007-2013) and the Department of Chemical,
Food and Environmental Engineering (2013-2015) at Universidad de Las Americas
Puebla, Mexico and titular researcher (1993-2007) at the Mexican Institute of Water
Technology (belonging to the Ministry of Environment Mexico) in Morelos, Mexico.
He has research interests in several different topics related with Environmental
Engineering including A) Mechanistic aspects of the use and application of solar driven
advanced oxidation processes (AOPs) for environmental restoration B) Development of
advanced water and soil treatment for site restoration C) Synthesis, characterization
and application of nanomaterials for Indoor Farming systems D) Development of
Climate Change adaptation methodologies for water security. As result of his research
activities, Dr. Bandala is author or co-author of over 100 international publication
including 80 peer-reviewed papers in international journals with high impact index
(average impact factor 2.9, >1790 citations, h-index 23); 5 books, 25 book chapters and
65 works published in proceedings of international conferences.
e:
erick.bandala@dri.eduErick R Bandala
Desert Research Institute, USA
Nanotechnology applications for water decontamination and disinfection: Current
achievements and further research avenues