Environmental Science & Technology,
Journal Year:
2022,
Volume and Issue:
56(24), P. 17955 - 17964
Published: Nov. 29, 2022
Nanofiltration
(NF)
is
an
effective
technology
for
removing
trace
organic
contaminants
(TrOCs),
while
the
inherent
trade-off
effect
between
water
permeance
and
solute
rejections
hinders
its
widespread
application
in
treatment.
Herein,
we
propose
a
novel
scheme
of
"monomers
with
sacrificial
groups"
to
regulate
microstructure
polyamide
active
layer
via
introducing
hydrolyzable
ester
group
onto
piperazine
control
diffusion
interfacial
polymerization
process.
The
achieved
benefits
include
narrowing
pore
size,
improving
interpore
connectivity,
enhancing
microporosity,
reducing
thickness,
which
collectively
realized
simultaneous
improvement
enhancement
TrOCs
rejection
performance.
resulting
membranes
were
superior
both
commercial
membranes,
especially
water-TrOCs
selectivity.
effects
using
new
monomers
on
membrane
physicochemical
properties
systematically
studied,
underlying
mechanisms
enhanced
separation
performance
further
revealed
by
simulating
process
through
density
functional
theory
calculation
measuring
trans-interface
rate
monomers.
This
study
demonstrates
promising
NF
synthesis
strategy
designing
structure
reaction
achieving
excellent
low
energy
input
Environmental Science & Technology,
Journal Year:
2024,
Volume and Issue:
58(21), P. 9416 - 9426
Published: April 25, 2024
The
polyamide
(PA)
nanofiltration
(NF)
membrane
has
the
potential
to
remove
endocrine-disrupting
compounds
(EDCs)
from
water
and
wastewater
prevent
risks
both
aquatic
ecosystem
human
health.
However,
our
understanding
of
EDC
removal–water
permeance
trade-off
by
PA
NF
is
still
limited,
although
salt
selectivity–water
been
well
illustrated.
This
constrains
precise
design
a
high-performance
for
removing
EDCs.
In
this
study,
we
manipulated
nanostructures
membranes
altering
piperazine
(PIP)
monomer
concentrations
during
interfacial
polymerization
(IP)
process.
upper
bound
coefficient
was
demonstrated
be
more
than
two
magnitudes
lower
that
permeance.
Such
variations
were
derived
different
membrane–solute
interactions,
in
which
water/EDC
selectivity
determined
combined
effects
steric
exclusion
hydrophobic
interaction,
while
electrostatic
interaction
played
crucial
roles
water/salt
selectivity.
We
further
highlighted
role
pore
number
residual
groups
transport
molecules
across
via
molecular
dynamics
(MD)
simulations.
Fewer
pores
decreased
channels,
existence
might
cause
hindrance
dynamic
disturbance
inside
membrane.
study
elucidated
phenomenon
mechanisms
between
permeance,
providing
theoretical
reference
effective
removal
EDCs
reuse.
Membranes,
Journal Year:
2023,
Volume and Issue:
13(4), P. 368 - 368
Published: March 23, 2023
The
increasing
demand
for
nanofiltration
processes
in
drinking
water
treatment,
industrial
separation
and
wastewater
treatment
has
highlighted
several
shortcomings
of
current
state-of-the-art
thin
film
composite
(TFC
NF)
membranes,
including
limitations
chemical
resistance,
fouling
resistance
selectivity.
Polyelectrolyte
multilayer
(PEM)
membranes
provide
a
viable,
industrially
applicable
alternative,
providing
significant
improvements
these
limitations.
Laboratory
experiments
using
artificial
feedwaters
have
demonstrated
selectivity
an
order
magnitude
higher
than
polyamide
NF,
significantly
excellent
(e.g.,
200,000
ppmh
chlorine
stability
over
the
0–14
pH
range).
This
review
provides
brief
overview
various
parameters
that
can
be
modified
during
layer-by-layer
procedure
to
determine
fine-tune
properties
resulting
NF
membrane.
different
adjusted
process
are
presented,
which
used
optimize
Substantial
progress
PEM
membrane
development
is
particularly
improvements,
most
promising
route
seems
asymmetric
offering
breakthrough
active
layer
thickness
organic/salt
selectivity:
average
98%
micropollutant
rejection
coupled
with
NaCl
below
15%.
Advantages
highlighted,
high
selectivity,
wide
range
cleaning
methods.
Additionally,
disadvantages
also
outlined;
while
may
impede
their
use
some
applications,
they
largely
not
restrictive.
effect
realistic
feeds
(wastewaters
challenging
surface
waters)
on
performance
presented:
pilot
studies
conducted
up
12
months
show
stable
values
no
irreversible
fouling.
We
close
our
by
identifying
research
areas
where
further
needed
facilitate
adoption
this
notable
technology.
