Angewandte Chemie,
Год журнала:
2024,
Номер
136(35)
Опубликована: Июнь 19, 2024
Abstract
Plastic
pollution
is
worsening
the
living
conditions
on
Earth,
primarily
due
to
toxicity
and
stability
of
non‐biodegradable
plastics
(NBPs).
Photocatalytic
cracking
NBPs
emerging
as
a
promising
way
cleave
inert
C−C
bonds
abstract
carbon
atoms
from
these
wastes
into
valuable
chemicals
fuels.
However,
controlling
processes
huge
challenge,
ascribed
complicated
reactions
various
NBPs.
Herein,
we
summarize
recent
advances
in
CO
2
carbon‐radical‐mediated
photocatalytic
NBPs,
with
an
emphasis
pivotal
intermediates.
The
‐mediated
proceeded
indiscriminate
C−H/C−C
bond
cleavage
tandem
photoreduction
,
while
was
realized
by
prior
activation
C−H
for
selective
Catalytic
generation
conversion
different
intermediates
greatly
depend
kinds
active
species
structure
photocatalysts
under
irradiation.
Meanwhile,
fate
specific
intermediate
compared
small
molecule
reveal
key
problems
Finally,
challenges
potential
directions
are
discussed
improve
overall
efficiency
Compounds,
Год журнала:
2025,
Номер
5(1), С. 4 - 4
Опубликована: Фев. 3, 2025
The
depletion
of
fossil
fuels
and
environmental
concerns
have
driven
the
development
sustainable
materials,
including
bio-based
biodegradable
plastics,
as
alternatives
to
conventional
plastics.
Although
these
plastics
aid
in
waste
management
climate
change
mitigation,
their
vulnerability
oxidative
degradation
impacts
longevity,
durability,
performance.
Natural
antioxidants
such
tocopherols,
flavonoids,
tannins,
extracted
from
plants
or
agri-food
waste,
present
a
alternative
synthetic
stabilizers
by
enhancing
thermal
stability
polymers
like
poly(lactic
acid)
(PLA),
poly(butylene
succinate)
(PBS),
succinate-adipate)
(PBSA),
adipate-co-terephthalate)
(PBAT),
poly(hydroxyalkanoate)
(PHA),
starch-based
materials.
This
review
highlights
recent
advances
stabilized
with
natural
antioxidants,
mechanisms
action,
role
improving
material
properties
for
applications
packaging.
Additionally,
it
explores
impact
on
recycling
processes,
advancements
composite
production
techniques,
future
research
directions.
Bioplastics
can
achieve
enhanced
performance,
reduce
support
circular
economy
incorporating
antioxidants.
This
review
highlights
recent
advancements
in
TiO
2
photocatalysts,
emphasizing
key
strategies
to
enhance
their
performance
for
environmental
remediation
and
energy
conversion
technologies.
Journal of Polymer Science,
Год журнала:
2024,
Номер
62(17), С. 3920 - 3928
Опубликована: Май 22, 2024
Abstract
The
ability
to
revert
polymers
their
original
monomers
represents
a
crucial
chemical
recycling
technique,
promoting
sustainability
and
offering
the
chance
convert
used
materials
into
valuable
products.
In
recent
years,
numerous
studies
have
explored
use
of
synthesized
via
reversible
deactivation
radical
polymerization
(RDRP)
techniques
facilitate
efficient
depolymerization
reactions.
Herein,
we
report
photocatalyst,
zinc
tetraphenylporphyrin
(ZnTPP),
along
with
light
irradiation
accelerate
prepared
by
addition‐fragmentation
chain
transfer
(RAFT)
polymerization.
We
explore
various
parameters
affecting
efficiency,
including
solvents,
reaction
temperature
(80,
100,
120°C),
presence
photocatalysts
(ZnTPP
Eosin
Y),
type
RAFT
end‐groups,
namely
trithiocarbonate,
dithiobenzoate,
1
H
‐pyrazole‐1‐carbodithioate.
For
instance,
when
PMMA
was
diluted
25
mM
in
1,4‐dioxane
heated
120°C
under
green
ZnTPP
(200
ppm),
rapid
exceeding
70%
occurred
within
h.
Without
ZnTPP,
similar
conditions,
required
over
8
h
achieve
slightly
lower
yield.
Furthermore,
this
method
confers
moderate
oxygen
tolerance
system,
enabling
proceed
without
need
deoxygenation,
albeit
at
rate
consequently
lesser
monomer
recovery
(31%).
ACS Macro Letters,
Год журнала:
2024,
Номер
13(7), С. 806 - 811
Опубликована: Июнь 10, 2024
Thermal
solution
depolymerization
is
a
promising
low-temperature
chemical
recycling
strategy
enabling
high
monomer
recovery
from
polymers
made
by
controlled
radical
polymerization.
However,
current
methodologies
predominantly
focus
on
the
of
monofunctional
polymers,
limiting
material
scope
and
pathways.
