Covalent
organic
frameworks
(COFs)
have
emerged
as
highly
promising
materials
for
membrane
separations
due
to
their
high
porosity,
tunable
pore
sizes,
ordered
crystalline
structures,
and
exceptional
chemical
stability.
With
these
features,
COF
membranes
possess
greater
selectivity
permeability
than
conventional
materials,
making
them
the
preferred
choice
in
various
fields,
including
separations.
Fascinating
research
endeavors
encompassing
fabrication
strategies
COF-based
diverse
separation
applications.
Hence,
this
review
summarizes
latest
advancements
synthesis,
powders
continuous
applications
membranes.
Special
consideration
was
given
regulation
performance
optimization
of
applications,
such
size,
hydrophilicity/hydrophobicity,
surface
charge,
crystallinity,
Furthermore,
water
treatment,
metal
ion
separation,
solvent
nanofiltration,
gas
are
comprehensively
reviewed.
Finally,
results
future
prospects
development
discussed.
Future
may
be
focused
on
following
key
directions:
(1)
single-crystal
fabrication,
(2)
cost-effective
preparation,
(3)
subnanometer
engineering,
(4)
advanced
characterization
techniques,
(5)
AI-assisted
development.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(49)
Published: Aug. 9, 2024
Abstract
Biological
ion
channels
are
renowned
for
their
exceptional
transport
selectivity
and
adaptability
to
environmental
changes,
posing
a
significant
challenge
synthetic
mimicry.
Herein,
an
innovative
covalent–organic‐framework
membrane
featuring
aligned
benzothiadiazole
units
within
its
oriented
1D
nanochannels
is
reported.
These
densely
arrayed
dipolar
enhance
selective
adsorption
facilitate
charge
regulation.
Consequently,
the
can
dynamically
adjust
permselectivity
toward
ions,
transitioning
seamlessly
between
cation‐selective,
ambipolar,
anion‐selective
states.
This
versatility
affects
both
type
of
ions
transported
efficiency,
supporting
reversible
controlled
operation,
as
illustrated
by
capacity
regulate
magnitude
direction
osmotic
power.
When
interacting
with
multivalent
anions,
highly
negatively
charged
exhibit
outstanding
cation
conductivity.
Specifically,
upon
exposure
PO
4
3−
achieves
remarkable
power
155
W
m
−2
energy
conversion
efficiency
46.1%
under
salinity
gradients
0.5
0.01
NaCl.
Notably,
introducing
cations
reverse
polarity
membrane.
work
underscores
potential
exploiting
ion‐dipolar
interactions
development
adaptive,
ion‐selective
membranes
promising
applications
in
electrochemical
sensing,
conversion,
more.
Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(37), P. 11438 - 11445
Published: Sept. 6, 2024
Polymeric
membranes
with
high
permselective
performance
are
desirable
for
energy-saving
bioalcohol
separations.
However,
it
remains
challenging
to
design
membrane
microstructures
low-resistance
channels
and
a
thin
thickness
fast
alcohol
transport.
Herein,
we
demonstrate
highly
crystalline
covalent
organic
framework
(COF)
ordered
nanochannels
as
tunable
transport
layers
efficient
butanol/water
separation.
The
was
well-regulated
by
altering
the
concentration
molar
ratio
of
two
aldehyde
monomers
different
reactivity.
surface-integrated
poly(dimethylsiloxane)
produced
defect-free
hydrophobic
COF
membranes.
continuous
exhibited
an
exceptional
flux
up
18.8
kg
m
Advanced Energy Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 31, 2025
Abstract
The
advancement
of
nanofluidic
membranes
is
critical
for
mimicking
bioelectrogenic
ion‐channel
mechanisms
and
boosting
output
power
density,
essential
sustainable
energy
applications.
conversion
efficiency
these
devices
significantly
relies
on
the
ion
conductivity
permselectivity
membranes.
Membranes
with
aligned
one‐dimentional
(1D)
pores,
high
pore
organized
dangling
ionic
groups
are
theorized
to
offer
superior
permeability
selectivity,
yet
configurations
remain
underexplored.
Herein,
successful
fabrication
oriented
covalent
organic
framework
(COF)
presented.
These
exhibit
precisely
cationic
anionic
sites
within
their
channels,
achieved
through
post‐synthetic
modification
using
click
chemistry,
which
shows
conductivity.
When
incorporated
into
full‐cell
thermo‐osmotic
generators,
deliver
an
impressive
density
195
W
m
−2
under
a
50‐fold
salinity
gradient
(NaCl:
0.01
‖
0.5
)
along
35
K
temperature
differential.
This
substantially
increases
2.41
times
471
−2
when
enhanced
tenfold,
surpassing
performance
existing
similar
conditions
thus
offering
promising
avenue
enhancing
in
resource
utilization.
