Applied Sciences,
Год журнала:
2024,
Номер
14(23), С. 10955 - 10955
Опубликована: Ноя. 26, 2024
Cigarette
butt
littering
poses
a
significant
environmental
challenge,
with
billions
of
butts
discarded
each
year,
fouling
ecosystems
slow-to-decompose
cellulose
acetate
filters
that
absorb
and
release
harmful
compounds.
In
response,
an
innovative,
sustainable
approach
for
valorizing
ballot
bin
waste
(BBW)
by
extracting
high-quality
from
cigarette
was
investigated.
This
green
eliminates
the
need
hazardous
acids
toxic
solvents,
resulting
in
yield
30%
(w/w)
degree
substitution
(DS)
2.0–2.5,
which
is
comparable
to
pure
acetate.
The
following
four
essential
processes
are
involved
this
process:
filter
separation,
water
washing
remove
impurities,
ethanol
purification,
acetone
precipitation
not
only
mitigates
harm,
but
also
supports
circular
economy
goals
transforming
into
valuable
resources.
Applied Catalysis B Environment and Energy,
Год журнала:
2023,
Номер
343, С. 123515 - 123515
Опубликована: Ноя. 17, 2023
Fe-Nx-C
electrocatalysts
for
the
oxygen
reduction
reaction
are
typically
fabricated
via
pyrolysis.
However,
pyrolysis
process
is
poorly
understood.
Therefore,
a
systematic
investigation
was
initiated
to
elucidate
effects
of
conditions
(atmosphere
and
temperature)
on
evolution
active
sites
starting
from
iron
phthalocyanine
supported
over
carbon
black.
The
atomic
level
dispersion
Fe-Nx
sustained
up
600°C
afterward,
growth
oxide
nanoparticles
observed.
Interestingly,
different
X-ray
absorption
spectroscopy
fingerprints
acquired
during
in-situ
ex-situ
experiments
indicated
bonding
as
fifth
ligand
Fe
when
exposed
open
air.
ORR
activities
were
analyzed
in
acidic
alkaline
media.
best
electrocatalytic
activity
observed
pyrolyzed
at
600°C.
Above
this
temperature,
Surface-to-reactivity
analysis
carried
out
identifying
relationship
between
surface
chemistry/morphology
activity.
Electrochimica Acta,
Год журнала:
2024,
Номер
492, С. 144353 - 144353
Опубликована: Апрель 28, 2024
The
annual
generation
of
coffee
waste
has
overtaken
6
million
metric
tons,
becoming
a
serious
environmental
problem.
Herein,
we
report
the
fabrication
bimetallic
electrocatalysts
synthesized
by
1)
pyrolyzing
spent
grounds
(SCGs)
at
400,
600,
800
and
1000°C,
2)
activating
as-obtained
char
with
KOH
3)
functionalizing
activated
carbon
iron(II)
manganese(II)
phthalocyanine.
final
showed
high
degree
amorphousness,
defectivity
(increasing
temperature)
specific
surface
area
(up
to
1820
m2
g−1).
In
half-cell
compartment
(0.1M
electrolyte),
top-notch
material
in
terms
oxygen
reduction
reaction
(ORR)
activity
selectivity
was
CFeMn_600,
which
same
half-wave
potential
(E1/2)
compared
Pt/C
standard
along
lower
peroxide
production.
These
outstanding
results
could
be
attributed
area,
Fe-Mn
synergy,
an
abundance
C-N
defects.
performance
CFeMn_600
as
cathode
alkaline
exchange
membrane
fuel
cells
(AEMFC)
open
circuit
voltage
(OCV)
0.890
V
power
density
30
mW
cm−2.
Notwithstanding,
this
research
is
one
few
cases
where
waste-derived
electrocatalyst
tested
real
AEMFC,
thus
pioneer
cell
study
electrode
materials.
Nanoscale,
Год журнала:
2024,
Номер
16(13), С. 6531 - 6547
Опубликована: Янв. 1, 2024
A
detailed
investigation
into
Fe-based
catalysts
derived
from
phthalocyanine
with
mono,
bi,
and
tri-metallic
compositions
is
presented,
focusing
on
how
their
processing
structure
affect
oxygen
reduction
reaction
activity
in
alkaline
media.
Abstract
Trillion
of
cigarette
butts
are
annually
littered
without
being
recycled.
