Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
63(6)
Published: Nov. 28, 2023
Ion-selective
membranes
are
crucial
in
various
chemical
and
physiological
processes.
Numerous
studies
have
demonstrated
progress
separating
monovalent/multivalent
ions,
but
efficient
monovalent/monovalent
ion
sieving
remains
a
great
challenge
due
to
their
same
valence
similar
radii.
Here,
this
work
reports
two-dimensional
(2D)
MXene
membrane
with
super-aligned
slit-shaped
nanochannels
ultrahigh
monovalent
selectivity.
The
is
prepared
by
applying
shear
forces
liquid-crystalline
(LC)
dispersion,
which
conducive
the
highly-ordered
stacking
of
nanosheets.
obtained
LC
(LCMM)
exhibits
selectivities
toward
Li
Journal of Agricultural and Food Chemistry,
Journal Year:
2024,
Volume and Issue:
unknown
Published: April 11, 2024
In
an
effort
to
make
pesticide
use
safer,
more
efficient,
and
sustainable,
micro-/nanocarriers
are
increasingly
being
utilized
in
agriculture
deliver
pesticide-active
agents,
thereby
reducing
quantities
improving
effectiveness.
the
of
nanopesticides,
choice
further
design
prepare
stimulus-responsive
nanocarriers
based
on
changes
plant
growth
environment
(light,
temperature,
pH,
enzymes,
etc.)
has
received
attention
from
researchers.
Based
this,
this
paper
examines
recent
advancements
nanomaterials
for
micro-/nanocarriers.
It
delves
into
intricacies
preparation
methods,
material
enhancements,
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 9, 2025
Abstract
Coupling
ion
exclusion
and
interaction
screening
within
sub‐nanoconfinement
channels
in
novel
porous
material
membranes
hold
great
potential
to
realize
highly
efficient
sieving,
particularly
for
high‐performance
lithium‐ion
extraction.
Diverse
kinds
of
advanced
have
been
previously
reported
this
goal
but
with
moderate
performance
complex
operations
gained.
Herein,
these
issues
are
circumvented
by
preparing
the
consecutive
intact
imine‐linked
three‐dimensional
covalent
organic
framework
(i.e.,
COF‐300)
via
a
simple
solvothermal
approach
employing
intrinsically
interconnected
sub‐1
nm
one‐dimensional
exceptional
sieving.
The
synthesized
charged
angstrom
scale
≈0.78
achieve
an
excellent
Li
+
permeance
(0.123
mol
m
−2
h
−1
)
ultrahigh
/Mg
2+
36
binary
system.
experimental
measurement
theoretical
calculation
reveal
that
channel
size
right
exactly
between
Mg
enables
restricted
penetration.
Meanwhile,
affinity
imine
groups
further
strengthens
fast
permeability
severely
suppresses
passage.
In
particular,
framwork
also
remarkable
separation
during
long‐term
operation
test
without
sacrificing
trade‐off,
demonstrating
chemistry
stability
mechanical
integrity
under
high‐salinity
aqueous
environment.
Nature Communications,
Journal Year:
2022,
Volume and Issue:
13(1)
Published: June 13, 2022
Increasing
the
charge
density
of
ionic
membranes
is
believed
to
be
beneficial
for
generating
high
output
osmotic
energy.
Herein,
we
systematically
investigated
how
membrane
populations
affect
permselectivity
by
decoupling
their
effects
from
impact
pore
structure
using
a
multivariate
strategy
constructing
covalent-organic-framework
membranes.
The
thermo-osmotic
energy
conversion
efficiency
improved
increasing
density,
affording
210
W
m-2
with
temperature
gradient
40
K.
However,
this
enhancement
occurs
only
within
narrow
window,
and
subsequently,
plateaued
beyond
threshold
(0.04
C
m-2).
complex
interplay
between
pore-pore
interactions
in
response
variations
ion
transport
across
upscaled
nanoporous
helps
explain
obtained
results.
This
study
has
far-reaching
implications
rational
design
augment
extraction
rather
than
intuitively
focusing
on
achieving
densities.
AIChE Journal,
Journal Year:
2022,
Volume and Issue:
68(6)
Published: April 2, 2022
Abstract
Lithium
demands
increase
dramatically
and
make
it
highly
attractive
to
develop
advanced
ion
separation
technology/material.
However,
high
Mg
2+
/Li
+
ratio
impedes
the
extraction
due
difficulties
in
of
two
ions.
Here,
we
propose
an
ion‐“distillation”
technology
based
on
electro‐membrane
stacking
for
Li
from
lake
brine
(Mg
ratio:
31.58).
This
employs
commercially
available
monovalent
ion‐selective
membranes,
ions
are
driven
by
electric.
Using
four‐stage
technology,
selectivity
values
26,177
27,000
achieved
between
Cl
−
SO
4
2−
,
respectively.
The
electro‐stripping
mechanism
when
migrating
across
membranes
probably
magnitude
selectivity,
which
is
higher
than
other
reported
literature
membrane
processes,
purity
final
LiCl
product
greater
battery
grade
(99.95%).
proposed
process
can
potentially
be
applied
efficient
fractionation
special
separations.
Nature Communications,
Journal Year:
2022,
Volume and Issue:
13(1)
Published: Dec. 22, 2022
Abstract
Biological
cell
membranes
can
efficiently
switch
Na
+
/K
selectivity
in
response
to
external
stimuli,
but
achieving
analogous
functions
a
single
artificial
membrane
is
challenging.
Here,
we
report
highly
crystalline
covalent
organic
framework
(COF)
with
well-defined
nanochannels
and
coordinative
sites
(i.
e.,
amino
acid)
that
act
as
ion-selective
switches
manipulate
K
transport.
The
ion
of
the
COF
dynamic
be
switched
between
-selective
by
applying
pH
stimulus.
experimental
results
combined
molecular
dynamics
simulations
reveal
switchable
originates
from
differentiated
coordination
interactions
ions
acids.
Benefiting
selectivity,
further
demonstrate
potential
varying
electrolyte
pH,
miming
polarity
reversal
during
neural
signal
transduction
vivo,
suggesting
great
these
for
vitro
biomimetic
applications.
