Desalination,
Journal Year:
2023,
Volume and Issue:
555, P. 116520 - 116520
Published: March 6, 2023
Layer-by-layer
(LBL)
assembly
is
an
essential
method
for
the
preparation
of
nanofiltration
(NF)
membranes,
offering
tunable
charge
and
pore
size,
high
water
permeability,
good
anti-fouling
properties,
making
them
highly
suitable
resource
recovery,
seawater
desalination,
other
fields.
Despite
their
advantages,
LBL
NF
membranes
suffer
from
salinity
instability,
limiting
use
in
saline
streams.
This
perspective
review
provides
a
summary
fundamental
physical
chemical
principles
related
to
stability
membranes.
We
critically
analyze
driving
force
assembly,
binding
strength
polyelectrolyte
(PE)
pairs,
overcompensation
also
discuss
factors
affecting
level
with
respect
two
different
time
scales.
Furthermore,
we
examine
relationship
between
considering
(osmotic
pressure)
(Le
Chatelier's
principle)
aspects.
Our
analysis
demonstrates
that
solutions
can
be
improved
by
selecting
PEs
stronger
strength,
increasing
level,
crosslinking.
These
methods
not
only
enhance
but
offer
greater
potential
future
application
Advanced Membranes,
Journal Year:
2022,
Volume and Issue:
2, P. 100032 - 100032
Published: Jan. 1, 2022
Mono-/multivalent
ion-selective
separation
has
become
a
common
requirement
at
the
water-energy
nexus,
including
energy
storage
and
conversion,
water
purification,
sustainable
industrial
processes.
In
this
review,
we
summarize
theory
of
ion
transport
through
membrane
mechanisms
selective
in
nanofiltration
(NF)
briefly.
Recent
advancing
improving
mono-/multivalent
selectivity
thin-film
composite
(TFC)
NF
via
size
sieving
enhancement,
electric
charge
property
regulation
co-enhancement
properties
are
concluded.
What's
more,
three
material
classes—surface
assembly
materials,
nanomaterials
biomimetic
channels
highlighted
as
candidates
for
preparation
membranes.
Lastly,
design
directions
critical
challenges
developing
high-selectivity
membranes
based
on
provided.
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: Sept. 7, 2023
Abstract
Current
polyamide
lithium
extraction
nanofiltration
membranes
are
susceptible
to
chlorine
degradation
and/or
low
permeance,
two
problems
that
hard
reconcile.
Here
we
simultaneously
circumvented
these
by
designing
a
quaternized-spiro
piperazine
monomer
and
translating
its
beneficial
properties
into
large-area
(1
×
2
m
)
via
interfacial
polymerization
with
trimesoyl
chloride.
The
quaternary
ammonium
spiral
conformation
of
the
confer
more
positive
charge
free
volume
membrane,
leading
one
highest
permeance
(~22
L
−2
h
−1
bar
compared
state-of-the-art
Mg
2+
/Li
+
membranes.
Meanwhile,
membrane
structures
resistant
as
amine–acyl
bonding
contains
no
sensitive
N-H
group.
Thus
high
performance
is
stable
versus
400-h
immersion
in
sodium
hypochlorite,
while
control
degraded
readily.
Molecular
simulations
show
resistance,
which
were
reproducible
at
module
level,
arise
from
secondary
amine
monomer.
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: Nov. 22, 2023
Highly
permeable
polyamide
(PA)
membrane
capable
of
precise
ionic
sieving
can
be
utilized
for
many
energy-efficient
chemical
separations.
To
fulfill
this
target,
it
is
crucial
to
innovate
membrane-forming
process
induce
a
narrow
pore-size
distribution.
Herein,
we
report
an
anhydrous
interfacial
polymerization
(AIP)
at
solid-liquid
interface
where
the
amine
layer
sublimated
in
direct
contact
with
alkane
containing
acyl
chlorides.
In
such
heterophase
interface,
water-caused
side
reactions
are
eliminated,
and
amines
compact
arrangement
enable
intensive
orderly
IP
reaction,
leading
unique
PA
accuracy
0.5
Å.
The
AIP-PA
demonstrates
excellent
separation
selectivities
monovalent
divalent
cations
as
Mg2+/Li+
(78.3)
anions
Cl-/SO42-
(29.2)
together
high
water
flux
up
13.6
L
m-2
h-1
bar-1.
Our
AIP
strategy
may
provide
inspirations
engineering
high-precision
membranes
available
various
advanced
Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(38), P. 14464 - 14471
Published: Sept. 14, 2023
Nanofiltration
(NF)
is
a
promising
and
sustainable
process
to
extract
Li+
from
brine
lakes
with
high
Mg2+/Li+
mass
ratios.
However,
trade-off
between
Li/Mg
selectivity
Li
recovery
exists
at
the
scale,
of
commercially
lab-made
NF
membranes
in
single-pass
insufficient
achieve
industrially
required
purity.
To
overcome
this
challenge,
we
propose
multipass
recirculation
without
sacrificing
recovery.
We
experimentally
demonstrate
that
three-pass
commercial
membrane
can
exceed
1000,
despite
compromised
as
result
co-existing
cations.
Our
theoretical
analysis
further
predicts
four-pass
simultaneously
an
ultrahigh
over
4500
95%.
This
proposed
could
potentially
facilitate
efficient
NF-based
solute-solute
separations
all
kinds
contribute
development
novel
membrane-based
separation
technologies.
