Environmental Science & Technology,
Год журнала:
2024,
Номер
unknown
Опубликована: Фев. 6, 2024
Microplastics
(MPs)
are
considered
to
influence
fundamental
biogeochemical
processes,
but
the
effects
of
plant
residue-MP
interactions
on
soil
carbon
turnover
in
urban
greenspaces
virtually
unknown.
Here,
an
84-day
incubation
experiment
was
constructed
using
four
types
single-vegetation-covered
soils
(6
years),
showing
that
polystyrene
MP
(PSMP)
pollution
caused
unexpectedly
large
increase
CO2
emissions.
The
additional
originating
from
highly
bioavailable
active
dissolved
organic
matter
molecules
(<380
°C,
predominantly
polysaccharides)
converted
persistent
(380–650
aromatic
compounds)
rather
than
PSMP
derivatives.
However,
priming
effect
derivatives
weakened
plant-driven
(resistivity:
shrub
>
tree
grass).
This
can
be
explained
two
perspectives:
(1)
Plant
residue-driven
humification
processes
reduced
percentage
derived
PSMPs.
(2)
residues
accelerated
bacterial
community
succession
(dominated
by
residue
types)
slowed
fungal
demise
(retained
turnover-related
functional
taxa),
enabling
specific
enrichment
glycolysis,
citric
acid
cycle
and
pentose
phosphate
pathway.
These
results
provide
a
necessary
theoretical
basis
understand
role
reducing
harm
at
ecological
level
refresh
knowledge
about
importance
biodiversity
for
ecosystem
stability.
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(2), С. 991 - 1009
Опубликована: Янв. 3, 2024
Micro-
and
nanoplastics
(MNPs)
are
attracting
increasing
attention
due
to
their
persistence
potential
ecological
risks.
This
review
critically
summarizes
the
effects
of
photo-oxidation
on
physical,
chemical,
biological
behaviors
MNPs
in
aquatic
terrestrial
environments.
The
core
this
paper
explores
how
photo-oxidation-induced
surface
property
changes
affect
adsorption
toward
contaminants,
stability
mobility
water
porous
media,
as
well
transport
pollutants
such
organic
(OPs)
heavy
metals
(HMs).
It
then
reviews
photochemical
processes
with
coexisting
constituents,
highlighting
critical
factors
affecting
MNPs,
contribution
phototransformation
other
contaminants.
distinct
mechanism
aged
pointed
out,
terms
toxicity
organisms,
biofilm
formation,
planktonic
microbial
growth,
soil
sediment
community
function.
Furthermore,
research
gaps
perspectives
put
forward,
regarding
underlying
interaction
mechanisms
natural
constituents
under
conditions,
combined
fate
microbiological
effect
photoaged
especially
biotransformation
pollutants.
Eco-Environment & Health,
Год журнала:
2024,
Номер
3(1), С. 59 - 76
Опубликована: Янв. 3, 2024
Soil,
the
largest
terrestrial
carbon
reservoir,
is
central
to
climate
change
and
relevant
feedback
environmental
health.
Minerals
are
essential
components
that
contribute
over
60%
of
soil
storage.
However,
how
interactions
between
minerals
organic
shape
transformation
stability
remains
poorly
understood.
Herein,
we
critically
review
primary
mechanisms,
including
sorption,
redox
reaction,
co-precipitation,
dissolution,
polymerization,
catalytic
reaction.
These
interactions,
highly
complex
with
combination
multiple
processes,
greatly
affect
through
following
processes:
(1)
formation
or
deconstruction
mineral-organic
association;
(2)
oxidative
minerals;
(3)
polymerization
(4)
varying
association
according
mineral
transformation.
Several
pieces
evidence
related
turnover
during
interaction
in
real
eco-environment
then
demonstrated.
We
also
highlight
current
research
gaps
outline
priorities,
which
may
map
future
directions
for
a
deeper
mechanisms-based
understanding
storage
capacity
considering
its
minerals.
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(23), С. 10334 - 10346
Опубликована: Май 28, 2024
Microplastics
(MPs)-derived
dissolved
organic
matter
(MPs-DOM)
is
becoming
a
non-negligible
source
of
DOM
pools
in
aquatic
systems,
but
there
limited
understanding
about
the
photoreactivity
different
MPs-DOM.
Herein,
MPs-DOM
from
polystyrene
(PS),
polyethylene
terephthalate
(PET),
poly(butylene
adipate-co-terephthalate)
(PBAT),
PE,
and
polypropylene
(PP),
representing
aromatic,
biodegradable,
aliphatic
plastics,
were
prepared
to
examine
their
photoreactivity.
Spectral
high-resolution
mass
spectrometry
analyses
revealed
that
PS/PET/PBAT-DOM
contained
more
unsaturated
aromatic
components,
whereas
PE/PP-DOM
was
richer
saturated
components.
Photodegradation
experiments
observed
molecules
prone
be
degraded
compared
molecules,
leading
higher
degradation
than
PE/PP-DOM.
mainly
by
hydroxyl
(•OH)
via
attacking
structures,
singlet
oxygen
(1O2)
through
oxidizing
side
chains.
The
[•OH]ss
1.21–1.60
×
10–4
M
0.97–1.14
PE/PP-DOM,
while
[1O2]ss
0.90–1.35
10–12
0.33–0.44
M,
respectively.
This
contributes
stronger
with
degree
photodegradation
reflected
decreasing
tendency
aromatic-unsaturated
aliphatic-saturated
molecules.
Special
attention
should
paid
environmental
impacts
associated
containing
highly
compounds.
Environmental Science & Technology,
Год журнала:
2022,
Номер
56(24), С. 17785 - 17794
Опубликована: Дек. 6, 2022
Iron
(hydr)oxides
as
a
kind
of
natural
mineral
actively
participate
in
the
transformation
organic
pollutants,
but
there
is
large
knowledge
gap
their
impacts
on
photochemical
processes
microplastics
(MPs).
This
study
first
to
examine
degradation
two
ordinary
plastic
materials,
polyethylene
(PE)
and
polypropylene
(PP),
mediated
by
iron
(goethite
hematite)
under
simulated
solar
light
irradiation.
Both
significantly
promoted
MPs
(particularly
PP)
with
greater
effect
goethite
than
hematite,
related
hydroxyl
radical
(•OH)
produced
(hydr)oxides.
Under
irradiation,
surface
Fe(II)
phase
catalyzed
production
H2O2
release
Fe2+,
leading
subsequent
light-driven
Fenton
reaction
which
amount
•OH.
As
were
modified
NaF
at
various
concentrations,
activity
well
Fe2+
greatly
reduced,
thus
•OH
formation
MP
depressed
remarkably.
It
worth
noting
that
groups
(especially
≡FeOH)
affected
kinetics
regulating
Fe
species.
These
findings
unveil
distinct
intrinsic
mechanisms
influencing
photodegradation
MPs.
