Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(25), P. 9394 - 9404
Published: June 13, 2023
Electron
paramagnetic
resonance
(EPR)
spectroscopy
using
sterically
hindered
amine
is
extensively
applied
to
detect
singlet
oxygen
(1O2)
possibly
generated
in
advanced
oxidation
processes.
However,
EPR-detectable
1O2
signals
were
observed
not
only
the
1O2-dominated
hydrogen
peroxide
(H2O2)/hypochlorite
(NaClO)
reaction
but
surprisingly
also
1O2-absent
Fe(II)/H2O2,
UV/H2O2,
and
ferrate
[Fe(VI)]
process
with
even
stronger
intensities.
By
taking
advantage
of
characteristic
between
9,10-diphenyl-anthracene
near-infrared
phosphorescent
emission
1O2,
was
excluded
Fe(VI)
process.
The
false
detection
ascribed
direct
piperidyl
radical
by
reactive
species
[e.g.,
•OH
Fe(VI)/Fe(V)/Fe(IV)]
via
transfer,
followed
molecular
addition
(forming
a
piperidylperoxyl
radical)
back
generate
nitroxide
radical,
as
evidenced
successful
identification
intermediate
at
100
K
theoretical
calculations.
Moreover,
compared
highly
oxidative
(e.g.,
high-valence
Fe),
much
lower
reactivity
profound
nonradiative
relaxation
H2O
resulted
it
too
selective
inefficient
organic
contaminant
destruction.
This
study
demonstrated
that
EPR-based
could
be
remarkably
misled
common
thereby
jeopardize
understandings
on
1O2.
ACS ES&T Engineering,
Journal Year:
2023,
Volume and Issue:
4(1), P. 19 - 46
Published: Aug. 14, 2023
Persulfate
based
advanced
oxidation
processes
(PS-AOPs)
have
been
regarded
as
a
mainstream
degradation
technology
of
organic
compounds
due
to
their
high
efficiency
in
wastewater
treatment.
In
particular,
peroxymonosulfate
(PMS)
has
unique
structure
and
chemical
properties,
which
can
be
efficiently
activated
by
Co-based
catalysts
produce
active
species
with
potential.
These
usually
determine
the
subsequent
an
efficient
process,
while
intrinsic
reaction
mechanism
behind
this
complex
process
remains
unclear
therefore
impedes
continual
development
scientific
community.
Recently,
density
functional
theory
(DFT)
calculations
emerged
powerful
means
identify
electronic
properties
distinguish
energy
changes
PMS
activation
system.
With
assistance
quantum
calculation,
increasing
investigations
conducted
focusing
on
explaining
phenomenon
that
occurred
experiments.
However,
these
mainly
contributed
part
sometimes
even
differ
from
each
other,
lacking
comprehensive
summary
DFT
calculation
results.
review,
we
introduce
main
uses
catalytic
PMS,
provide
recent
application
examples
heterogeneous
different
structures,
then
discuss
detail.
Finally,
research
results
method
field
are
summarized,
future
focus
challenges
put
forward,
is
conducive
guiding
practical
design
further
PS-AOPs
creating
value
products.
ACS Applied Nano Materials,
Journal Year:
2024,
Volume and Issue:
7(10), P. 11386 - 11400
Published: May 9, 2024
The
Mn–Co
dual-metal
oxide
is
recognized
as
an
effective
activator
for
peroxymonosulfate
(PMS),
but
its
activation
mechanism
remains
controversial.
In
this
study,
a
Co/Mn–C–N
(CMCN)
nanocatalyst
was
synthesized
using
simple
pyrolysis
method,
and
catalytic
activity
along
with
the
PMS
comprehensively
explored.
findings
indicated
that
synergistic
effect
of
Mn
Co
within
bimetallic
composition
significantly
enhanced
efficiency
CMCN
compared
to
those
individual
metal
oxides
(Mn–C–N
Co–C–N).
Bisphenol
A
underwent
successful
degradation
3
min
in
neutral
environment,
kinetic
rate
1.59
min–1
total
organic
carbon
removal
63.8%.
Moreover,
nanoparticles
demonstrated
remarkable
stability
reusability,
maintaining
their
efficacy
over
four
cycles.
Employing
series
experiments
analytical
characterizations,
novel
proposed,
involving
both
radical
nonradical
pathways.
This
involves
oxidation
pollutants
through
direct
electron
transfer
process
from
metastable
intermediate
complexes.
Notably,
CMCN/PMS
system
exhibited
robust
resistance
interference
factors.
research
provides
insights
into
development
composites
recalcitrant
water
pollutants.
Nanomaterials,
Journal Year:
2024,
Volume and Issue:
14(5), P. 473 - 473
Published: March 5, 2024
The
release
of
organic
contaminants
has
grown
to
be
a
major
environmental
concern
and
threat
the
ecology
water
bodies.
Persulfate-based
Advanced
Oxidation
Technology
(PAOT)
is
effective
at
eliminating
hazardous
pollutants
an
extensive
spectrum
applications.
Iron-based
metal-organic
frameworks
(Fe-MOFs)
their
derivatives
have
exhibited
great
advantages
in
activating
persulfate
for
wastewater
treatment.
In
this
article,
we
provide
comprehensive
review
recent
research
progress
on
significant
potential
Fe-MOFs
removing
antibiotics,
dyes,
phenols,
other
from
aqueous
environments.
Firstly,
multiple
approaches
preparing
Fe-MOFs,
including
MIL
ZIF
series
were
introduced.
Subsequently,
removal
performance
such
as
antibiotics
sulfonamides
tetracyclines
(TC),
dyes
rhodamine
B
(RhB)
acid
orange
7
(AO7),
phenols
phenol
bisphenol
A
(BPA)
by
various
was
compared.
Finally,
different
degradation
mechanisms,
encompassing
free
radical
pathways
non-free
elucidated.
This
explores
synthesis
methods
application
bodies,
providing
insights
further
refining
preparation
Fe-MOFs.
