Langmuir,
Journal Year:
2024,
Volume and Issue:
40(43), P. 22931 - 22944
Published: Oct. 15, 2024
The
deposition
of
nanoplastics
in
the
environment
poses
a
direct
threat
to
human
health
through
food
chain.
There
is
an
urgent
need
investigate
how
they
can
be
effectively
removed
from
water.
In
this
work,
toxic
effects
nanopolystyrene
(PS)
at
different
concentrations
on
Phaeodactylum
tricornutum
(PT)
were
investigated.
results
show
that
PS
affects
cell
activity
PT
wall
adhesion
and
shading
effect
hinders
transmission
light
energy,
thus
inhibiting
growth
PT.
Considering
living
not
suitable
for
removal
heterogeneous
aggregation
PS,
magnesium
silicate
(MS)
was
obtained
by
calcination
biomass
based
retaining
salt.
maximum
adsorption
capacity
MS
40.85
mg
g–1,
which
10
times
higher
than
conventional
adsorbents.
presence
competitive
anions
significantly
PS.
application
real
water
bodies
reusability
adsorbents
also
verified.
By
characterizing
materials
before
after
adsorption,
it
found
mechanism
mainly
includes
electrostatic
attraction,
hydrogen
bonding,
π–π
interaction,
complexation
between
Si–O
bond
This
study
explains
nano-PS
innovatively
develops
derivative
diatoms,
provides
novel
feasible
strategy
environmental
remediation.
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.
The Journal of Physical Chemistry C,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 10, 2025
Plastic
waste
is
a
major
environmental
issue;
converting
it
directly
into
valuable
chemicals
by
using
catalysts
promising
alternative
to
plastic
recycling.
Here,
we
report
the
selective
catalytic
cracking
of
polypropylene
(PP),
typical
commodity
plastic,
high-value
light
olefins
(C2–C5),
below
pyrolytic
temperature
(290
°C)
and
without
external
hydrogen
supply,
zeolite
catalysts.
Among
H+-form
zeolites
with
different
structures,
HMFI
showed
highest
yields
hydrocarbons
which
(C2–C5)
were
products.
The
HMFI-catalyzed
PP
conversion
was
applicable
upcycling
model
waste,
resulting
in
61.9%
hydrocarbon
yield.
results
situ
IR
experiments
small
amount
Brønsted
acid
sites
suggested
that
on
surface
are
indispensable
for
posited
be
active
short-chain
(oligomeric)
species
as
intermediate
Density
functional
theory
analyses
conducted
determine
plausible
reaction
pathways
adopting
2,4-dimethylheptene
shortest
unit
oligomeric
species.
obtained
show
β-scission
isobutene
propylene
(or
propyl
alkoxide
group)
via
carbocation
intermediates
an
activation
energy
118
kJ
mol–1.
Operando
UV–vis
under
conditions,
combined
ex
1H
NMR
13C
spent
catalyst,
some
further
converted
or
heavy
aromatics
(coke
deposit),
probably
carbenium
ion
Langmuir,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 4, 2025
Chemical
upcycling
of
polyethylene
(PE)
to
long-chain
alkylaromatics
through
tandem
hydrocracking/aromatization
has
potential
provide
value-added
chemicals.
However,
the
liquid
product
is
a
complex
mixture
alkanes,
alkylbenzenes,
and
polyaromatics,
limiting
its
direct
usability.
The
most
valuable
component
alkylbenzenes
because
their
as
precursors
anionic
surfactants.
In
this
study,
one-pot
reactive
separation
described.
Sulfonating
from
PE
with
silica
sulfuric
acid
followed
by
neutralization
sodium
hydroxide
yields
alkylbenzenesulfonates
(up
93
mol
%
selectivity),
along
separate
phase
lubricant-range
hydrocarbons
coproduct.
Compared
petroleum-based
dodecylbenzenesulfonates,
reported
PE-derived
surfactant
molecules
show
competitive
physicochemical
properties,
including
surface
tension
interfacial
tension.
According
life
cycle
assessment,
described
reaction
strategy
demonstrates
20%
lower
greenhouse
gas
emissions,
when
considering
uses
for
coproducts
upcycling,
compared
conventional
linear
(LAS)
manufacturing
directly
petrochemical
feedstocks.
Green Chemistry,
Journal Year:
2024,
Volume and Issue:
26(19), P. 10225 - 10231
Published: Jan. 1, 2024
The
highly
efficient
conversion
of
post-consumer
PE
waste
into
propylene
by
single
metal-catalyzed
isomerization-metathesis
(ISOMET)
opens
up
new
alternatives
for
persistent
plastic
upcycling.
Langmuir,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 3, 2024
Creating
and
unveiling
chiral
systems
is
important
to
the
development
of
new
materials
devices.
In
this
study,
after
depositing
prochiral
radical
molecule
3-carbamoyl-2,2,5,5-tetramethyl
pyrroline-1-oxyl
(CTPO)
on
a
Au(111)
substrate,
2D
molecular
crystals
with
two
chiralities
CTPO
molecules
have
been
discovered.
A
single
an
achiral
in
three-dimensional
space,
it
can
form
configurations
adsorbing
substrate.
The
originate
from
properties
adsorbed
their
assembling.
Molecules
different
are
connected
recognition
through
hydrogen
bond
interactions.
Through
density
functional
theory
simulations,
networks
structures
system
were
explored.
To
gain
further
understanding
system,
electronic
property
CTPO/Au(111)
was
studied
local
states
(LDOS)
characterization.
peculiar
LDOS
distribution
related
vibrational
excitation
mapped
at
submolecular
scale.
These
results
useful
for
nature
chirality
formation,
crystal
construction,
applications.
