Ecotoxicology and Environmental Safety,
Journal Year:
2024,
Volume and Issue:
281, P. 116608 - 116608
Published: June 19, 2024
Water
pollution
caused
by
heavy
metals
is
a
major
environmental
problem,
threatening
water
production,
food
safety,
and
human
health.
Cadmium
(Cd)
particularly
serious
because
of
food-chain
biomagnification
at
toxic
concentrations.
Modified
biochar
promising
for
metal
removal;
however,
efficient
adsorbents
Cd
removal
are
lacking.
In
the
present
study,
novel
adsorbent,
silica
gel-modified
(SGB),
was
prepared
applied
to
treat
sewage
polluted
Cd.
Through
batch
adsorption
experiments,
it
known
that
SGB
possessed
outstanding
ability
recycleability.
Furthermore,
behavior
mechanisms
were
analyzed
application
kinetic
isotherm
models.
The
maximum
Cd2+
capacity
38.08
mg
g−1,
after
five
recycling
processes,
rate
still
86.89
%.
When
pH
solution
7.0,
showed
strongest
(29.06
g−1).
competitive
ions
existed,
also
had
high
efficiency,
although
effect
Pb2+
greater
than
those
Cu2+
Zn2+,
indicating
applicable
complex
water.
Additionally,
main
electrostatic
interactions,
π-π
complexation,
co-precipitation.
These
results
can
effectively
Cd-contaminated
wastewater
as
new
adsorbent.
Journal of Inorganic and Organometallic Polymers and Materials,
Journal Year:
2023,
Volume and Issue:
33(7), P. 1855 - 1867
Published: April 1, 2023
Abstract
In
this
work,
zinc
oxide
(ZnO)
was
produced
using
extracts
of
Thymus
(Z),
Hibiscus
rosa-sinensis
(K),
and
Daucus
carota
(G).
Furthermore,
sodium
carboxymethyl
cellulose
(CMC)
polyvinyl
alcohol
(PVA)
were
combined
with
ZnO
to
form
three
novel
nanocomposites.
X-ray
diffraction
(XRD)
used
for
the
structural
analysis,
where
semicrystalline
nature
(CMC/PVA)/ZnO
nanocomposites
confirmed.
The
characteristics
functional
groups
that
arose
inside
prepared
samples
identified
by
Fourier
transform
infrared
spectroscopy
(FTIR).
Evidence
successful
preparation
pure
particles
their
carried
out
a
transmission
electron
microscope
(TEM).
nanoparticles
are
mostly
spherical,
irregularly
distributed,
have
radii
ranging
from
10
40
nm.
Their
anti-bacterial
activity
studied
against
B.
subtilis
,
E.
coli,
Candida
albicans
.
inhibition
zones
all
coli
0,
19,
31,
23
mm
PVA/CMC
blend,
PVA/CMC/ZnO
(Z)
(PCZ-Z),
(K)
(PCZ-K),
(G)
(PCZ-G),
respectively,
compared
streptomycin
control
Gram-positive
standard
zone
(34
mm).
On
other
hand,
equal
26,
33,
28
CMC/PVA,
PCZ-Z,
PCZ-K,
PCZ-G,
respectively.
Based
on
these
results,
PCZ-K
sample
is
most
effective
at
resisting
(91.17%)
(94.28%).
These
do
not
harmful
chemicals,
making
them
strong
candidates
use
in
biological
applications.
Scientific Reports,
Journal Year:
2023,
Volume and Issue:
13(1)
Published: Dec. 14, 2023
Abstract
Industrial
chemical
pollutants
such
as
methylene
blue
(MB)
dye
are
released
into
the
water
body
and
potentially
cause
harm
to
human
aquatic
biosphere.
Therefore,
this
study
aims
synthesize
eco-friendly
nanocatalysts,
i.e.,
reduced
graphene
oxide
(rGO),
zinc
(ZnO),
oxide-zinc
(rGO@ZnO)
nanocomposites,
for
efficient
photocatalytic
degradation
of
MB
dye.
A
graphite
rod
was
obtained
from
waste
dry
cell
batteries
electrochemical
exfoliation
synthesis
(GO)
rGO.
For
ZnO
rGO@ZnO
Croton
macrostachyus
leaf
extract
used
a
reducing
capping
agent.
The
synthesized
nanocatalysts
were
characterized
using
UV–Vis
spectrophotometer,
Fourier
transform
infrared
spectroscopy,
X-ray
diffraction,
scanning
electron
microscopy
with
energy-dispersive
X-ray.
rGO,
ZnO,
applied
direct
sunlight
irradiation.
