Ultrasonics Sonochemistry,
Journal Year:
2024,
Volume and Issue:
103, P. 106792 - 106792
Published: Feb. 1, 2024
Methylene
blue
is
one
of
the
most
common
pollutants
found
in
wastewater,
primarily
due
to
its
widespread
use
dye
industry.
Consequently,
it
imperative
explore
environmentally
friendly
and
efficient
methods
for
degrading
this
pollutant
into
non-toxic
byproducts.
While
ultrasonic
degradation
combination
with
additives
or
catalysts
have
proven
effective,
added
may
inadvertently
contribute
secondary
pollution.
Moreover,
preparation
these
imposes
an
additional
burden
terms
effort
cost.
To
address
issues,
paper
introduces
a
catalyst-free
dual-frequency
ultrasound
approach
methylene
blue.
The
sonochemical
quality
cavitation
bubbles
improved
using
technique
because
bulk
solution
populated
two
types
bubbles,
whose
mean
sizes
are
determined
by
dual
frequencies.
findings
demonstrate
that,
under
identical
acoustic
power
density
conditions,
consistently
outperforms
single-frequency
modes
across
all
investigated
parameters.
Furthermore,
larger
difference
between
frequencies
used,
more
effective
Finally,
after
just
20
min
sonication,
efficiency
91
%
was
achieved
80
kHz
at
209.63
±
6.94
W/L.
offers
friendly,
catalyst-free,
highly
method
Journal of Hazardous Materials,
Journal Year:
2022,
Volume and Issue:
436, P. 129174 - 129174
Published: May 18, 2022
Hierarchically
porous
activated
Starbons®
derived
from
starch
are
found
to
make
excellent
adsorbents
for
methylene
blue,
even
in
the
presence
of
other
dyes
and
inorganic
salts,
highlighting
their
potential
be
used
water
purification.
The
optimal
material
(S950C90)
has
a
blue
adsorption
capacity
(891
mg
g-1)
almost
nine
times
higher
than
that
unactivated
S800
four
commercial
carbon
at
298
K.
onto
materials
(S950C90
S800K4)
reaches
equilibrium
within
5
min.
Adsorption
data
all
show
good
fit
Freundlich
isotherm
which
allows
Gibbs
free
energies
calculated.
capacities
increase
as
pH
solution
increases,
allowing
dye
desorbed
by
treatment
with
acidic
ethanol
Starbon®
reused.
Porosimetry
SEM-EDX
imaging
indicate
adsorbs
throughout
surface
completely
fills
micropores
adsorbent.
correlations
both
BET
areas
micropore
volumes
materials.
RSC Advances,
Journal Year:
2023,
Volume and Issue:
13(27), P. 18404 - 18442
Published: Jan. 1, 2023
Photocatalysis
is
a
more
proficient
technique
that
involves
the
breakdown
or
decomposition
of
different
organic
contaminants,
various
dyes,
and
harmful
viruses
fungi
using
UV
visible
light
solar
spectrum.
Metal
oxides
are
considered
promising
candidate
photocatalysts
owing
to
their
low
cost,
efficiency,
simple
fabricating
method,
sufficient
availability,
environment-friendliness
for
photocatalytic
applications.
Among
metal
oxides,
TiO
Heliyon,
Journal Year:
2023,
Volume and Issue:
9(2), P. e13484 - e13484
Published: Feb. 1, 2023
In
the
present
work,
copper
oxide
(CuO
NPs)
was
synthesized
by
an
eco-friendly,
simple,
low-cost,
and
economical
synthesis
method
using
Ephedra
Alata
aqueous
plant
extract
as
a
reducing
capping
agent.
The
biosynthesized
CuO-NPs
were
compared
with
chemically
obtained
to
investigate
effect
of
preparation
on
structural,
optical,
morphological,
antibacterial,
antifungal,
photocatalytic
properties
under
solar
irradiation.
CuO
NPs
characterized
X-ray
diffraction
(XRD),
UV-VIS
spectroscopy,
Fourier
transform
infrared
spectrometer
(FTIR)
analysis,
field
emission
scanning
electron
microscopy
energy
dispersive
spectroscopy
(FESEM-EDX).
activities
biosynthetic
prepared
studied
methylene
blue
upon
exposure
results
showed
that
photocatalyst
more
efficient
than
for
Methylene
Blue
(MB)
degradation
irradiation,
MB
rates
93.4%
80.2%,
respectively.
addition,
antibacterial
antifungal
evaluated.
disk
diffusion
technique
used
test
against
gram-negative
bacteria,
Staphylococcus
aureus
Bacillus
subtilis,
well
C.
Albicans
S.
cerevisiae.
activity.
revealed
can
play
vital
role
in
destruction
pathogenic
dyes,
activity
agents
bioremediation
industrial
domestic
waste.
Water,
Journal Year:
2023,
Volume and Issue:
15(3), P. 384 - 384
Published: Jan. 17, 2023
Removing
organic
pollutants,
textile
dyes,
and
pharmaceutical
wastes
from
the
water
bodies
has
become
an
essential
requirement
for
a
safe
environment.
Therefore,
present
study
aimed
to
prepare
semiconductor
zinc
oxide
nanoparticles
(ZnO
NPs)
plasmonic
Ag-supported
ZnO
nanocomposite
(ZnO–Ag)
using
environmentally
friendly
bio-approach
as
alternative
hazardous
synthesis
approaches.
