Manganese
dioxide
(MnO2)
holds
great
potential
as
a
pseudocapacitive
material
for
supercapacitors,
but
its
low
electric
conductivity
limits
ability
to
reach
the
theoretically
predicted
capacitance.
In
this
study,
we
successfully
synthesized
MnO2
in
situ
on
porous
carbon
microspheres
derived
from
bamboo
pulp
fibers
using
hydrothermal
method.
The
morphology
and
phase
of
were
controlled
by
adjusting
reduction
reaction
KMnO4.
PCS
coated
with
sheet-like
δ-MnO2
obtained
at
Mn/C
ratio,
resulting
specific
surface
area
401.4
m2
g-1.
composite
exhibited
an
impressive
capacitance
364.4
F
g-1
current
density
0.5
A
99.7%
retention
after
10,000
cycles.
performance
was
improved
81%
incorporation.
This
study
presents
promising
prospects
sustainable
environmentally
friendly
production
bamboo-derived
materials
supercapacitors.
Colloids and Surfaces A Physicochemical and Engineering Aspects,
Journal Year:
2024,
Volume and Issue:
684, P. 133167 - 133167
Published: Jan. 8, 2024
The
increasing
demand
for
clean
water
requires
the
development
of
simple,
cheap,
and
efficient
catalysts
systems
pollution
remediation.
To
develop
cheap
yet
hybrid
advanced
oxidation
processes
degradation
organic
pollutants
in
their
systematic
comparison
under
similar
conditions
to
make
informed
decisions
economically
feasible
sustainable
systems.
Visible
light
active
single
BiOI
N,
Pd
co-doped
TiO2
were
investigated
photocatalytic
ozonation
(PCO)
methylene
blue
(MB)
degradation.
Metal
non-metal
co-doping
improved
morphology,
band
structure
sites
on
surface
shift
its
absorption
into
visible
region.
MB
with
PCO
N,Pd-TiO2
was
practically
but
showed
improvement
mineralization
efficiency.
However,
surpassed
that
due
influenced
generated
free
radicals
during
processes.
system
progressed
through
existence
involvement
strongly
oxidizing
non-selective
hydroxyl
towards
enhanced
dye
intermediates
while
steered
by
superoxide
radical
is
selective
had
lower
efficiency
formed
despite
high
initial
efficacy.
work
demonstrated
semiconductors
like
as
potential
candidates
application
real
applications
matching
activities
UV
TiO2.
This
advances
use
based
environmental
The
strong
metal–support
interaction
(MSI)
has
been
widely
attributed
to
enhanced
catalytic
activity.
However,
this
attribution
might
be
wrong
in
ozonation,
since
MSI
that
is
too
impede
the
activation
of
electron-poor
ozone
molecules.
Herein,
we
reported
a
strategy
subtly
modulate
Mn–O–Si
by
intercalating
carbon
film
between
silica
support
and
active
manganese
oxide.
When
using
MnOx/0.5C/SiO2
with
moderate
as
catalyst
ozonation
refractory
paracetamol
(PCM),
91.1
±
2.4%
PCM
was
removed
within
30
min,
about
30%
higher
than
MnOx/SiO2
MSI.
Moreover,
reaction
rate
reached
8.01
×
10–2
min–1,
2.2
1.3
times
MnOx/1C/SiO2,
respectively.
Importantly,
further
integration
into
membrane
filtration
achieved
high
rejections
(>94.3%)
under
various
realistic
water
scenarios
during
continuous
12
h
operation,
demonstrating
resistance
environmental
matrices
interference.
Experimental
theoretical
evidence
revealed
resulted
dispersion
MnOx
nanoclusters
size
2.3–4.4
nm
promoted
adsorption
over
its
dissociation
surface
*O,
•OH,
•O2–,
1O2
for
decontamination.
As
constructive
work,
study
significance
offered
simple
regulation
method
constructing
interfaces
metal-supported
catalysts.
Water Environment Research,
Journal Year:
2024,
Volume and Issue:
96(4)
Published: April 1, 2024
Abstract
In
this
study,
we
synthesized
magnetic
MnFe
2
O
4
/ZIF‐67
composite
catalysts
using
a
straightforward
method,
yielding
that
exhibited
outstanding
performance
in
catalyzing
the
ozonation
of
vanillin.
This
exceptional
catalytic
efficiency
arose
from
synergistic
interplay
between
and
ZIF‐67.
Comprehensive
characterization
via
x‐ray
photoelectron
spectroscopy
(XPS),
diffraction
(XRD),
Fourier
transform
infrared
spectrometer
(FT‐IR),
Brunauer–Emmett–Teller
(BET),
field
emission
scanning
electron
microscopy
(FE‐SEM),
energy
dispersive
(EDS)
confirmed
incorporation
promoted
creation
oxygen
vacancies,
resulting
an
increased
presence
l
adsorbed
(O
ads
)
generation
additional
·OH
groups
on
catalyst
surface.
Utilizing
ZIF‐67
as
carrier
markedly
enhanced
specific
surface
area
catalyst,
augmenting
exposure
active
sites,
thus
improving
degradation
reducing
consumption.
The
effects
different
experimental
parameters
(catalyst
type,
initial
vanillin
concentration,
ozone
dosage,
pH
value,
dosage)
were
also
investigated,
optimal
(300
mg/L1.0‐MnFe
/ZIF‐67,
concentration
=
250
mg/L,
3
12
mg/min,
7)
obtained.
removal
was
74.95%
to
99.54%
after
30
min
reaction,
separation
easy
be
recycled
stable,
only
decreased
by
about
8.92%
5
cycles.
Additionally,
delved
into
mechanism
through
kinetic
fitting,
reactive
quenching
experiments,
transfer
analysis.
multifaceted
approach
provides
comprehensive
understanding
process
catalyzed
catalysts,
shedding
light
their
potential
applications
advanced
oxidation
processes.
Practitioner
Points
A
stable
recyclable
simple
method.
effect
comprehensively
analyzed
discussed.
model
for
introduced,
providing
valuable
insights
reaction
dynamics.
