Environmental Science & Technology,
Год журнала:
2022,
Номер
56(22), С. 15220 - 15237
Опубликована: Ноя. 4, 2022
In
view
of
the
high
risks
brought
about
by
organic
micropollutants
(OMPs),
nanofiltration
(NF)
processes
have
been
playing
a
vital
role
in
advanced
water
and
wastewater
treatment,
owing
to
membrane
performance
rejection
OMPs,
permeation
water,
passage
mineral
salts.
Though
numerous
studies
devoted
evaluating
technically
enhancing
removing
various
trade-off
effect
between
permeance
water/OMP
selectivity
for
state-of-the-art
membranes
remains
far
from
being
understood.
Knowledge
this
is
significant
comparing
guiding
development
works
toward
cost-efficient
OMP
removal.
work,
we
comprehensively
assessed
88
NF
membranes,
commercialized
or
newly
developed,
based
on
their
data
published
literature.
The
effectiveness
underlying
mechanisms
modification
methods
tailoring
properties
turn
mainstream
polyamide
(PA)
thin-film
composite
(TFC)
were
quantitatively
analyzed.
was
demonstrated
abundant
both
experimental
measurements
machine
learning-based
prediction.
On
basis,
advancement
novel
benchmarked
upper-bound
revealed
commercial
lab-made
PA
membranes.
We
also
potentials
current
selectively
separating
OMPs
inorganic
salts
identified
future
research
perspectives
achieve
further
enhancement
removal
salt/OMP
Environmental Science & Technology,
Год журнала:
2023,
Номер
57(15), С. 6320 - 6330
Опубликована: Апрель 7, 2023
Membranes
offer
a
scalable
and
cost-effective
approach
to
ion
separations
for
lithium
recovery.
In
the
case
of
salt-lake
brines,
however,
high
feed
salinity
low
pH
post-treated
have
an
uncertain
impact
on
nanofiltration's
selectivity.
Here,
we
adopt
experimental
computational
approaches
analyze
effect
elucidate
key
selectivity
mechanisms.
Our
data
set
comprises
over
750
original
rejection
measurements,
spanning
five
salinities
two
levels,
collected
using
brine
solutions
that
model
three
compositions.
results
demonstrate
Li+/Mg2+
polyamide
membranes
can
be
enhanced
by
13
times
with
acid-pretreated
solutions.
This
enhancement
is
attributed
amplified
Donnan
potential
from
ionization
carboxyl
amino
moieties
under
solution
pH.
As
increase
10
250
g
L–1,
decreases
∼43%,
consequence
weakening
exclusion
Further,
our
analysis
accentuates
importance
measuring
separation
factors
representative
compositions
replicate
ion-transport
behaviors
brine.
Consequently,
reveal
predictions
improved
up
80%
when
appropriate
Cl–/SO42–
molar
ratios
are
used.
Environmental Science & Technology,
Год журнала:
2024,
Номер
unknown
Опубликована: Фев. 7, 2024
Selective
electrodialysis
(ED)
is
a
promising
membrane-based
process
to
separate
Li+
from
Mg2+,
which
the
most
critical
step
for
Li
extraction
brine
lakes.
This
study
theoretically
compares
ED-based
Li/Mg
separation
performance
of
different
monovalent
selective
cation
exchange
membranes
(CEMs)
and
nanofiltration
(NF)
at
coupon
scale
using
unified
mass
transport
model,
i.e.,
solution-friction
model.
We
demonstrated
that
CEMs
with
dense
surface
thin
film
like
polyamide
are
more
effective
in
enhancing
than
those
loose
but
highly
charged
film.
Polyamide
film-coated
when
used
ED
have
similar
polyamide-based
NF
NF.
membranes,
expected
replace
separation,
will
require
support
layer
low
tortuosity
high
porosity
reduce
internal
concentration
polarization.
The
coupon-scale
analysis
comparison
provide
new
insights
into
design
composite
ion–ion
separation.
