Nano Letters,
Год журнала:
2024,
Номер
24(43), С. 13686 - 13694
Опубликована: Окт. 16, 2024
Nanoconfined
interlayer
channels
in
two-dimensional
(2D)
laminates
are
promising
for
the
construction
of
novel
permselective
membranes.
Controlling
spacing
and
modifying
chemical
microenvironment
effective
high-efficiency
separation.
However,
manipulating
ion-diffusion
energy
barriers
confined
is
challenging,
their
role
selective
water–ion
transport
unclear.
This
study
engineered
sodium-ion
traps
(SITs)
graphene
oxide
(GO)
by
incorporating
N-phenylaza-15-crown-5
(NPCE)
to
regulate
barriers.
Partial
reduction
GO
enhanced
membrane
stability
enabled
precise
adjustment
spacing,
while
addition
NPCE
further
constricted
free
space
entrapped
sodium
ions
increasing
The
optimized
with
NPCE-dominated
SITs
achieved
mono/monovalent-ion
efficient
sieving
(K+/Na+
≈
10.2,
Li+/Na+
6.7)
rejection
Na2SO4
(∼99.0%)
NaCl
(∼90.0%),
maintaining
stable
performance
>1500
h.
findings
provide
new
insights
into
other
2D
material
laminates.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Апрель 29, 2024
Abstract
Two-dimensional
metal-organic
frameworks
(MOFs)
have
a
wide
variety
of
applications
in
molecular
separation
and
other
emerging
technologies,
including
atomically
thin
electronics.
However,
due
to
the
inherent
fragility
strong
interlayer
interactions,
high-quality
MOF
crystals
atomic
thickness,
especially
isolated
crystal
monolayers,
not
been
easy
prepare.
Here,
we
report
self-condensation-assisted
chemical
vapour
deposition
growth
single-crystals,
yielding
monolayer
single-crystals
poly[Fe(benzimidazole)
2
]
up
62
μm
grain
sizes.
By
using
transmission
electron
microscopy
high-resolution
force
microscopy,
high
crystallinity
atomic-scale
single-crystal
structure
are
verified
flakes.
Moreover,
integrating
such
MOFs
with
MoS
construct
ultrathin
van
der
Waals
heterostructures
is
achieved
by
direct
onto
,
enables
highly
selective
ammonia
sensing.
These
demonstrations
signify
great
potential
method
facilitating
development
fabrication
application
crystals.
Industrial & Engineering Chemistry Research,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Carbon
dioxide
(CO2)
separation
plays
a
vital
role
in
environmental
protection
and
resource
reuse.
A
potential
approach
to
achieving
satisfactory
CO2
is
combining
the
benefits
of
ionic
liquids
(ILs)
membranes.
In
this
work,
IL-LDH
nanosheets
were
obtained
by
functionalized
IL
modifying
layered
double
hydroxides
(LDH)
used
construct
Pebax/IL-LDH
mixed
matrix
membranes
(MMMs).
The
X-ray
diffraction
(XRD),
Fourier
transform
infrared
(FTIR)
spectroscopy,
photoelectron
spectroscopy
(XPS)
spectra
analysis
displayed
that
was
successfully
grafted
LDH
nanosheets.
characterizations
MMMs
showed
introduction
reduces
crystallinity
Pebax
membrane,
there
are
hydrogen
bond
interactions
between
fillers
Pebax.
modification
strengthens
with
better
affinity
improves
interfacial
compatibility
LDH.
Meanwhile,
CO2-philic
nanochannels
formed
slits
facilitate
transport
MMMs.
Such
inherent
properties
conjunctly
contribute
improvement
performance
optimum
Pebax/IL(20)-LDH
MMM
has
high
permeability
∼388
barrer
at
30
°C,
which
approximately
2.9
times
pure
Pebax,
CO2/CH4
selectivity
does
not
change
significantly.
Besides,
exhibited
notable
increase
as
working
temperature
increased,
ultimately
attaining
∼576
50
°C.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Дек. 30, 2024
Two-dimensional
(2D)
metal-organic
framework
(MOF)
nanosheet
membranes
hold
promise
for
exact
molecular
transfer
due
to
their
structural
diversity
and
well-defined
in-plane
nanochannels.
However,
achieving
precise
regulation
of
stacking
modes
between
neighboring
nanosheets
in
membrane
applications
understanding
its
influence
on
separation
performance
remains
unrevealed
challenging.
Here,
we
propose
a
strategy
accurately
controlling
the
MOF
via
linker
polarity
regulation.
Both
theoretical
calculations
experimental
results
demonstrate
that
high
promotes
maximum
AB
steric
hindrance
effects,
leading
controlled
effective
pore
size
consequently
improved
sieving.
Among
series
CuBDC-based
2D
MOFs
with
different
linkers,
CuBDC-NO
