Magnetic sponge will help fight oil spills

American
the materials scientists have turned
a conventional polyurethane sponge material
for collecting oil from
the surface of the water.
Thanks
hydrophobic and lipophilic coating
these sponges effectively absorb oil
and the addition of magnetic particles will help
to reduce the viscosity of the collected oil to regenerate. Results
research published
in the journal Industrial
& Engineering Chemistry Research.

DLa
elimination of oil spills
in
reservoirs there are four approaches:
the burning of oil on
the surface of the water,
pumping
oil-water emulsion pumps
use
dispersants
to break the oil film on
the surface and the subsequent absorption
oil drops microorganisms
and
collection
using
solid sorbents.
Last
the method is preferable as
environmental and economic
point of view. First, the oil is removed
ecosystem forever, and not converted,
for example, in carbon dioxide
or not going to eat living organisms. Second, the part thus derived
oil can be regenerated.

American
material engineers
under the leadership of Vinayaka Dravida
(Vinayak
P. Dravid)
northwestern University
developed
new
the sorbent with
lipophilic,
hydrophobic
and magnetic
properties.
For
took commercially available
sponge made of polyurethane with
porosity of about 95 percent
and
covered them
carbon nanocomposite with
nanoparticles
magnetite
Fe3O4
and
magnetite, doped with manganese
MnFe2O4.

Composite
graphite nanoparticles synthesized
using ultrasound: in the previous
the work of a group of Dravida was shown,
that way you can interkaliruet
magnetite nanoparticles between graphite
layers. Below
apply the composite on a porous sponge,
pieces
the sponge is first dipped into water and then
placed in a suspension of graphite
with nanoparticles
and again
processed
ultrasound for ten minutes.

After ultrasonic treatment of the sponge
left in suspension for a further hour, then
was washed with water and dried at a temperature of
60 degrees Celsius for one hour. After
this treatment is formed
a stable coating of the nanocomposite on
the surface of the sponge.
Structure
composite was confirmed by the method
electron diffraction in selected
region, and
energy dispersive
spectroscopy showed
his
particles
uniformly distributed throughout the
the surface of the polyurethane
sponge.

Graphite
the coating makes the sponge hydrophobic and
lipophilic.
They
bad
wetted
water and aqueous solutions (contact
an angle of about
120 degrees, varies slightly in
depending on the acidity of the solution),
at that time oil was
fixed
very
a good wetting with
almost zero contact angle. The authors
note that in
need
the hydrophobicity of the jaws can be further increased by
adding
in impregnating
suspension more
graphene.

Thanks
the combination of hydrophobicity and oleifolius
when immersed in a mixture of water with nonpolar
liquid, a sponge and absorbs
exclusively
non-polar liquid. Thanks
the high porosity of the material
maybe
to absorb the weight of the fluid that greatly exceeds the
own weight:
for example,
about
18
grams
hexane and
26
grams
engine oil per one gram.
The amount of absorbed oil
is determined by the density and
viscosity
for example,
in
case
Texas
oil managed to collect 19
grams
per gram of the sponge, and
in
the case is heavy
and
viscous
Azerbaijan — about 32
grams.
Sponge
effectively
absorb oil from the surface
alkaline and
sour
solutions
solutions
salts that
it is important to gather
oil from the surface of seas and salt
lakes.
Sponge
you can use many times after
ten cycles they
retained more than 90 percent of its
the initial efficiency.

Leave a Reply

Your email address will not be published.