RSC Advances,
Journal Year:
2022,
Volume and Issue:
12(43), P. 27868 - 27876
Published: Jan. 1, 2022
Recently,
magnesium
molybdate
materials
have
attracted
scientific
attention
for
application
in
supercapacitor
devices
due
to
advantages
like
low
synthesis
cost
and
good
redox
reactions.
Nevertheless,
these
endure
electrical
conductivity
leading
inferior
electrochemical
performance.
To
eliminate
this
drawback,
we
prepare
a
composite
powder
containing
functionalized
carbon
nanotubes
(MMO/C)
using
simple
process
improve
the
supercapacitive
properties.
The
results
proved
an
electrostatic
interaction
between
two
components
of
powder,
which
contains
18-30
nm
nanoparticles.
A
crystal
model
related
(MMO)
was
simulated,
illustrating
that
MnO
RSC Advances,
Journal Year:
2024,
Volume and Issue:
14(12), P. 8028 - 8038
Published: Jan. 1, 2024
Biomass
waste-derived
activated
carbon
has
a
wide
range
of
applications,
including
air
and
water
purification,
gas
separation,
energy
storage,
catalysis.
This
material
become
increasingly
popular
in
recent
years
as
result
the
growing
demand
for
sustainable
eco-friendly
materials.
In
this
study,
Energy & Fuels,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 3, 2025
Waste
biomass,
such
as
spent
coffee
grounds
(SCG),
presents
an
abundant
and
sustainable
source
of
carbon
for
energy
storage
other
applications.
In
this
study,
ultrahigh
surface
area
was
synthesized
from
evaluated
electrode
material
supercapacitors.
Using
alkali
activation
process
with
potassium
hydroxide
(KOH),
the
produced
nanoporous
exhibited
BET
(∼3600
m2/g)
a
large
pore
volume
(1.80
cm3
g–1),
95%
presence
micropores.
These
structural
characteristics
significantly
enhanced
electrochemical
performance
material,
making
it
suitable
use
in
devices.
Electron
spin
resonance
(ESR)
measurements
were
conducted
to
quantify
number
radicals,
aiming
shed
light
on
mechanism
behind
formation
high
carbons.
The
activated
tested
two-electrode
supercapacitor
setup
ionic
liquid
electrolyte,
demonstrating
excellent
capacitive
properties.
It
achieved
specific
capacitances
131
96
F
g–1
at
0.5
4
A
g–1,
respectively.
Furthermore,
gravimetric
density
52
W
h
kg–1
power
871
1
outperforming
commercially
available
carbons
SBET
∼2500
m2/g.
testing
showed
stable
across
wide
voltage
window
up
3.5
V,
minimal
pseudocapacitive
behavior,
confirming
its
suitability
supercapacitors
demands.
This
work
underscores
potential
converting
waste
biomass
into
high-performance
materials,
offering
environmentally
friendly
cost-effective
solution.
results
highlight
advantages
using
grounds-derived
supercapacitors,
opening
pathways
further
development
materials
Langmuir,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 27, 2025
The
remediation
of
wastewaters
contaminated
with
dyes
(discharged
mainly
from
industry)
is
very
important
for
preserving
environmental
quality
and
human
health.
In
this
study,
a
new
composite
chitosan
(CS)-based
adsorbent
combined
activated
carbon
(AC)
curcumin
(Cur)
(abbreviated
hereafter
as
CS/AC@Cur)
in
three
different
ratios
(12.5%,
25%,
50%)
was
synthesized
the
removal
anionic
[reactive
black
5
(RB5)]
cationic
[methylene
blue
(MB)]
single-component
or
binary
systems.
materials
were
completely
characterized
through
Fourier
transform
infrared
spectroscopy,
scanning
electron
microscopy,
Brunauer-Emmett-Teller
analysis,
X-ray
diffraction.
Specifically,
decrease
surface
area
CS/AC@
observed
addition
curcumin,
163
to
18
m2/g,
all
CS/AC@Cur
derivatives.
terms
adsorption
results,
optimal
derivative
both
RB5
MB
found
be
CS/AC@Cur50%,
providing
93%
at
pH
2.0
±
0.1
54%
optimum
9.0
due
electrostatic
attractions.
Elovich
pseudo-second-order
kinetic
model,
correlation
coefficient
R2
>0.98,
better
tailored
indicating
that
controlled
by
chemisorption.
addition,
Sips
(Langmuir-Freundlich)
isotherm
model
fitted
calculated
capacities
338
307
mg/g
MB,
respectively.
thermodynamic
analysis
showed
spontaneous
endothermic
procedure,
chemisorption
main
mechanism.
Reuse
experiments
efficiency
retained
high
levels,
while
stability
studies
revealed
retains
its
structural
integrity,
even
extreme
values.
Finally,
mixed
solution
investigated,
competitive
effect
between
dyes.
Journal of Cleaner Production,
Journal Year:
2022,
Volume and Issue:
366, P. 132685 - 132685
Published: June 14, 2022
Wastewater
treatment
plants
(WWTPs)
use
granular
activated
carbons
(GACs)
as
odor
retainers
because
of
their
high
surface
area
and
porosity.
The
volatile
compounds
retained
in
these
GAC
beds
saturate
pores
are
periodically
replaced
by
pristine
GACs,
which
frequently
made
from
biomass
materials
such
coconut
shell.
Here,
order
to
recycle
exhausted
GACs
reuse
them
again
adsorbents
a
WWTP,
thermal
regeneration
wastes
is
proposed.
Aiming
achieve
more
efficient
cleaner
production,
the
pros
cons
using
an
oxidizing
versus
inert
atmosphere
evaluated.
This
work
demonstrates
that
simple
process
at
temperatures
no
higher
than
350
°C
for
1
h
can
with
appropriate
characteristics
adsorbent
gaseous
emissions
evidencing
lower
cost
against
regenerative
(about
20%
atmosphere).
Their
specific
micropore
volume
values
around
475
m2/g
0.264
cm3/g,
respectively,
range
(406
0.229
cm3/g).
best
yield
was
96.8%
SL-300-N2
sample.
Interestingly,
900
allows
production
optimized
textural
properties
(SBET
≈
675
m2/g),
dual
system
micro/mesopores
(Vt
0.4
cm3/g
Vmicro
0.27
cm3/g),
also
efficiency
90.5%
SL-900-N2,
would
make
it
raw
material
interest
applications
stringent
requirements.
