Applied Sciences,
Journal Year:
2023,
Volume and Issue:
13(21), P. 11857 - 11857
Published: Oct. 30, 2023
The
presence
of
Methyl
Orange,
a
hazardous
organic
compound
typically
found
in
industrial
wastewater,
presents
significant
environmental
challenge,
necessitating
the
development
effective
strategies
for
its
removal
to
mitigate
adverse
impacts
on
aquatic
ecosystems
and
human
health.
In
this
work,
we
utilized
60-watt
continuous-wave
(CW)
high-power
CO2
laser
with
10.6
μm
wavelength
synthesize
Zinc
Oxide
nanoparticles
(ZnO
NPs)
doped
1%
Cerium
(Ce)
as
photocatalyst
at
standard
laboratory
conditions
through
Laser-Assisted
Chemical
Bath
Synthesis
(LACBS)
technique.
synthesized
nanostructures
were
thoroughly
characterized
using
UV–vis
spectroscopy,
field-emission
scanning
electron
microscopy
(FESEM),
X-ray
diffraction
(XRD)
techniques.
Subsequently,
their
efficiency
degrading
Orange
(MO)
dye
was
evaluated
under
UV
sunlight
irradiation.
findings
revealed
that
Ce-doped
ZnO
sample
exhibited
enhanced
photocatalytic
both
irradiation,
well
active
adsorption
capabilities
absence
light.
Notably,
most
photodegradation
performance
achieved
solar
radiation,
an
impressive
95%
MO
degradation
observed
after
just
90
min
exposure.
Molecules,
Journal Year:
2023,
Volume and Issue:
28(23), P. 7772 - 7772
Published: Nov. 25, 2023
This
work
adopted
a
green
synthesis
route
using
cashew
tree
gum
as
mediating
agent
to
obtain
Ni-doped
ZnO
nanoparticles
through
the
sol–gel
method.
Structural
analysis
confirmed
formation
of
hexagonal
wurtzite
phase
and
distortions
in
crystal
lattice
due
inclusion
Ni
cations,
which
increased
average
crystallite
size
from
61.9
nm
81.6
nm.
These
resulted
growth
point
defects
structure,
influenced
samples’
optical
properties,
causing
slight
reductions
band
gaps
significant
increases
Urbach
energy.
The
fitting
photoluminescence
spectra
an
increase
concentration
zinc
vacancy
(VZn)
monovacancies
(Vo)
Zn
cations
were
replaced
by
structure.
percentage
VZn
for
pure
compound
was
11%,
increasing
40%
47%
samples
doped
with
1%
3%
respectively.
In
contrast,
highest
VO
is
recorded
material
lowest
ions
concentration,
comprising
about
60%.
influence
dopant
also
reflected
photocatalytic
performance.
Among
tested,
Zn0.99Ni0.01O
presented
best
result
MB
degradation,
reaching
efficiency
98.4%.
Thus,
recovered
underwent
reuse
tests,
revealing
98.2%
dye
confirming
stability
photocatalyst.
Furthermore,
use
different
inhibitors
indicated
that
•OH
radicals
are
main
ones
involved
removing
pollutant.
valuable
because
it
presents
ecological
gum,
natural
polysaccharide
has
been
little
explored
literature.
Sustainability,
Journal Year:
2024,
Volume and Issue:
16(20), P. 8758 - 8758
Published: Oct. 10, 2024
The
development
of
efficient
photocatalysts
is
crucial
in
addressing
water
pollution
concerns,
specifically
the
removal
organic
dyes
from
wastewater.
In
this
context,
use
silver
nanoparticles
(Ag
NPs)
might
represent
a
method
to
achieve
high
dye
degradation
efficiencies.
On
other
hand,
classical
Ag
NP
production
process
involves
several
reactants
and
operating
conditions,
which
make
it
poorly
sustainable.
present
work,
NPs
were
synthesized
according
new
sustainable
involving
natural
extracts
Spirulina
platensis
milder
conditions.
material
was
also
calcined
determine
influence
content
on
properties
NPs.
X-ray
diffraction
(XRD)
analysis
displayed
AgCl
phases
with
crystalline
size
11.79
nm
before
calcination.
After
calcination,
only
phase
an
increased
24.60
nm.
Fourier
Transform
Infrared
Spectroscopy
(FTIR)
confirmed
capping
role
metabolites
extract.
Scanning
Electron
Microscopy
(SEM)
Transmission
(TEM)
revealed
spherical
or
quasi-spherical
morphologies
agglomeration
due
Energy-dispersive
spectroscopy
(EDX)
Thermogravimetric
(TGA)
analyses
further
involvement
synthesis
optical
changes
products
observed
UV-Vis
analysis.
tested
for
their
photocatalytic
activity
against
laboratory
brilliant
blue
r
visible
light
various
highest
efficiency
81.9%,
kapp
value
0.00595
min−1,
alkaline
medium
after
90
min
irradiation.
