Nanomaterials,
Год журнала:
2024,
Номер
14(6), С. 522 - 522
Опубликована: Март 14, 2024
Carbon
nanomaterials
are
promising
adsorbents
for
dye
removal
from
wastewater
also
due
to
their
possible
surface
functionalization
that,
in
principle,
can
increase
the
adsorption
rate
and
provide
regeneration.
To
investigate
real
advantages
of
functionalization,
we
synthesized
characterized
through
IR,
TGA,
TEM,
XPS
DLS
measurements
a
multi-walled
carbon
nanotube
(MWCNT)
derivative
bearing
benzenesulfonate
groups
(MWCNT-S).
The
obtained
material
demonstrated
have
good
dispersibility
water
better
capability
adsorb
methylene
blue
(MB)
compared
pristine
MWCNT
adsorbent.
Adsorption
kinetic
studies
showed
very
fast
process,
with
constant
significantly
higher
respect
not
only
that
unfunctionalized
adsorbent
but
those
widely
used
activated
carbons.
Moreover,
capacity
MWCNT-S
is
more
than
doubled
insoluble
adsorbent,
thanks
derivatives,
providing
larger
available
surface,
electrostatic
interactions
between
cationic
MB
anionic
sulfonate
groups.
Additionally,
reversibility
ionic
disclosed
possibility
release
adsorbed
pollutant
competition
salts,
regenerating
recovering
dye.
Indeed,
by
treating
1
h
M
NaCl,
regeneration
75%
was
obtained,
demonstrating
validity
this
strategy.
Applied Sciences,
Год журнала:
2021,
Номер
11(14), С. 6255 - 6255
Опубликована: Июль 6, 2021
Natural
dyes
have
been
used
from
ancient
times
for
multiple
purposes,
most
importantly
in
the
field
of
textile
dying.
The
increasing
demand
and
excessive
costs
natural
dye
extraction
engendered
discovery
synthetic
petrochemical
compounds.
Nowadays,
they
are
dominating
market,
with
nearly
8
×
105
tons
produced
per
year
due
to
their
wide
range
color
pigments
consistent
coloration.
Textile
industries
consume
huge
amounts
water
dyeing
processes,
making
it
hard
treat
enormous
quantities
this
hazardous
wastewater.
Thus,
harmful
impacts
when
discharged
non-treated
or
partially
treated
forms
environment
(air,
soil,
plants
water),
causing
several
human
diseases.
In
present
work
we
focused
on
dyes.
We
started
by
studying
classification
which
depended
nature
manufactured
fiber
(cellulose,
protein
dyes).
Then,
mentioned
characteristics
dyes,
however,
more
negative
ecosystem
(soil,
plants,
air)
humans.
Lastly,
discussed
applied
physical,
chemical
biological
strategies
solely
combination
wastewater
treatments.
Additionally,
described
newly
established
nanotechnology
achieves
complete
discharge
decontamination.
Molecules,
Год журнала:
2021,
Номер
26(17), С. 5419 - 5419
Опубликована: Сен. 6, 2021
The
primary,
most
obvious
parameter
indicating
water
quality
is
the
color
of
water.
Not
only
can
it
be
aesthetically
disturbing,
but
also
an
indicator
contamination.
Clean,
high-quality
a
valuable,
essential
asset.
Of
available
technologies
for
removing
dyes,
adsorption
used
method
due
to
its
ease
use,
cost-effectiveness,
and
high
efficiency.
process
influenced
by
several
parameters,
which
are
basis
all
laboratories
researching
optimum
conditions.
main
objective
this
review
provide
up-to-date
information
on
studied
influencing
factors.
effects
initial
dye
concentration,
pH,
adsorbent
dosage,
particle
size
temperature
illustrated
through
examples
from
last
five
years
(2017-2021)
research.
Moreover,
general
trends
drawn
based
these
findings.
removal
time
ranged
5
min
36
h
(E
=
100%
was
achieved
within
5-60
min).
In
addition,
nearly
80%
efficiency
with
just
0.05
g
adsorbent.
It
important
reduce
(with
Φ
decrease
E
8-99%).
Among
dyes
analyzed
in
paper,
Methylene
Blue,
Congo
Red,
Malachite
Green,
Crystal
Violet
were
frequently
studied.
Our
conclusions
previously
published
literature.
Membranes,
Год журнала:
2021,
Номер
11(7), С. 468 - 468
Опубликована: Июнь 25, 2021
In
this
study,
silver/silver
oxide
nanoparticles
(Ag/Ag2O
NPs)
were
successfully
biosynthesized
using
Phoenix
dactylifera
L.
aqueous
leaves
extract.
The
effect
of
different
plant
extract/precursor
contractions
(volume
ratio,
v/v%)
on
Ag/Ag2O
NP
formation,
their
optical
properties,
and
photocatalytic
activity
towards
azo
dye
degradation,
i.e.,
Congo
red
(CR)
methylene
blue
(MB),
investigated.
X-ray
diffraction
confirmed
the
crystalline
nature
NPs
with
a
crystallite
size
range
from
28
to
39
nm.
Scanning
electron
microscope
images
showed
that
have
an
oval
spherical
shape.
UV–vis
spectroscopy
direct
bandgap
2.07–2.86
eV
indirect
1.60–1.76
eV.
Fourier
transform
infrared
analysis
suggests
synthesized
might
be
stabilized
through
interactions
-OH
C=O
groups
in
carbohydrates,
flavonoids,
tannins,
phenolic
acids
present
Interestingly,
prepared
high
catalytic
degradation
for
CR
dye.
was
monitored
spectrophotometrically
wavelength
250–900
nm,
decolorization
efficiency
(84.50%)
obtained
after
50
min
reaction.
As
result,
use
extract
offers
cost-effective
eco-friendly
method.
