A cation-gating mechanism for enhanced CO2/N2 separation by porous nanostructure supported ionic liquid membrane
The Journal of Chemical Physics,
Год журнала:
2025,
Номер
162(9)
Опубликована: Март 6, 2025
2D
porous
material
supported
ionic
liquid
membranes
(SILMs)
have
demonstrated
great
potential
for
CO2
separation
and
purification,
outperforming
the
original
material.
However,
working
mechanism
behind
their
enhanced
selectivity
remains
unclear.
In
this
study,
we
conducted
molecular
dynamics
simulation
to
investigate
CO2/N2
performance
underlying
of
SILMs
taking
rhombic
N-graphdiyne
(r-N-GDY)
with
intrinsic
high
thermal
stability
structure
covered
1-butyl-3-methylimidazolium
tetrafluoroborate
as
representative
SILM
model.
We
found
that
increase
in
thickness
can
decrease
permeance
N2
but
effectively
selectivity.
The
optimal
is
be
0.6
nm
reaching
5.7
×
105
GPU
being
up
25.8,
which
15
times
higher
than
1.7
bare
r-N-GDY.
This
because
encounters
a
much
lower
transmembrane
energy
barrier
N2.
At
level,
it
fascinating
observe
cation-gating
mechanism,
where
IL
cations
play
determinative
role
More
specifically,
normally
bind
at
pore
site,
like
closed
gate
gas.
When
molecule
approaches
pore,
cation
moves
away;
thus,
opened
translocation.
contrast,
molecules
are
incapable
opening
gate.
Such
process
guarantees
SILMs.
study
offers
insight
into
provides
theoretical
guidance
designing
nanocomposite
gas
or
water
treatment.
Язык: Английский
Multicomponent Nacre-Like Heterogeneous Nanochannels with Ion Sieving and Light-Sensitivity Properties for Improved Energy Conversion
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
17(19), С. 28693 - 28703
Опубликована: Май 3, 2025
Nanochannel
membranes
are
currently
being
employed
for
selective
ion
transport
and
salinity
gradient
energy
capture.
However,
the
poor
functionality
of
nanochannel
unfavorable
influence
multivalent
cations
result
in
low
conversion
efficiency,
limiting
performance
membranes.
Herein,
multicomponent
nacre-like
heterogeneous
nanochannels
composed
carboxymethyl
chitosan
(CMC)-intercalated
composite
two-dimensional
(2D)
GO,
C3N4
nanosheets,
polyethylene
terephthalate
(PET)
channels
developed
using
an
interfacial
assembly
strategy.
Benefiting
from
asymmetric
structure,
membrane
achieves
enhanced
diffusion
unidirectional
behaviors.
Subsequently,
a
high
power
density
8.46
W/m2
is
achieved
artificial
seawater
river
water
by
membrane.
Notably,
introduction
CMC
into
2D
lamellar
endows
with
outstanding
sieving
performance,
thereby
mitigating
divalent
on
conversion,
reducing
it
32.08%
to
19.85%.
Furthermore,
exhibits
sensitive
stable
light-responsive
behavior,
profiting
light
sensitivity
GO
improvement
11.29%
can
be
accomplished
irradiation.
This
work
proposes
idea
design
multifunctional
achieve
highly
efficient
conversion.
Язык: Английский