At
optimum
parameters,
efficiency
reached
up
66%,
96.5%,
99.0%,
respectively.
Furthermore,
kinetics
photodegradation
reaction
based
on
follow
pseudo-first-order
rate
constant
2.16
×
10
–3
min
−1
,
4.97
−3
5.03
Lastly,
promotes
low
catalyst
load
(20
mg)
Nano Materials Science,
Journal Year:
2023,
Volume and Issue:
6(3), P. 355 - 364
Published: Nov. 29, 2023
This
research
investigates
the
hydrothermal
synthesis
and
annealing
duration
effects
on
nickel
sulfide
(NiS2)
quantum
dots
(QDs)
for
catalytic
decolorization
of
methylene
blue
(MB)
dye
antimicrobial
efficacy.
QD
size
increased
with
longer
annealing,
reducing
activity.
UV–vis,
XRD,
TEM,
FTIR
analyses
probed
optical,
structural,
morphological,
vibrational
features.
XRD
confirmed
NiS2's
anorthic
structure,
crystallite
growing
from
6.53
to
7.81
nm
during
extended
annealing.
UV–Vis
exhibited
a
bathochromic
shift,
reflecting
reduced
band
gap
energy
(Eg)
in
NiS2.
TEM
revealed
NiS2
formation,
agglomerated
average
increasing
7.13
9.65
prolonged
Pure
showed
significant
MB
(89.85%)
acidic
conditions.
Annealed
QDs
demonstrated
notable
antibacterial
activity,
yielding
6.15
mm
inhibition
zone
against
Escherichia
coli
(E.
coli)
compared
Ciprofloxacin.
First-principles
computations
supported
robust
interaction
between
NiS2,
evidenced
by
obtained
adsorption
energies.
study
highlights
nuanced
relationship
duration,
structural
changes,
functional
properties
QDs,
emphasizing
their
potential
applications
catalysis
interventions.
Scientific Reports,
Journal Year:
2023,
Volume and Issue:
13(1)
Published: April 1, 2023
In
this
study,
CoFe2O4
nanoparticles
were
prepared
by
the
co-precipitation
method
then
surface
modified
with
Capsaicin
(Capsicum
annuum
ssp.).
The
virgin
NPs
and
Capsaicin-coated
(CPCF
NPs)
characterized
XRD,
FTIR,
SEM,
TEM.
antimicrobial
potential
photocatalytic
degradation
efficiencies
of
samples
via
Fuchsine
basic
(FB)
investigated.
results
revealed
that
have
spherical
shapes
their
diameter
varied
from
18.0
to
30.0
nm
an
average
particle
size
25.0
nm.
Antimicrobial
activity
was
tested
on
Gram-positive
(S.
aureusATCC
52923)
Gram-negative
(E.
coli
ATCC
52922)
disk
diffusion
broth
dilution
methods
determine
zone
inhibition
(ZOI)
minimum
inhibitory
concentration
(MIC),
respectively.
UV-assisted
FB
examined.
Various
parameters
affecting
efficiency
such
as
pH,
initial
FB,
dose
nanocatalyst
studied.
in-vitro
ZOI
MIC
verified
CPCF
more
active
upon
Gram-Positive
S.
aureus
52923
(23.0
mm
0.625
μg/ml
MIC)
than
Gram-Negative
E.
52922
(17.0
1.250
MIC).
Results
obtained
indicated
maximum
removal
achieving
94.6%
in
equilibrium
observed
using
20.0
mg
NPS
at
pH
9.0.
synthesized
effective
also
potent
agent
against
both
bacteria
medical
environmental
applications.
Micromachines,
Journal Year:
2024,
Volume and Issue:
15(7), P. 849 - 849
Published: June 29, 2024
Transition
metal
sulfides
are
widely
used
in
supercapacitor
electrode
materials
and
exhibit
excellent
performance
because
of
their
rich
variety,
low
price,
high
theoretical
specific
capacity.
At
present,
the
main
methods
to
prepare
transition
include
hydrothermal
method
electrochemical
method.
In
order
further
improve
performance,
two
aspects
can
be
addressed.
Firstly,
by
controllable
synthesis
nanomaterials,
porous
structures
large
surface
areas
achieved,
thereby
improving
ion
transport
efficiency.
Secondly,
combining
with
other
energy
storage
materials,
such
as
carbon
oxides,
synergy
between
different
fully
utilized.
However,
future
research
still
needs
address
some
challenges.
guide
in-depth
research,
it
is
necessary
combine
current
research-derived
knowledge
propose
a
direction
for
development
sulfide
materials.
