Conversion
of
agricultural
biomass
waste
to
value-added
biochar
based
catalysts
receives
tremendous
interests
because
it
falls
into
the
scope
resource
recycle
concept.
In
this
work,
a
magnetic
iron-manganese
bimetallic
catalyst
(MnFe2O4@NBC)
with
nitrogen-doped
as
carrier
was
prepared
by
solvothermal
method
using
walnut
shells
precursor,
and
structure,
morphology,
separation
properties
were
comprehensively
analyzed
various
characterization
means.
The
MnFe2O4@NBC
coupled
peroxymonosulfate
(PMS)
for
oxidative
degradation
naphthalene
(NAP).
results
showed
that
could
effectively
activate
PMS,
removal
rate
NAP
reach
80.17%
in
120
min.
through
synergistic
action
free
radical
pathway
(SO4∙−
∙OH)
non-radical
(1O2),
but
dominant.
XPS,
electrochemical
profiles,
DFT
calculations
confirmed
surfaces
Fe2+,
Mn2+,
C=O,
pyridine
nitrogen
defective
structures
are
important
reaction
sites
PMS
activation;
effect
Fe
Mn
bimetals
promotes
rapid
cycling
metal
redox
pairs,
whereas
NBC
dispersion
MnFe2O4,
direct
activation
enhancement
electron
transfer,
formation
built-in
electric
field
facilitate
process.
decrease
after
three
times
reuse,
their
activity
be
restored
simple
heat
treatment,
showing
great
potential
application.
brief,
work
provides
an
efficient
heterogeneous
new
insight
activation,
which
extends
application
environmental
remediation.
Journal of environmental chemical engineering,
Год журнала:
2024,
Номер
12(2), С. 112015 - 112015
Опубликована: Янв. 28, 2024
A
carbonaceous
material
was
prepared
from
industrial
wastes
(sawdust),
modified
with
manganese
to
form
SW-Mn,
and
tested
activate
peroxymonosulfate
(PMS)
under
the
influence
of
ultrasound
(US)
at
frequencies
40
kHz
375
kHz.
This
activation
aimed
degrade
relevant
antibiotic
ciprofloxacin
in
water.
SW-Mn
characterized
through
spectroscopic,
thermal,
textural,
electrochemical
techniques.
The
sonocarbocatalytic
system
(i.e.,
carbocatalysis
using
assisted
by
kHz)
synergistically
degraded
target
pollutant,
exhibiting
diverse
oxidizing
properties.
metallic
species
underwent
oxidation
=Mn2+
changed
=Mn4+)
PMS
action,
same
time,
activated
producing
singlet
oxygen
(1O2).
Moreover,
low-frequency
caused
particle
disaggregation
making
more
available
active
sites
on
enhancing
elimination
ciprofloxacin.
generated
1O2
attack
=Mn4+
transformed
piperazyl
ring
modifying
biological
activity
As
a
result,
sonocarbocatalysis
reduced
both
antimicrobial
phytotoxicity
pollutant.
Furthermore,
treatment
induced
100%
degradation
irrigation
crop
water,
requiring
only
5
min
sonocarbocatalysis,
even
faster
than
distilled
which
associated
effects
matrix
components.
study
demonstrates
suitability
materials
derived
sawdust
Mn
act
as
catalysts
improvement
performance
carbocatalytic
process
waves
toward
water
samples.
Water,
Год журнала:
2023,
Номер
15(20), С. 3679 - 3679
Опубликована: Окт. 20, 2023
A
carbonaceous
material
obtained
from
wood
wastes
(SW-Mn)
was
initially
used
for
the
removal
of
pharmaceuticals
in
water
by
a
carbocatalytic
system.
The
SW-Mn
adsorbed
only
41%
diclofenac
(DCF)
and
3%
valsartan
(VAL).
Interestingly,
activated
peroxymonosulfate
(PMS)
presented
significant
increase
rate
DCF,
surpassing
90%,
while
VAL
achieved
24%
at
20
min
treatment.
not
effective
activating
peroxydisulfate
or
hydrogen
peroxide.
Nevertheless,
addition
ultrasound
waves
40
kHz
to
system
(SW-Mn
+PMS)
significantly
enhanced
degradation,
exhibiting
high
synergy
index
(4.98).
routes
degradation
were
determined
using
scavengers,
XPS
EPR
analyses,
evidencing
main
action
singlet
oxygen
both
sonocarbocatalytic
systems.
It
is
important
note
that
radicals
also
participated
process,
albeit
with
minor
contribution.
reuse
tested
during
various
cycles,
showing
up
39.2%
after
third
consecutive
reuse.
Moreover,
applied
sample
irrigation
crop
spiked
VAL.
treatment
induced
partial
elimination
pollutant
due
some
interfering
effects
matrix
components.
Environmental Science and Pollution Research,
Год журнала:
2023,
Номер
30(59), С. 123616 - 123632
Опубликована: Ноя. 22, 2023
Pristine
pyrogenic
carbonaceous
material
(BRH)
obtained
from
rice
husk
and
modified
with
FeCl3
(BRH-FeCl3)
were
prepared
explored
as
carbocatalysts
for
the
activation
of
peroxymonosulfate
(PMS)
to
degrade
a
model
pharmaceutical
(acetaminophen,
ACE)
in
water.
The
BRH-FeCl3/PMS
system
removed
faster
than
BRH/PMS.
This
is
explained
because
BRH-FeCl3,
compared
BRH,
modification
(iron
played
role
structuring
agent
mainly)
increased
average
pore
diameter
presence
functional
groups
such
-COO-,
-Si-O-,
or
oxygen
vacancies,
which
allowed
remove
pollutant
through
an
adsorption
process
significant
carbocatalytic
degradation.
BRH-FeCl3
was
reusable
during
four
cycles
had
higher
efficiency
activating
PMS
another
inorganic
peroxide
(peroxydisulfate,
PDS).
effects
concentrations
evaluated
optimized
experimental
design,
maximizing
ACE
In
system,
non-radical
pathway
(i.e.,
action
singlet
oxygen,
interaction
defects
and/or
-COO-/-Si-O-
moieties
on
BRH-FeCl3)
found.
generated
only
one
primary
degradation
product
that
more
susceptible
biodegradation
less
active
against
living
organisms
ACE.
Also,
induced
partial
removals
chemical
demand
dissolved
organic
carbon.
Furthermore,
eliminated
wide
pH
range
simulated
urine,
having
low-moderate
electric
energy
consumption,
indicating
feasibility
treat
water
polluted
pharmaceuticals.
