Research Square (Research Square),
Год журнала:
2022,
Номер
unknown
Опубликована: Июнь 13, 2022
Abstract
In
the
present
study,
modified
Fe
3
O
4
nanoparticles
were
fabricated
by
surface
coating
with
tryptophan
and
Iridium
co-precipitation
method
to
afford
@trp@Ir
magnetic
nanoparticles.
As-prepared
are
environmentally
benign
efficient
catalysts
for
reducing
organic
pollutants
such
as
4-nitrophenol
(4-NP),
4-nitroaniline
(4-NA),
1-bromo-4-nitrobenzene
(1-B-4-NB).
The
key
parameters
that
affect
catalytic
activity
like
temperature,
catalyst
loading,
concentration
of
agent
NaBH
optimized.
obtained
results
proved
is
an
nitroaromatics
at
ambient
temperature
a
minimal
loading
0.0025%.
complete
conversion
4-aminophenol
took
only
20
seconds
0.0025%
rate
constant
0.0522
s
−
1
.
high
factor
(1.040
mg
)
turnover
frequency
(9
min
nanocatalyst
highlight
possible
synergistic
effect
two
metals
(Fe
Ir).
visible-light
photocatalytic
degradation
4-NP
was
also
investigated
in
presence
@trp@Ir.
completed
95.15%
efficiency,
photodegradation
(0.1507
about
twice
dark
(0.0755
).
recycled
reused
five
cycles
without
significant
reduction
efficiency
catalyst.
Scientific Reports,
Год журнала:
2022,
Номер
12(1)
Опубликована: Июль 5, 2022
Abstract
Photoreduction
of
CO
2
with
sunlight
to
produce
solar
fuels,
also
named
artificial
photosynthesis,
is
considered
one
the
most
attractive
strategies
face
challenge
reducing
greenhouse
gases
and
achieving
climate
neutrality.
Following
an
approach
in
line
principles
circular
economy,
low-cost
catalytic
system
(
1
)
based
on
industrial
by-product
such
as
steel
slag
was
assessed,
which
properly
modified
nanostructured
palladium
its
surface
order
make
it
capable
promoting
conversion
into
methanol
hydrogen
through
a
two-stage
process
photoreduction
thermal
having
formic
acid
intermediate.
Notably,
for
first
time
literature
used
catalyst.
Journal of Applied Polymer Science,
Год журнала:
2022,
Номер
140(1)
Опубликована: Ноя. 2, 2022
Abstract
Azo
dyes
effluent
can
cause
severe
and
chronic
effects
to
living
organisms
since
they
are
toxic,
carcinogenic,
mutagenic.
They
color
water,
reduce
dissolved
oxygen,
block
light
penetration,
decrease
the
rate
of
photosynthesis
adversely
affect
whole
aquatic
biota.
Catalysis
is
one
methods
used
in
degrading
azo
less
harmful
species.
Catalytic
palladium
nanoparticles
(Pd
NPs)
effective
degradation
owing
their
large
surface
area
unique
electronic
properties.
However,
costly,
unstable
easily
aggregate;
hence,
a
substrate
necessary
enhance
stability,
reusability,
durability,
catalytic
efficiency,
cost
effectiveness.
Herein,
Pd
NPs
were
in‐situ
synthesized
immobilized
beta
cyclodextrin
(β‐CD)
modified
polyvinylidene‐fluoride
(PVDF)
membranes.
The
fabricated
membranes
characterized
using
different
techniques.
slightly
improved
properties
performance
A
complete
methyl
orange
dye
was
carried
out
within
20
min
presence
sodium
borohydride
increase
NP
content
increased
degradation.
recycled
reused
five
times
with
no
considerable
loss
performance.
Therefore,
PVDF/β‐CD‐Pd
proved
be
self‐cleaning,
reusable,
efficient
removal
from
water.
Nanomaterials,
Год журнала:
2022,
Номер
12(24), С. 4452 - 4452
Опубликована: Дек. 15, 2022
Nanotechnology
offers
unlimited
possibilities
for
creating
effective
hybrid
materials,
which
combine
functional
performance
in
environment
depollution
and
antimicrobial
defense
with
a
lack
of
toxicity,
biocompatibility,
biodegradability,
natural
availability.
This
paper
presents
the
silver
effect
on
photocatalytic
antibacterial
activities
double-coated
iron
oxide
nanoparticles
(NPs),
Fe3O4@SiO2/ZnO-Ag.
The
structural,
morphological,
textural
information
the,
core-shell
oxides-based
superparamagnetic
(IOMNPs)
decorated
5%
Ag
by
ultrasound-assisted
synthesis
were
evaluated
scanning
electron
microscopy
energy
dispersive
spectroscopy
(SEM-EDX),
X-ray
diffraction,
Raman
spectroscopy,
Brunauer-Emmett-Teller
physisorption
measurements.
Although
two
temperatures
95
80
°C
used
co-precipitated
cores,
XRD
patterns
revealed
formation
single
magnetite,
Fe3O4,
phase.
sorption-photocatalytic
under
dark
UV
irradiation
encountered
maximum
removal
efficiency
MB
(90.47%)
Fe3O4@SiO2/ZnO-Ag
sample
core
obtained
at
°C.
rate
constant
second-order
kinetics
was
0.0711
min-1
2
h,
correlation
coefficient
R2
closed
to
unity.
Two
samples
Ag-decorated
SiO2/ZnO
shell
hierarchically
interconnected
porous
structure
large
surface
area
(328.8
342.5
m2g-1)
exhibited
best
disk
diffusion
activity
against
four
microorganisms,
especially
gram-positive
Staphylococcus
aureus.
Research Square (Research Square),
Год журнала:
2022,
Номер
unknown
Опубликована: Июнь 13, 2022
Abstract
In
the
present
study,
modified
Fe
3
O
4
nanoparticles
were
fabricated
by
surface
coating
with
tryptophan
and
Iridium
co-precipitation
method
to
afford
@trp@Ir
magnetic
nanoparticles.
As-prepared
are
environmentally
benign
efficient
catalysts
for
reducing
organic
pollutants
such
as
4-nitrophenol
(4-NP),
4-nitroaniline
(4-NA),
1-bromo-4-nitrobenzene
(1-B-4-NB).
The
key
parameters
that
affect
catalytic
activity
like
temperature,
catalyst
loading,
concentration
of
agent
NaBH
optimized.
obtained
results
proved
is
an
nitroaromatics
at
ambient
temperature
a
minimal
loading
0.0025%.
complete
conversion
4-aminophenol
took
only
20
seconds
0.0025%
rate
constant
0.0522
s
−
1
.
high
factor
(1.040
mg
)
turnover
frequency
(9
min
nanocatalyst
highlight
possible
synergistic
effect
two
metals
(Fe
Ir).
visible-light
photocatalytic
degradation
4-NP
was
also
investigated
in
presence
@trp@Ir.
completed
95.15%
efficiency,
photodegradation
(0.1507
about
twice
dark
(0.0755
).
recycled
reused
five
cycles
without
significant
reduction
efficiency
catalyst.
