Chemical Physics Impact,
Journal Year:
2024,
Volume and Issue:
8, P. 100632 - 100632
Published: May 8, 2024
The
present
study
explored
Muntingia
calabura
leaf
extract
as
a
reducing
and
capping
agent
for
synthesis
of
Ag-doped
CuO
nanoparticles
embedded
reduced
graphene
oxide
(rGO)
nanocomposite.
crystalline
nature
the
Ag
doped
CuO/rGO
was
identified
utilizing
X-ray
diffraction
(XRD)
analysis.
surface
morphology
investigated
by
Scanning
electron
microscope
(SEM)
transmission
(TEM)
elemental
composition
prepared
material
Energy
dispersive
spectra
(EDS)
resulted
in
enhanced
absorbance
visible
range
well
reduction
band
gap
energy.
catalytic
activity
green
synthesized
photocataltyst
evaluated
organic
pollutants
such
4-nitrophenol
(4-NP)
methylene
blue
(MB)
water
at
mild
conditions.
results
indicated
that
biosynthesized
Ag-CuO/rGO
composites
have
very
high
effective
over
MB
dye
(99.5%),
rate
constant
(0.9871
min−1)
long
term
stability
with
60
min
irradiation
UV
light.
In
addition,
initial
process
parameters
catalyst
dosage
concentration,
pH
solution
were
also
examined.
Differential
antimicrobial
effects
undoped
(NPs)
against
selected
strains
bacteria
fungi
confirmed.
Carbon Resources Conversion,
Journal Year:
2024,
Volume and Issue:
7(4), P. 100235 - 100235
Published: March 5, 2024
We
report
magnetically-separable,
reusable,
green-synthesized
Fe3O4/rGO/ZnO,
as
heterogeneous
catalyst
for
photo-Fenton
degradation
of
organic
pollutants
in
aqueous
solution
under
certain
treatments.
Fe3O4
nanoparticles
was
using
Moringa
oleifera
leaf
extract,
while
rGO
synthesized
utilizing
Amaranthus
viridis
extract.
Fe3O4/rGO
composited
sonication
treatment.
Afterwards,
doped
with
ZnO
various
concentration
ZnO.
X-ray
diffraction
and
selected
area
electron
showed
that
had
spinel
cubic
hexagonal
structure,
respectively;
another
phase
appeared
Fe2O3
structure.
Crystallite
size
decreased
the
increased.
Morphology
image
almost
spherical,
non-uniform,
slightly
dispersed
particle
agglomerated
condition,
attaching
to
sheets.
The
Fe3O4,
Fe3O4/rGO,
Fe3O4/rGO/ZnO
is
14.3;
14.1;
10.4
nm,
respectively.
Fourier-transform
infrared
spectra
metallic
functional
groups,
such
Fe-O
Zn–O
at
562–589
462–478
cm−1
also
suggests
nanocomposite
formation.
However,
blue-shift
absorption
band
gap
widening
were
observed
addition.
Raman
spectroscopy
revealed
formation
as-synthesized
GO
rGO.
Vibrating
sample
magnetometer
exhibited
superparamagnetic
properties.
Removal
efficiency
photodegradation
methylene
blue
optimal
treatment,
reached
100
%
within
180
min
uptake
every
30
min.
Photodegradation
analyzed
Langmuir-Hinshelwood
kinetic
model,
resulting
rate
constant
24.7
×
10−3
min−1
half-life
time
28.1
optimum
Reusability
photocatalytic
activity
after
3
cycles
only
a
tiny
drop
catalytic
efficiency.
Meanwhile,
it
possesses
high
stability
potential
an
environmentally
friendly
reusable
photocatalyst
wastewater
degradation.
