Ferrihydrite
(Fh),
as
a
ubiquitous
iron
(oxyhydr)oxide,
plays
an
essential
role
in
nutrient
cycling
and
pollutant
transformation
due
to
its
high
surface
area
diversified
reaction
sites.
In
the
natural
environment,
Fh
could
be
easily
influenced
by
coexisting
components
(particularly
dissolved
organic
matter
(DOM)
anions).
As
new
important
carbon
source,
microplastic-derived
DOM
(MP-DOM)
directly
or
indirectly
affects
morphology
fate
of
Fh,
but
limited
knowledge
exists
about
combined
effect
MP-DOM
anions
on
transformation.
Herein,
this
study
elucidates
joint
effects
polystyrene
(PS-DOM)
(such
Cl-,
SO42-,
PO43-)
Single
(especially
were
shown
inhibit
hematite
(Hm)
hindering
dissolution
recrystallization
Fe(III).
However,
inhibitory
was
strongly
enhanced
when
PS-DOM
coexisted,
which
is
attributed
their
synergetic
inhibiting
dissolution/recrystallization
occupying
more
active
sites
electron
transfer.
Furthermore,
predominantly
controlled
PS-DOM,
especially
those
containing
high-unsaturation,
high-oxidation-state,
O-rich
phenolic
compounds.
These
findings
provide
perspective
significance
considering
evaluating
minerals.
Surface
runoff
horizontally
distributed
chromium
(Cr)
pollution
into
various
surface
environments.
Sunlight
is
a
vital
factor
for
the
Cr
cycle
in
environment,
which
may
be
affected
by
photoactive
substances
such
as
ferrihydrite
(Fh)
and
dissolved
black
carbon
(DBC).
Herein,
sunlight-driven
transformation
dynamics
of
species
on
DBC-Fh
coprecipitates
were
studied.
Under
sunlight,
removal
aqueous
Cr(VI)
occurred
through
reductive
sequestration
including
adsorption,
followed
reduction
(pathway
1)
reduction,
precipitation
2).
Additionally,
with
higher
DBC
content
exhibited
more
effective
both
adsorbed
(
Environmental Science & Technology,
Journal Year:
2024,
Volume and Issue:
58(43), P. 19277 - 19288
Published: Oct. 14, 2024
Short-range-ordered
minerals
like
ferrihydrite
often
bind
substantial
organic
carbon
(OC),
which
can
be
altered
if
the
transform.
Such
mineral
transformations
catalyzed
by
aqueous
Fe(II)
(Fe(II)
Biochar
is
extensively
utilized
for
the
remediation
of
sites
contaminated
with
heavy
metals,
mitigating
bioavailability
and
potential
environmental
risk
metals
through
mechanisms
immobilization
transformation.
However,
due
to
presence
metal
ions
in
soil
minerals
complexity
pollution
at
actual
sites,
effectiveness
biochar
amending
contamination
remains
uncertain.
This
study
addresses
issue
by
employing
molybdenum
dioxide-modified
remediate
various
polluted
environments.
It
also
integrates
Fe(II)/Fe(III)
oxidation-reduction
cycle
tests
confirm
efficacy
modified
removing
Cr(VI)
explore
adsorption
mechanisms.
The
results
indicate
that
addition
alters
redox-active
components
soil,
enhancing
redox
cycling
iron
within
soil.
decreases
following
order:
dioxide-loaded
(BC/M)
>
ball-milled
dioxide
(BC+M)
original
(BC).
indicates
test,
remedial
agent
utilizing
reduce
was
more
effective
than
capability
agent.
provides
a
reference
management
farmland
preparation
materials.