This
work
aims
at
valorizing
the
whole
and
their
components
(paper,
filter
tobacco)
into
Fe‐N
x
‐C
electrocatalysts
for
oxygen
reduction
reaction
(ORR)
in
acid
alkaline
media.
The
pristine
wastes
were
pyrolyzed
450
°C,
activated
with
KOH
700
blended
iron
phthalocyanine
(FePc)
precursor,
heat‐treated
600
°C
to
produce
a
robust
material
ORR
active
units.
effect
on
final
electrocatalytic
activity
was
evaluated
by
thoroughly
investigating
surface
chemistry
XPS.
displayed
similar
results
among
different
both
media
due
comparable
chemistry,
especially
concerning
nitrogen
functional
groups.
highest
performance
obtained
where
from
cigarettes
paper
(CIGF_450
CIGPF_450)
showed
an
E
1/2
0.89
V
vs
RHE,
slightly
larger
than
that
Pt/C
40
wt
%
Pt,
which
encouraged
replace
Pt‐based
fuel
cells.
Industrial Chemistry and Materials,
Год журнала:
2023,
Номер
1(3), С. 343 - 359
Опубликована: Янв. 1, 2023
HER
electrocatalysts
were
synthesized
starting
from
metal-phthalocyanine.
The
higher
pyrolysis
temperature
is
beneficial
and
associated
with
the
formation
of
nanoparticles.
addition
second
third
metal
also
for
HER.
ACS Applied Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 4, 2024
The
availability
of
robust
and
accessible
active
sites
in
iron–nitrogen-carbon
(Fe–Nx-C)
electrocatalysts
is
essential
to
optimize
the
oxygen
reduction
reaction
(ORR),
which
main
obstacle
commercial
realization
fuel
cells.
Herein,
a
modified
hard
templating
method
develop
efficient
Fe–Nx-C
has
been
presented
that
not
only
ensured
generation
porous
architecture
but
also
helped
homogeneous
distribution
Fe
throughout
structure.
First,
silica
nanoparticles
(NPs)
were
grown
via
Stöber
process
then
functionalized
atomically
with
iron
through
two
different
types
silane
chains,
i.e.,
(3-aminopropyl)triethoxysilane
(APTES)
N-(2-Aminoethyl)-3-aminopropyltriethoxysilane
(EDTMS).
Fe-functionalized
simultaneously
acting
as
sacrificial
template
well
an
source
was
impregnated
nicarbazin,
carbon
nitrogen
precursor.
dried
mix
subject
pyrolysis
(H1)
followed
by
acid
washing
dissolve
templates,
then,
again,
it
subjected
another
treatment
(H2).
At
each
proceeding
step,
ORR
activity
both
acidic
alkaline
media
improved
samples
obtained
at
last
stage
(i.e.,
H2)
outperformed
other
counterparts
collected
initial
stages
fabrication
pathway.
Eventually,
electrocatalyst
developed
using
EDTMS-type
attached
NPs
(E_FeNC_H2)
demonstrated
highest
onset
potentials
990
mV
vs
RHE
862
media.
Moreover,
lower
peroxide
yield
E_FeNC_H2
signifying
nearly
direct
4e–
attributed
specific
surface
area
(627
m2
g–1)
optimum
combination
moieties
dispersed
carbonaceous
framework.
Journal of Environmental Sciences,
Год журнала:
2023,
Номер
140, С. 230 - 241
Опубликована: Июль 27, 2023
Cigarette
butts
(CBs)
are
one
of
the
most
common
types
litter
in
world.
Due
to
toxic
substances
they
contain,
waste
generated
poses
a
harmful
risk
environment,
and
therefore
there
is
an
urgent
need
for
alternative
solutions
landfill
storage.
Thus,
this
work
presents
possible
revalorization
material,
which
implies
interesting
environmental
benefits.
CBs
were
used
as
sacrificial
templates
preparation
CaO-based
materials
by
impregnation
with
calcium
magnesium
nitrates
followed
flaming
combustion.
These
presented
enhanced
porosity
their
use
Calcium
Looping
process
applied
either
thermochemical
energy
storage
or
CO2
capture
applications.
The
influence
concentration
Ca
Mg
impregnating
on
multicycle
reactivity
samples
was
studied.
An
improved
performance
obtained
terms
conversion
both
