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Nanomat 2019
Nano Research & Applications
ISSN: 2471-9838
Page 40
January 28-29, 2019
Barcelona, Spain
18
th
Edition of International Conference on
Emerging Trends in
Materials Science and
Nanotechnology
Nano Res Appl 2019, Volume 5
DOI: 10.21767/2471-9838-C1-031
Z
ero-valent iron nanoparticles and nanocomposites based on
them are being increasingly used in the purification of various
media such as sewage water and soils from persistent organic
pollutants (POPs). The main cause for the limited use of these
materials is the toxicity of iron nanoparticles with respect to soil
microorganisms. The design of a material (composite) exhibiting
reactivity in pesticide degradation and simultaneously having a
positive influence on the soil microflora is a problem of current
concern. We propose a nanocomposite based on bentonite of
grade (ERBSLÖH, PORE-Technology) exposed to a biopolymer
and iron nanoparticles precipitated during the reduction of
simple iron salts. The resulting nanoparticles were characterized
by X-ray powder diffraction (XRD) analysis, scanning electron
microscopy (SEM), and FTIR spectroscopy. XRD analysis of the
iron nanoparticles and nanocomposite powder was conducted
on a Panalytical Empyrean X-ray diffractometer (–2, CuK1+2
radiation, =1.54184 Å). The XRD pattern of Fe nanoparticles
with the diffraction peak at 2θ=44.8° was recorded. The avarage
particle size, which was calculated by the Debye–Scherrer
formula was 4 nm. The observed diffraction peaks at 2 =35.81,
41.2 4, 44.81, 46.05, 54.80 and 63.04º were attributed to
both bentonite and iron nanoparticles. The ecotoxicity of the
nanocomposite was studied onmicroorganisms
Alternaria sp
., 4D
and P.viride. The results confirm that Fe(0) nanoparticles can act
as both stimulators and inhibitors of growth of micellar fungi. The
stimulating effect of Fe(0) nanoparticles was observed in three
of the five strains of micromycetes namely 1LD, 5D and 8D. The
growth of strains
Alternaria sp
., 4D and P.viride was significantly
maintained in the presence of the nanocomposite (AI of 26.88%
and 13.91% respectively). At the same time Fe(0) nanoparticles in
common with magnetite Fe3O4 nanoparticles have a stimulating
effect on the formationandmaturationof spores inmicromycetes.
Thus, the proposed nanocomposite provides a decrease in the
toxic effect on the soil micro society while maintaining the ability
to degrade some POPs, such as DDT, DDD, and DDE.
anatoli.sidorenko@kit.eduNanocomposite for soils remediation based on
iron nanoparticles with biopolymer on bentonite
Anatolie Sidorenko, Inna Rastimesina
and
Tatiana Gutul
Institute of Electronic Engineering and Nanotechnologies ‘D.Ghitu’, Moldova