In
the
O3
self-decomposition
process,
poor
conversion
from
HO2•
to
HO2ˉ
limits
decomposition
and
•OH
production.
Although
addition
of
Fenton’s
reagent
facilitates
this
H2O2
consumption
Fe(III)
sedimentation
must
be
addressed.
study,
carbon-coated
Fe3O4
(Fe3O4@C)
samples
were
prepared
using
metal-organic
frameworks
(MOFs)
modification
method
for
catalytic
ozonation
aromatics,
which
effectively
solved
above
challenges.
The
fabricated
4-Fe3O4@C
catalyst
not
only
exhibited
a
yolk-shell
structure,
but
also
increased
production
by
9-fold,
resulting
in
optimal
target
removal,
mineralization,
efficiency.
Further
investigation
confirmed
that
activity
was
owing
combined
action
Fe(II)
on
surface
produced
aromatic
degradation.
Furthermore,
outer
carbon
layer
with
reducing
properties
regenerated
timely
manner,
ensuring
durability.
Finally,
clear
pathway
enhancing
generation
is
proposed.
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(26), С. 11649 - 11660
Опубликована: Июнь 14, 2024
Brominated
byproducts
and
toxicity
generation
are
critical
issues
for
ozone
application
to
wastewater
containing
bromide.
This
study
demonstrated
that
ultraviolet/ozone
(UV/O3,
100
mJ/cm2,
1
mg-O3/mg-DOC)
reduced
the
cytotoxicity
of
from
14.2
mg
pentol/L
produced
by
ozonation
4.3
(1
mg/L
bromide,
pH
7.0).
The
genotoxicity
was
also
1.65
0.17
μg-4-NQO/L
UV/O3.
Compared
with
O3
alone,
adsorbable
organic
bromine
25.8
5.3
μg/L
UV/O3,
but
bromate
increased
32.9
71.4
μg/L.
UV/O3
process
enhanced
removal
pre-existing
precursors
(highly
unsaturated
phenolic
compounds
poly
aromatic
hydrocarbons),
while
new
were
generated,
yet
combined
effect
on
did
not
result
in
a
significant
change
toxicity.
Instead,
UV
radiation
inhibited
HOBr
concentration
through
both
rapid
decomposition
reduce
production
formed
HOBr,
thus
suppressing
AOBr
formation.
However,
hydroxyl
radical-dominated
pathway
led
increase
bromate.
Considering
bromate,
effectively
controlled
mammalian
cells,
even
though
an
emphasis
should
be
placed
managing
elevated
Futhermore,
other
end
points
needed
evaluate
outcomes
process.
Functional Materials Letters,
Год журнала:
2023,
Номер
17(02)
Опубликована: Дек. 17, 2023
The
advanced
oxidation
process
(AOPs)
based
on
natural
pyrite
(NP)
as
a
catalyst
is
promising
strategy
for
flotation
wastewater
purification.
However,
the
slow
Fe(III)/Fe(II)
cycle
limits
number
of
active
sites
during
oxidant
activation.
Therefore,
this
work
attempts
to
accelerate
reduction
NP
surface
by
introducing
visible
light
irradiation.
By
comparing
degradation
performance
sodium
butylxanthate
(SBX)
via
various
oxidants
(peroxydisulfate,
periodate,
hydrogen
peroxide,
and
sulfite)
activation
under
light,
periodate
was
selected
most
suitable
SBX
removal.
Although
peroxydisulfate
exhibits
optimal
in
acidic
environments,
its
failure
alkaline
environments
poor
reusability
caused
high
limit
application.
investigation
species
suggests
that
O
2
[Formula:
see
text]
are
dominant
peroxide
sulfite
systems,
while
electron
transfer
systems.
Electrochemistry
elucidates
interaction
different
surface.
XPS
analysis
revealed
photogenerated
electrons
induced
irradiation
surface,
thereby
improving
continuous
towards
oxidants.
In
addition,
ecotoxicity
treated
system
greatly
reduced.
This
provides
new
idea
