Research Square (Research Square),
Journal Year:
2023,
Volume and Issue:
unknown
Published: Nov. 16, 2023
Abstract
Efficient
and
selective
ion
transport
in
nature
is
primarily
facilitated
by
ion-conductive
biological
channels
cell
membranes.
These
reveal
an
architectural
design
with
specialized
functionality.
Drawing
inspiration
from
this,
our
study
focused
on
developing
a
monovalent
membrane
through
interchain
interactions
between
polybenzimidazole
sulfonated
poly
(ether
ether
ketone)
to
form
angstrom-scale
confined
nanochannels.
The
nanochannels
exhibit
pronounced
hydrogen-bonding
hydrated
multivalent
ions,
while
rendering
significant
charge
effects
that
impede
their
transition
compressing
the
effective
passageways.
Both
hydrogen
bonding
electrostatic
interaction
synergistically
result
high
selectivity
of
ions
over
as
latter
necessitates
overcoming
higher
energy
barriers
compared
former
for
resulting
achieved
permeation
rates
1.35
mol·m
−2
·h
−1
mono/multivalent
K
+
/Mg
2+
56.5
/Al
3+
286.
Our
discoveries
provide
valuable
strategies
sub-nanometer
desired
functionality
contributes
remarkably
efficient
separation
via
electrodialysis
beyond.
Nano Letters,
Journal Year:
2024,
Volume and Issue:
24(28), P. 8650 - 8657
Published: July 1, 2024
The
ion
permeability
and
selectivity
of
membranes
are
crucial
in
nanofluidic
behavior,
impacting
industries
ranging
from
traditional
to
advanced
manufacturing.
Herein,
we
demonstrate
the
engineering
ion-conductive
featuring
angstrom-scale
ion-transport
channels
by
introducing
ionic
polyamidoamine
(PAMAM)
dendrimers
for
separation.
exterior
quaternary
ammonium-rich
structure
contributes
significant
electrostatic
charge
exclusion
due
enhanced
local
density;
interior
protoplasmic
PAMAM
dendrimer
assembled
provide
additional
degrees
free
volume.
This
facilitates
monovalent
transfer
while
maintaining
continuity
efficient
screening.
dendrimer-assembled
hybrid
membrane
achieves
high
permeance
2.81
mol
m
AIChE Journal,
Journal Year:
2024,
Volume and Issue:
70(5)
Published: Feb. 15, 2024
Abstract
The
recovery
of
acid/base
from
industrial
wastewater
via
membrane
technology
is
energy
efficient
and
has
a
low
carbon
footprint,
while
demanding
high‐performing
ion
exchange
membranes.
It
remains
grand
challenge
for
membranes,
enabling
concomitantly
fast
H
+
/OH
−
transport
high
selectivity.
This
article
presents
negatively
charged
microporous
polymer
membrane,
sulfonated
polyxanthene
which
intrinsic
micropore
channels
permeation,
we
find
that
highly
selective
OH
can
be
acquired
with
the
same
membrane.
exhibits
/Fe
2+
selectivity
617
(6.3
times
commercial
CIMS
membrane)
in
acid
very
/WO
4
2−
649
(the
highest
value
ever
reported)
alkali
maintaining
comparable
rate.
results
highlight
importance
hydrophilic
micropores
as
ion‐selective
constructing
membranes
resource
recovery.
AIChE Journal,
Journal Year:
2024,
Volume and Issue:
70(10)
Published: June 18, 2024
Abstract
In
nature,
efficient
and
selective
ion
transport
is
facilitated
by
ion‐conductive
channels
in
cell
membranes;
these
reveal
an
architectural
design
with
specialized
functionality.
Drawing
inspiration
from
this,
mechanistic
insights
into
the
angstrom‐scale‐channel
membrane
composed
of
ionic‐crosslinked
polybenzimidazole
sulfonated
poly(ether
ether
ketone),
exhibiting
functional
differentiation
ion‐sieving
properties
are
presented.
Nanochannels
allow
for
strong
hydrogen‐bonding
interactions
hydrated
ions
higher
polarity,
while
rendering
significant
electrostatic
charge
effects
that
impede
transition
multivalent
compressing
effective
passageways.
Both
hydrogen
bonding
synergistically
result
high
selectivity
monovalent
over
because
latter
requires
overcoming
energy
barriers
compared
former,
thereby
causing
varying
extents
dehydration
within
nanochannels.
The
resulting
achieves
a
permeation
rate
1.35
mol
m
−2
h
−1
mono/multivalent
56.5
K
+
/Mg
2+
286
/Al
3+
.
AIChE Journal,
Journal Year:
2025,
Volume and Issue:
71(6)
Published: Feb. 28, 2025
Abstract
The
swift
advancement
of
monovalent
anion
perm‐selective
membranes
(MAPMs)
presents
a
promising
and
sustainable
approach
for
separation.
However,
their
progress
remains
predominantly
based
on
microphase‐separated
characterized
by
wide,
swelling
ion‐selective
channels.
In
this
study,
the
rigidity
flexibility
coupled
concept
was
employed
to
engineer
rigidly
confined
channels
within
MAPMs
facilitate
rigid
segments
self‐assemble
into
micropores
(<0.8
nm),
with
dimensions
precisely
modulated
flexible
segments.
Under
electrodialysis
conditions,
these
demonstrate
an
order‐of‐magnitude
improvement
in
selectivity
compared
Neosepta®
ACS
commercial
(special
separation),
slight
increase
permeation
flux
anions.
simulation
results
confirm
that
difference
confinement
various
anions,
driven
electrostatic
interactions
micropores,
is
responsible
exceptional
monovalent/bivalent
selectivity.
Overall,
study
provides
alternative
strategy
construct
efficient
