Chemosphere,
Journal Year:
2022,
Volume and Issue:
309, P. 136809 - 136809
Published: Oct. 10, 2022
This
work
aims
at
evaluating
the
fate
of
microplastics
(MPs)
along
Fenton
oxidation.
For
such
goal,
realistic
MPs
(150-250
μm)
five
representative
polymer
types
(PET,
PE,
PVC,
PP
and
EPS)
were
obtained
from
commercial
plastic
products
by
cryogenic
milling.
Experiments
(7.5
h)
performed
under
relatively
severe
operating
conditions:
T
=
80
°C;
pH0
3;
[H2O2]0
1000
mgL-1
(15
doses,
1
every
0.5
h);
[Fe3+]0
10
(5
1.5
h).
Slight
weight
losses
(∼10%)
achieved
after
oxidation
regardless
MP
nature.
Nevertheless,
yield
clearly
increased
with
decreasing
particle
size
given
their
higher
exposed
surface
area
(up
to
20%
loss
20-50
μm
EPS
MPs).
Clearly,
suffered
important
changes
in
due
introduction
oxygenated
groups,
which
made
them
more
acidic
hydrophilic.
Furthermore,
progressively
reduced
size.
In
fact,
they
can
be
completely
oxidized
CO2,
as
demonstrated
PS
nanoplastics
(140
nm),
where
70%
mineralization
was
achieved.
The
nature
particles
had
a
relevant
impact
on
its
overall
oxidation,
being
prone
those
polymers
contain
aromatic
rings
structures
(EPS
PET)
compared
formed
alkane
chains
(PE,
PVC).
latter,
presence
substituents
also
potential.
Remarkably,
possible
leachates
released
reaction
quickly
than
MPs/NPs,
so
it
assumed
that
these
dissolved
compounds
would
removed
once
solid
are
eliminated.
Notably,
upon
biodegradable
fresh
solids.
All
this
knowledge
is
crucial
for
understanding
process
opens
door
design
optimization
technology
either
water
treatment
or
analytical
purposes
(MPs
isolation).
TrAC Trends in Analytical Chemistry,
Journal Year:
2024,
Volume and Issue:
172, P. 117566 - 117566
Published: Jan. 30, 2024
The
analysis
of
microplastics
(MPs)
in
terrestrial
environments
and
the
evaluation
their
environmental
risk
has
gained
great
attention,
owing
to
increasing
evidence
for
widespread
presence
soils
freshwater
sediments
globally.
Once
environment,
MPs
undergo
abiotic
biotic
processes
which
alter
properties
integrity:
this
process
is
called
"aging"
implications
fate
these
contaminants,
morphology
surface
chemistry.
Aging
may
also
affect
analytical
assessment
samples:
samples
likely
contain
aged
MPs,
while
methods
are
generally
established
using
pristine
plastics
validation.
This
can
lead
uncertainties
quantification
characterization.
critical
review
summarizes
current
trends
simulation
characterization
MP
aging
laboratory
conditions,
highlighting
limitations
knowledge
gaps.
It
discusses
challenges
induced
by
samples,
providing
directions
toward
possible
solutions.
Desalination and Water Treatment,
Journal Year:
2024,
Volume and Issue:
317, P. 100138 - 100138
Published: Jan. 1, 2024
In
this
study,
the
literature
has
been
reviewed
for
following
purposes:
(1)
to
summarize
land-based
and
marine-based
sources
of
microplastics
(MPs)
in
marine
environment,
(2)
evaluate
abundance
MPs
waters
factors
affecting
MP
waters,
(3)
review
general
polymer
types,
shapes,
sizes
colors
determine
dominant
characteristics
(4)
reveal
negative
effects
on
various
organisms
(phytoplankton,
zooplankton,
corals,
fish,
sea
turtles,
seabirds).
This
present
provides
an
overview
sources,
abundance,
which
may
guide
future
plastic/MP
pollution
management
strategies
improvement
removal
methods
from
waters.
Additionally,
highlights
presence
organism
environment
organisms.