Herein,
we
report
telechelic
synthesized
RAFT
Notably,
observed
significant
decrease
in
molecular
weight
(Mn)
during
recovery,
which
contrasts
minimal
Mn
shift
polymers.
Introducing
Z
groups
at
center
or
both
ends
polymer
resulted
distinct
kinetic
profiles,
indicating
partial
bifunctional
as
supported
mathematical
modeling.
Remarkably,
featuring
R-terminal
showed
up
to
68%
improvement
overall
conversion
compared
their
analogues,
highlighting
potential
these
materials
circular
economy.
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(35)
Опубликована: Июнь 19, 2024
Plastic
pollution
is
worsening
the
living
conditions
on
Earth,
primarily
due
to
toxicity
and
stability
of
non-biodegradable
plastics
(NBPs).
Photocatalytic
cracking
NBPs
emerging
as
a
promising
way
cleave
inert
C-C
bonds
abstract
carbon
atoms
from
these
wastes
into
valuable
chemicals
fuels.
However,
controlling
processes
huge
challenge,
ascribed
complicated
reactions
various
NBPs.
Herein,
we
summarize
recent
advances
in
CO
European Polymer Journal,
Год журнала:
2024,
Номер
220, С. 113429 - 113429
Опубликована: Сен. 2, 2024
Despite
significant
advancements
in
thermal
and
photothermal
depolymerizations,
the
success
of
these
techniques
relies
on
tedious
deoxygenation
procedures.
Herein,
we
report
development
depolymerization
technique
efficient
without
prior
deoxygenation,
which
was
enabled
by
copper/ligand
complexes
inclusion
(0.25
wt%
relative
to
solvent)
zinc
oxide
(ZnO)
nanocrystals
activated
UV
light.
This
approach
tested
for
poly(methyl
methacrylate)
(PMMA)
prepared
atom
transfer
radical
polymerization
(ATRP);
effects
solvent
polarity
activity
ligands
were
investigated.
Unexpectedly,
a
low-activity
Cu-complex
with
2,2'-bipyridyne
ligand,
combination
low-polarity
solvent,
1,2,4-trichlorobenzene,
relatively
high
yields
less
than
1
h
at
150
°C.
Higher
ATRP
tris(2-pyridylmethyl)amine
(TPMA)
N,N,N',N'',N''-pentamethyldiethylenetriamine
(PMDETA)
ligands,
efficient,
associated
their
decomposition
and/or
excessive
formation
radicals
premature
termination
chain
ends.
The
presented
facile
designed
be
used
even
partially
aerated
reactors,
opening
new
avenues
depolymerization.
The Science of The Total Environment,
Год журнала:
2024,
Номер
954, С. 176832 - 176832
Опубликована: Окт. 9, 2024
Microplastics
(MPs)
are
considered
one
of
the
most
widespread
pollutants
in
all
ecosystems
worldwide.
In
environment,
MPs
can
undergo
hydrolysis
and/or
oxidation,
resulting
release
low-molecular
weight
degradation
products,
along
with
additives,
and
adsorbed
organic
pollutants.
this
study,
morphological,
chemical,
thermal
changes
microplastics
obtained
from
two
biodegradable
plastics,
polylactic
acid
Mater-Bi®,
a
recycled
plastic,
recycled-polyethylene
terephthalate,
were
examined
after
accelerated
ageing
under
photo-oxidative
conditions
synthetic
seawater
Solarbox
system,
treatment
dark.
Thermal
properties
studied
by
thermogravimetric
analysis,
differential
scanning
calorimetry,
evolved
gas
analysis-mass
spectrometry.
Compositions
chemical
components
polymers
evaluated
attenuated
total
reflection-Fourier
transform
infrared
spectroscopy
pyrolysis-gas
chromatography-mass
The
leachable
fractions
products
released
degraded
characterized
This
study
allowed
us
to
identify
as
main
pathway
characterize
not
only
oligomers
water
consequence
degradation,
but
also
additives
used
plastic
item
formulations.
improves
our
understanding
these
polymers'
behavior
conditions.
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 2, 2025
Abstract
Plastic
products
bring
convenience
to
various
aspects
of
the
daily
lives
due
their
lightweight,
durability
and
versatility,
but
massive
accumulation
post‐consumer
plastic
waste
is
posing
significant
environmental
challenges.
Catalytic
methods
can
effectively
convert
into
value‐added
feedstocks,
with
catalysts
playing
an
important
role
in
regulating
yield
selectivity
products.
This
review
explores
latest
advancements
advanced
applied
thermal
catalysis,
microwave‐assisted
photocatalysis,
electrocatalysis,
enzymatic
catalysis
reaction
systems
for
chemical
recycling
valuable
feedstocks.
Specifically,
pathways
mechanisms
involved
plastics
process
are
analyzed
presented,
strengths
weaknesses
employed
across
different
described.
In
addition,
structure‐function
relationship
these
discussed.
Herein,
it
provided
insights
design
novel
outline
challenges
future
opportunities
terms
developing
tackle
“white
pollution”
crisis.
