ACS ES&T Engineering,
Journal Year:
2023,
Volume and Issue:
3(10), P. 1521 - 1531
Published: June 24, 2023
The
oxygen
reduction
reaction
(ORR)
was
an
unavoidable
side
in
the
electro-activating
persulfate
(PS)
process,
especially
on
ORR-active
carbon
materials,
which
has
usually
been
ignored
previous
reports.
In
this
work,
O2/N2-involved
electro-activation
of
PS
system
constructed
to
confirm
role
side-reactive
ORR
oxidized
black
(OCB)
for
sulfamethoxazole
(SMX)
degradation.
With
O2
involvement,
820.8
μM
•OH
produced
by
PDS
electro-activation,
over
7
times
more
than
115.8
under
N2
aeration,
leading
a
high
SMX
removal
90.6%
(only
67.8%
aeration).
Such
huge
difference
yield
and
performance
mainly
attributed
2e–
ORR,
as-generated
H2O2
electro-activated
produce
abundant
form
advanced
homogeneous
•OH/SO4•–
oxidation
via
mutual
transformation
with
gradual
acidification.
Meanwhile,
introduction
functional
groups
defects
surface
calcined
at
600
°C
(CB600)
also
contributed
improvement
performance,
attributing
their
enhancing
effects
electro-adsorption,
electro-reduction.
Thus,
played
spontaneous
synergistic
roles
O2-involved
helping
design
highly
effective
systems
future.
Ecotoxicology and Environmental Safety,
Journal Year:
2023,
Volume and Issue:
257, P. 114908 - 114908
Published: April 19, 2023
N-doped
biochar
is
widely
used
for
activating
persulfate
to
degrade
organic
pollutants.
Which
type
of
N
atom
the
key
factor
activation
still
unclear
and
needs
be
further
explored
analyzed.
In
this
study,
four
kinds
were
prepared
using
urea
rice
husk
as
precursors,
tested
catalytic
degradation
dimethomorph.
Increasing
nitrogen
doping
level
caused
removal
efficiency
dimethomorph
in
presence
peroxymonosulfate
increased
from
16.6%
86.8%.
A
correlation
analysis
showed
that
ability
activate
PMS
mainly
related
content
pyrrole
N,
graphite
carbonyl
degree
defects.
experiments
on
electron
paramagnetic
resonance
free
radical
suppression,
reactive
species
SO4•-,
1O2,·OH
O2.−
detected,
among
which
1O2
was
found
main
agent
nonradical
pathway.
The
pathways
analyzed
based
a
total
8
products
identified
by
high-performance
liquid
chromatography-time
flight
mass
spectrometry
(HPLC-Q-TOFMS).
results
study
provide
fundamental
basis
agricultural
waste
produce
inexpensive
efficient
nonmetal
catalysts
are
highly
effective
reducing
levels
lands.
