Water,
Journal Year:
2024,
Volume and Issue:
17(1), P. 74 - 74
Published: Dec. 31, 2024
Microplastics
(MPs)
can
serve
as
vectors
for
heavy
metals
in
aquatic
environments;
however,
the
adsorption
behavior
of
MPs
on
multiple
metal
systems
is
still
unclear.
This
study
investigated
characteristics
biodegradable
poly
(butylene
succinate)
(PBS)
cadmium
(Cd(II))
and
arsenic
(As(III))
both
single
binary
systems.
Adsorption
isotherms
were
studied
using
Linear,
Langmuir,
Freundlich
models,
further
analysis
was
conducted
site
energy
distribution
theory
density
functional
theory.
The
results
indicate
that
maximum
capacities
PBS
Cd(II)
As(III)
are
2.997
mg/g
2.606
mg/g,
respectively,
with
model
providing
best
fit,
suggesting
multilayer
heterogeneous
sites.
has
a
higher
affinity
than
Cd(II),
binding
−11.219
kcal/mol.
Additionally,
mechanisms
include
electrostatic
interactions
surface
complexation,
primary
sites
at
C=O
carboxyl
group
hydroxyl
group.
comprehension
interfacial
between
plastics
facilitated
by
combination
theoretical
calculations
experimental
investigations.
Biodegradable
plastics
(BPs)
are
promoted
as
eco-friendly
alternatives
to
conventional
plastics.
However,
compared
microplastics
(MPs),
they
degrade
rapidly
into
biodegradable
(BMPs),
which
may
lead
a
more
significant
accumulation
of
BMPs
in
the
environment.
This
review
systematically
compares
and
MPs,
summarizes
current
knowledge
on
their
environmental
behaviors
impacts
ecosystems
human
health,
offers
recommendations
for
future
research.
detected
water,
sediments,
indoor
dust,
food,
marine
organisms,
samples.
Compared
prone
transformations,
such
photodegradation
biodegradation,
results
shorter
migration
distance
across
different
matrices.
Like
can
adsorb
pollutants
transport
them
enhancing
toxicity
health
risks
through
Trojan
horse
effect.
Studies
indicate
that
negatively
impact
terrestrial
aquatic
than
MPs
by
disrupting
nutrient
cycling
inhibiting
plant
animal
growth.
In
vivo
vitro
research
also
shows
BMP
degradation
products
increase
bioavailability,
exacerbating
neurotoxicity
overall
toxicity.
findings
BMPs'
effects
remain
inconsistent.
Further
evaluation
trade-offs
between
biodegradability
is
needed
address
these
uncertainties.
The Science of The Total Environment,
Journal Year:
2024,
Volume and Issue:
935, P. 173429 - 173429
Published: May 22, 2024
The
occurrence
and
persistence
of
microplastics
(MPs)
in
natural
environments
are
increasing
concern.
Along
with
this,
the
transport
MPs
sediments
has
been
investigated
mainly
focusing
on
effect
plastic
size
shape,
media
effect,
solution
chemistry.
Yet,
influence
particle
density
is
only
partially
understood.
Therefore,
column
experiments
variably
buoyant
saturated
glass
beads
were
conducted,
parameters
quantified
using
a
two-site
kinetic
model
depth-dependent
blocking
function
(the
amount
retained
does
not
decrease
at
constant
rate
depth,
majority
near
inlet).
Neutral,
sinking,
within
same
range
selected,
stable
water
isotope
applied
as
conservative
tracer
to
explore
MP
movement
tested
sediments.
results
showed
that
95.5
±
1.4%
sinking
remained
columns
packed
gravel,
followed
by
neutral
MPs,
thus
indicating
affect
mobility.
Similar
recovered
amounts
found
beads,
sediment
types
do
deposition
behavior
MPs.
breakthrough
curves
accurately
described
selected
model.
However,
simulated
retention
profiles
overestimated
observed
layers
closest
inlet.
coupled
experimental
modeled
suggest
an
enhanced
while
neutrally
exhibit
higher
mobility
comparison.
Thus,
or
can
potentially
pose
contamination
risk
subsurface
porous
compared
Discrepancies
between
indicate
future
development
needed
for
advancing
affected
density.
