Abstract
Herein,
we
demonstrate
the
synthesis
of
beta-cyclodextrin
(β–CD)
functionalized
polyvinylidene
fluoride
(PVDF)
and
iron-based
metal-organic
framework
(Fe–MOF)
mixed
matrix
membrane
(MMM)
for
enhanced
removal
ciprofloxacin
(CIP)
from
water.
The
membranes
were
prepared
using
phase
inversion
technique
with
PVDF
as
polymer
matrix,
Fe–MOF
filler,
polyvinylpyrrolidone
(PVP)
porogen.
optimized
MMM
7%
wt.
exhibited
excellent
performance
87.6%
efficiency.
Moreover,
maximum
adsorption
capacity
was
6.43
mg
g
–1
.
β–CD
functionalization
improved
hydrophilicity
by
water
contact
angle
(WCA)
analysis
(WCA
=
55°).
Furthermore,
can
be
attributed
to
large
specific
surface
area
(682.5
m
2
),
high
porosity
(77%),
average
pore
diameter
(395
nm)
membrane.
inclusion
PVP
(1%
wt.)
porous
nature
and,
consequently,
CIP.
Notably,
hydrophilic
macroporous
showed
good
reusability
over
70%
efficiency
after
five
sequential
adsorption–desorption
cycles.
insights
this
study
suggest
that
PMC–7
an
candidate
remediation
organic
contaminants
aquatic
environments.
Environmental Science & Technology,
Год журнала:
2020,
Номер
54(24), С. 15563 - 15583
Опубликована: Ноя. 19, 2020
The
separation
properties
of
polyamide
reverse
osmosis
and
nanofiltration
membranes,
widely
applied
for
desalination
water
reuse,
are
constrained
by
the
permeability-selectivity
upper
bound.
Although
thin-film
nanocomposite
(TFN)
membranes
incorporating
nanomaterials
exhibit
enhanced
permeance,
their
rejection
is
only
moderately
improved
or
even
impaired
due
to
agglomeration
formation
defects.
A
novel
type
TFN
featuring
an
interlayer
(TFNi)
has
emerged
in
recent
years.
These
TFNi
show
extraordinary
improvement
flux
(e.g.,
up
order
magnitude
enhancement)
along
with
better
selectivity.
Such
enhancements
can
be
achieved
a
wide
selection
nanomaterials,
ranging
from
nanoparticles,
one-/two-dimensional
materials,
interfacial
coatings.
use
nanostructured
interlayers
not
improves
layers
but
also
provides
optimized
transport
path,
which
enables
potentially
overcome
longstanding
trade-off
between
membrane
permeability
Furthermore,
enhance
removal
heavy
metals
micropollutants,
critical
many
environmental
applications.
This
review
critically
examines
developments
discusses
underlying
mechanisms
design
criteria.
Their
potential
applications
highlighted.
Environmental Science & Technology,
Год журнала:
2021,
Номер
55(3), С. 1359 - 1376
Опубликована: Янв. 13, 2021
Selective
removal
or
enrichment
of
targeted
solutes
including
micropollutants,
valuable
elements,
and
mineral
scalants
from
complex
aqueous
matrices
is
both
challenging
pivotal
to
the
success
water
purification
resource
recovery
unconventional
resources.
Membrane
separation
with
precision
at
subnanometer
even
subangstrom
scale
paramount
importance
address
those
challenges
via
enabling
"fit-for-purpose"
wastewater
treatment.
So
far,
researchers
have
attempted
develop
novel
membrane
materials
precise
tailored
selectivity
by
tuning
structure
chemistry.
In
this
critical
review,
we
first
present
environmental
opportunities
that
necessitate
improved
solute–solute
in
separation.
We
then
discuss
mechanisms
desired
properties
required
for
better
selectivity.
On
basis
most
recent
progress
reported
literature,
examine
key
principles
material
design
fabrication,
which
create
membranes
enhanced
more
highlight
important
roles
surface
engineering,
nanotechnology,
molecular-level
improving
Finally,
prospects
highly
selective
NF
practical
applications,
identifying
knowledge
gaps
will
guide
future
research
promote
sustainability
through
tunable
Environmental Science & Technology,
Год журнала:
2020,
Номер
54(18), С. 11611 - 11621
Опубликована: Авг. 12, 2020
Interlayered
thin-film
nanocomposite
membranes
(TFNi)
are
an
emerging
type
of
with
great
potential
to
overcome
the
permeability-selectivity
upper
bound
conventional
composite
(TFC)
nanofiltration
and
reverse
osmosis
membranes.
However,
exact
roles
interlayer
corresponding
mechanisms
leading
enhanced
separation
performance
TFNi
remain
poorly
understood.
This
study
reports
a
polydopamine
(PDA)-intercalated
membrane
(PA-PSF2,
PDA
coating
time
2
h)
that
possessed
nearly
order
magnitude
higher
water
permeance
(14.8
±
0.4
Lm-2
h-1
bar-1)
than
control
TFC
(PA-PFS0,
2.4
0.5
bar-1).
The
further
showed
rejection
toward
wide
range
inorganic
salts
small
organic
molecules
(including
antibiotics
endocrine
disruptors).
Detailed
mechanistic
investigation
reveals
was
due
both
direct
"gutter"
effect
its
indirect
effects
resulting
from
polyamide
formation
on
PDA-coated
substrate,
playing
more
dominant
role.
provides
comprehensive
framework
for
future
development
