ACS Earth and Space Chemistry,
Год журнала:
2024,
Номер
8(9), С. 1757 - 1770
Опубликована: Авг. 24, 2024
Natural
environments
subjected
to
hydrologically
driven
redox
fluctuations
are
regarded
as
propitious
contaminant
degradation
since
they
favor
the
cyclic
oxygenation
of
Fe(II)
minerals,
which
produces
oxygen
reactive
species
(ROS),
such
hydroxyl
radical,
OH•.
However,
identity
these
may
vary
a
function
physicochemical
conditions
and
remains
matter
research.
Here,
using
spin-trapping
electron
paramagnetic
resonance
(EPR)
with
5,5-dimethyl-1-pyrroline
N-oxide
(DMPO)
spin
trap,
we
show
that
non-hydroxyl
is
produced
in
significant
amounts
upon
air-oxidation
alluvial
soil
suspensions
(Seine
River
Basin,
France).
Indeed,
among
DMPO–OH•,
DMPO–CO2•–,
DMPO–alkyl•
adducts
observed,
latter
dramatically
increases
addition
ethanol
or,
lesser
extent,
tert-butanol,
especially
phosphate
buffer.
This
result
reveals
dominant
species,
interpret
Fe(IV)
it
known
oxidize
alcohols
alkyl•
radicals
favored
by
ligands.
With
buffer
ethanol,
production
correlates
initial
reduced-state
iron
pool
samples,
determined
Fe
K-edge
X-ray
absorption
spectroscopy
(XAS).
phyllosilicates,
Fe(0)
one
core
and,
vivianite,
found
be
most
significantly
oxidized
phases
oxygenation,
pyrite
appears
less
reactive.
Hence,
differing
from
OH•,
forms
presence
soil-sourced
phosphate.
Our
results
therefore
call
further
directly
identify
this
putative
investigate
its
ability
degrade
organic
contaminants
natural
environments.
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(36), С. 15910 - 15925
Опубликована: Авг. 27, 2024
Globally
increasing
wildfires
and
widespread
applications
of
biochar
have
led
to
a
growing
amount
black
carbon
(BC)
entering
terrestrial
ecosystems.
The
significance
BC
in
sequestration,
environmental
remediation,
the
agricultural
industry
has
long
been
recognized.
However,
formation,
features,
functions
nanosized
BC,
which
is
one
most
active
fractions
continuum
during
global
climate
change,
are
poorly
understood.
This
review
highlights
surface
reactivity
(sorption,
redox,
heteroaggregation),
biotic,
abiotic
transformations
nano-BC,
its
major
differences
compared
other
engineered
nanomaterials.
Potential
nano-BC
including
suspending
agent,
soil
amendment,
nanofertilizer
elucidated
based
on
unique
properties
functions.
Future
studies
suggested
develop
more
reliable
detection
techniques
provide
multidimensional
information
samples,
explore
critical
role
promoting
planetary
health
from
perspective,
extend
multifield
with
lower
footprint
but
higher
efficiency.
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(44), С. 19883 - 19892
Опубликована: Окт. 23, 2024
The
coexistence
of
mackinawite
(FeS)
and
phosphate
is
widely
observed
in
natural
systems.
However,
the
underlying
mechanism
regarding
how
influences
environmental
behavior
FeS,
especially
during
FeS
oxygenation
aquatic
systems,
remains
its
fancy.
This
study
for
first
time
reported
that
presence
phosphate,
even
at
a
low
concentration
0.3
mM,
significantly
promoted
FeS-mediated
O
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(33), С. 14949 - 14960
Опубликована: Авг. 10, 2024
The
presence
and
induced
secondary
reactions
of
natural
organic
matter
(NOM)
significantly
affect
the
remediation
efficacy
in
situ
chemical
oxidation
(ISCO)
systems.
However,
it
remains
unclear
how
this
process
relates
to
radicals
generated
from
between
NOM
oxidants.
study,
for
first
time,
reported
vital
roles
transformation
pathways
carbon-centered
(CCR
Environmental Science & Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 29, 2025
Hydroxyl
radicals
(•OH)
are
extensively
produced
from
crystalline
iron
minerals
under
redox
oscillation,
during
which
their
oxidizing
impact
on
pollutant
dynamics
is
often
limited
by
low
transportation.
While
natural
organic
matter
exists
as
a
ubiquitous
mediator,
how
it
regulates
the
distance
scale
of
•OH
production
in
heterogeneous
system
remains
poorly
understood.
This
study,
for
first
time,
reports
an
unrecognized
route
mediated
humic
acid
(HA)
extending
spatial
range
oxygenation
reduced
hematite
(rHem).
The
results
showed
that
HA
facilitated
redistribution
surface
to
solution,
posing
inverse
impacts
oxidation
efficacies
pollutants
with
varying
accessibilities.
It
was
difficult
explain
enhanced
free
using
electron
shuttling
quinones
or
dissolved
Fe-HA
complexes.
Comprehensive
evidence
demonstrated
adsorbed
preferentially
consumed
surface-bound
trigger
solid-to-liquid
propagation
carbon-centered
(CCR•),
dominantly
promoting
formation
secondary
far
surface.
Reactive-transport
simulation
and
situ
fluorescence
visualized
interfacial
centimeter-scale
long-range
CCR•.
Fourier
transform
ion
cyclotron
resonance
mass
spectrometry
verified
role
decarboxylation
CCR•
generation.
These
findings
offer
new
insights
into
environmental
fate
cycling
engineered
systems,
including
those
matter.