NPs
ZnO–Ag
were
characterized
by
UV–Vis
diffuse
reflectance
spectroscopy
(UV–DRS)
(the
exhibited
absorption
band
between
450–550
nm,
attributed
Ag
surface
plasmon
resonance
(SPR)),
Photoluminescence
(PL)
spectral
investigation,
which
revealed
PL
emission
intensity
of
was
lower
than
pure
NPs,
describing
extended
electron-hole
pair
(e--h+)
lifespan
photogenerated
charge
carriers,
Fourier
transform
infrared
(FTIR),
FT-Raman,
X-ray
diffraction
(XRD)
analyses
deduced.
In
addition,
energy
dispersive
(SEM-EDX),
transmission
electron
microscopy
(TEM),
thermogravimetric
analysis
(TGA)
performed
further
ascertained
successful
biosynthesis
thermally
stable
Nps
nanocomposite.
The
as-prepared
displayed
increased
photocatalytic
characteristics
due
decline
in
bandgap
3.02
eV
2.90
(ZnO–Ag
nanocomposite).
activity
developed
degradation
methylene
blue
(MB)
dye,
primary
industry
released
water-pollutant,
conducted
under
UV
light
irradiation.
Meanwhile,
maximum
%
MB
dye
molecules
attained
98.0
after
60
min
exposure
UV-light
Increased
nanocomposites
faster
rate
achieved
deposition
(SPR)
effect
possessed
NPs.
oxidative
route
that
resulted
production
hydroxyl
radicals
(OH•).
SPR
photocatalyst
induced
synergistic
enhancement
optical
response
separation
photo-induced
carriers.
combined
gives
comprehensive
information
directions
future
research
on
noble
metal-modified
nanocatalysts
direct
applications
water.
Water,
Journal Year:
2023,
Volume and Issue:
15(1), P. 175 - 175
Published: Jan. 1, 2023
Photodegradation
is
the
chemical
conversion
of
large,
toxic,
and
complex
molecules
into
non-toxic,
simpler,
lower
molecular
weight
species
due
to
light
exposure.
Heterogeneous
photocatalysis
has
sufficient
potential
degrade
toxic
organic
pollutants
present
in
wastewater.
As
industries
discharge
their
effluents
containing
natural
water
bodies,
which
penetrate
subsurface
through
connected
pores
it
necessary
study
this
process
or
tap
water.
Tap
(TW)
mainly
obtained
from
underground
wells
having
inorganic
salts
a
minute
quantity
with
conductivity
500
μS/cm.
TW
contains
anions,
affect
photocatalytic
activity
process.
The
aim
review
evaluate
effect
on
photo-degradation
such
as
dyes,
pharmaceutical
products,
pesticides,
etc.,
support
literature.
had
diverse
photodegradation
pollutants;
either
may
enhance
decrease
rate
pollutants’
photodegradation.
Journal of Functional Biomaterials,
Journal Year:
2023,
Volume and Issue:
14(4), P. 205 - 205
Published: April 7, 2023
The
peel
aqueous
extract
of
Punica
granatum
was
utilized
to
fabricate
zinc
oxide
nanoparticles
(ZnO-NPs)
as
a
green
approach.
synthesized
NPs
were
characterized
by
UV-Vis
spectroscopy,
Fourier
transform
infrared
(FT-IR),
X-ray
diffraction
(XRD),
transmission
electron
microscopy
(TEM),
and
scanning
microscopy,
which
attached
an
energy
dispersive
(SEM-EDX).
Spherical,
well
arranged,
crystallographic
structures
ZnO-NPs
formed
with
sizes
10-45
nm.
biological
activities
ZnO-NPs,
including
antimicrobial
catalytic
activity
for
methylene
blue
dye,
assessed.
Data
analysis
showed
that
the
against
pathogenic
Gram-positive
Gram-negative
bacteria,
unicellular
fungi,
observed
occur
in
dose-dependent
manner,
displaying
varied
inhibition
zones
low
minimum
inhibitory
concentration
(MIC)
values
ranges
6.25-12.5
µg
mL-1.
degradation
efficacy
(MB)
using
is
dependent
on
nano-catalyst
concentration,
contact
time,
incubation
condition
(UV-light
emission).
maximum
MB
percentages
93.4
±
0.2%
attained
at
20
mL-1
after
210
min
presence
UV-light.
there
no
significant
difference
between
210,
1440,
1800
min.
Moreover,
high
stability
degrade
five
cycles
decreasing
4%.
Overall,
P.
granatum-based
are
promising
tools
inhibit
growth
microbes
UV-light
emission.
Fuel Communications,
Journal Year:
2023,
Volume and Issue:
15, P. 100088 - 100088
Published: March 13, 2023
Crop
residues
are
a
major
component
of
lignocellulosic
biomass
waste
generated
from
the
agriculture
sector.
Improper
management
these
wastes
pollutes
environment,
contaminates
water
bodies,
and
constitutes
hazards
to
human
health.
The
conversion
crop
biochar
is
an
ecologically
benign
sustainable
strategy
for
management.
This
review
provides
novel
insight
into
techniques
converting
various
classes
such
as
straws,
peels,
bagasse,
husks,
shells,
cobs,
stubbles
biofuel
production.
updated
information
on
description,
benefits,
drawbacks
production
including
traditional,
modern,
also
surveyed.
study
concluded
effectiveness
derived
catalysts
or
support
biodiesel,
biohydrogen,
biomethane
deployment
residue
cost-effective,
eco-friendly,
contributes
environmental
sustainability.
More
multidisciplinary
investigations
required
harness
benefits
derivable
application
synthesis
confront
challenges
associated
with
generation
process
guarantee
intensification
use
innovative
technologies
should
be
encouraged
guide
future
research
toward
ensuring
cleaner,
ecological
utilization
