Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 13, 2024
Abstract
Polystyrene
(
PS
)
is
a
commodity
plastic
recalcitrant
to
chemical
recycling
or
upcycling
processes.
Approaches
aimed
at
deconstructing
by
photocatalytic
means
struggle
generate
high‐energy
species
capable
of
cleaving
the
robust
C−H
and
C−C
bonds
.
We
show
that
9‐mesityl‐10‐methylacridinium
perchlorate
MA
various
grades
substrates
into
up
40
%
benzoic
acid
BAc
),
formic
FA
small
proportions
acetophenone
ACP
under
visible
light
(456
nm)
through
solar
radiation.
Time‐resolved
emission
absorption
spectroscopy
evidence
reaction
with
oxygen
primary
photochemical
step
in
oxygen‐saturated
solutions,
accounting
for
77
photons
absorbed
vs.
1
direct
(0.303
M
repeating
units).
These
results
are
agreement
mechanism
which
‐mediated
photo
occurs
abstraction
benzylic
H
atoms
reactive
generated
energy
electron
transfer
from
excited
state
Addition
triplet
O
2
these
radicals,
followed
intra‐
inter‐molecular
hydrogen
atom
(HAT)
generates
C‐
O‐centered
radicals
then
undergoing
β‐scission
hydroperoxide
fragmentation.
The
formation
intermediate
oligomers
functionalized
terminal
carbonyl
groups
demonstrated
both
infrared
analysis
MALDI
TOF
mass
spectrometry.
undergo
further
photoinduced
conversion
even
absence
,
as
evidenced
size
exclusion
chromatography
irradiated
samples.
Chemical Society Reviews,
Journal Year:
2024,
Volume and Issue:
53(14), P. 7309 - 7327
Published: Jan. 1, 2024
Oxidative
degradation
is
a
powerful
method
to
degrade
plastics
into
oligomers
and
small
oxidized
products.
While
thermal
energy
has
been
conventionally
employed
as
an
external
stimulus,
recent
advances
in
photochemistry
have
enabled
photocatalytic
oxidative
of
polymers
under
mild
conditions.
This
tutorial
review
presents
overview
degradation,
from
its
earliest
examples
emerging
strategies.
briefly
discusses
the
motivation
development
with
focus
on
underlying
mechanisms.
Then,
we
will
examine
modern
studies
primarily
relevant
catalytic
degradation.
Lastly,
highlight
some
unique
using
unconventional
approaches
for
polymer
such
electrochemistry.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(37)
Published: June 17, 2024
Abstract
The
photocatalytic
conversion
of
biomass
and
plastic
waste
provides
opportunities
for
sustainable
fuel
chemical
production.
Heterogeneous
photocatalysts,
typically
composed
semiconductors
with
distinctive
redox
properties
in
their
conduction
band
(CB)
valence
(VB),
facilitate
both
the
oxidative
reductive
valorization
organic
feedstocks.
This
article
a
comprehensive
overview
recent
advancements
photorefinery
plastics
from
perspective
photocatalysts.
We
explore
roles
VB
CB
enhancing
value‐added
via
various
pathways.
Our
aim
is
to
bridge
gap
between
mechanisms
renewable
carbon
feedstock
valorization,
inspiring
further
development
refinery
plastics.
Energy & Environmental Science,
Journal Year:
2024,
Volume and Issue:
17(18), P. 6435 - 6481
Published: Jan. 1, 2024
Active
sites
play
a
pivotal
role
in
photo/electrocatalysis,
particularly
the
transition
from
fossil
fuels
to
clean,
efficient
and
renewable
energy
sources.
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 29, 2025
Photocatalytic
upcycling
of
waste
polyolefins
into
value-added
chemicals
provides
promise
in
plastic
management
and
resource
utilization.
Previous
works
demonstrate
that
can
be
converted
carboxylic
acids,
with
CO2
as
the
final
oxidation
product.
It
is
still
challenging
to
explore
more
transformation
products,
particularly
mild-oxidation
products
such
alcohols,
because
their
instability
compared
polymer
substrates,
which
are
prone
during
catalytic
reactions.
In
this
work,
we
propose
an
efficient
strategy
regulate
product
type
through
precise
control
radicals,
intermediates,
reaction
paths.
Taking
commonly
used
photocatalyst
C3N4
example,
its
major
acids
CO2.
When
MoS2
introduced
construct
a
Z-scheme
heterostructure,
gas
significantly
reduced
alcohols
appear
high
yield
1358.8
μmol
gcat-1
selectivity
up
80.3%.
This
primarily
attributed
presence
•OH
radicals
from
oxygen
reduction,
acting
key
role
alcohol
formation
while
simultaneously
suppressing
competing
pathways
•O2-
1O2,
thus
reducing
overoxidation
products.
The
β-scission
C-C
bonds
chains
generates
intermediate
alkyl
species,
followed
by
combination
produce
methanol,
energetically
favorable
for
MoS2/C3N4.
contrast,
species
couple
form
formic
acid,
C3N4.
work
new
approaches
controlling
types
offers
insights
involved
polyolefin
photorefinery.
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: June 4, 2024
Abstract
This
study
examines
the
presence
of
bisphenol
A
(BPA),
S
(BPS),
F
(BPF),
and
M
(BPM)
in
various
recycled
plastics
readily
available
on
market
(LDPE,
HDPE,
PET,
PP),
light
European
Food
Safety
Authority
(EFSA)
limits.
Twenty
samples
different
origin
are
analyzed,
cleaning
treatments
applied,
migration
potential
these
bisphenols
into
food
is
studied.
BPM
absent
all
samples,
but
a
post-consumer
LDPE
sample
reveals
high
concentrations,
raising
concerns,
reaching
8540
ng/g,
370
29
ng/g
BPA,
BPS,
BPF,
respectively.
Migration
tests
show
substantial
contaminants
simulants.
Using
treatment
with
polyethylene
glycol
(PEG
400)
reduces
BPA
LDPE,
PP,
PET
by
95%,
99%,
97%
28%,
respectively,
highlighting
importance
across
polymers
plastic
recycling.
These
findings
not
only
protect
safety
addressing
environmental
challenges
associated
