Water,
Journal Year:
2024,
Volume and Issue:
16(5), P. 673 - 673
Published: Feb. 25, 2024
The
global
problem
of
microplastics
in
the
environment
is
“inspiring”
scientists
to
find
environmentally
friendly
and
economically
viable
methods
remove
these
pollutants
from
environment.
Advanced
oxidation
processes
are
among
most
promising
methods.
In
this
work,
potential
Fenton,
photo-Fenton,
Fenton-like
for
degradation
low-density
polyethylene
(LDPE),
polypropylene
(PP),
poly(vinyl
chloride)
(PVC)
water
suspensions
was
investigated.
influence
three
parameters
on
efficiency
process
tested:
pH
medium
(3–7),
mass
added
iron
(10–50
times
less
than
microplastics),
H2O2
(5–25
more
iron).
effectiveness
treatment
monitored
by
FTIR-ATR
spectroscopy.
After
60-min
treatments,
PP
microparticles
were
found
be
insensitive.
Fenton
PVC
photo-Fenton
LDPE
PVC,
changes
FTIR
spectra
related
observed.
cases,
optimized.
It
that
a
low
(3)
high
(optimal
values
1/12
1/10
respectively)
favored
all
three.
concentrations
(25
higher
iron),
while
significantly
lower
(11
15
treatment,
respectively),
suggesting
scavenging
activity
occurs.
Environmental Science & Technology,
Journal Year:
2024,
Volume and Issue:
58(31), P. 13973 - 13985
Published: July 24, 2024
The
fate
of
ubiquitous
microplastics
(MPs)
is
largely
influenced
by
dissolved
organic
matter
(DOM)
in
aquatic
environments,
which
has
garnered
significant
attention.
reactivity
DOM
reported
to
be
greatly
regulated
molecular
weights
(MWs),
yet
little
known
about
the
effects
different
MW
on
MP
aging.
Here,
aging
behavior
polystyrene
MPs
(PSMPs)
presence
fulvic
acids
(FAs)
and
humic
(HAs)
was
systematically
investigated.
Under
ultraviolet
(UV)
illumination,
O/C
PSMPs
aged
for
96
h
surged
from
0.008
0.146
lower
FA
(FA<1kDa)
treatment,
suggesting
PSMP
However,
exhibited
a
stronger
effect
facilitating
photoaging
than
HA,
can
attributed
fact
that
FA<1kDa
contains
more
quinone
phenolic
moieties,
demonstrating
higher
redox
capacity.
Meanwhile,
compared
other
fractions,
actively
involved
increase
reactive
species
yields
50–290%,
including
•OH,
plays
key
role
photoaging,
contributed
25%
electron-donating
capacity
(EDC).
This
study
lays
theoretical
foundation
better
understanding
environmental
MPs.
Water,
Journal Year:
2024,
Volume and Issue:
16(11), P. 1529 - 1529
Published: May 26, 2024
The
aging
behavior
of
microplastics
(MPs)
in
the
environment
has
garnered
significant
attention,
yet
exact
process
undergone
by
during
advanced
oxidation
still
remains
unclear.
This
study
emphasized
elucidating
and
dechlorination
mechanisms
polyvinyl
chloride
(PVC
MPs)
within
UV-activated
sodium
percarbonate
system
(UV/SPC).
After
35
h
UV/SPC
(0.05
M)
treatment,
it
exhibited
effective
with
a
Cl−
release
100.62
±
13.17
mg/L.
And
this
treatment
resulted
fragmentation
fragments
from
PVC
MPs,
thereby
contributing
to
their
further
dechlorination.
In
addition,
an
increase
oxygen-containing
functional
groups
was
identified.
Quenching
experiments
confirm
that
·OH
·CO3−
are
primary
active
species
present
system.
summary,
MPs
results
fragmentation,
releasing
more
fragile
susceptible
mineralization
compared
original
MPs.
ions
originates
these
released
·CO3−.
provided
valuable
insights
into
practical
wastewater
treatment.
