Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: March 2, 2023
Abstract
Olefin/paraffin
separation
is
an
important
but
challenging
and
energy-intensive
process
in
petrochemical
industry.
The
realization
of
carbons
with
size-exclusion
capability
highly
desirable
rarely
reported.
Herein,
we
report
polydopamine-derived
(PDA-Cx,
where
x
refers
to
the
pyrolysis
temperature)
tailorable
sub-5
Å
micropore
orifices
together
larger
microvoids
by
one-step
pyrolysis.
centered
at
4.1–4.3
PDA-C800
3.7–4.0
PDA-C900
allow
entry
olefins
while
entirely
excluding
their
paraffin
counterparts,
performing
a
precise
cut-off
discriminate
olefin/paraffin
sub-angstrom
discrepancy.
voids
enable
high
C
2
H
4
3
6
capacities
2.25
1.98
mmol
g
−1
under
ambient
conditions,
respectively.
Breakthrough
experiments
confirm
that
adsorption-desorption
can
obtain
high-purity
olefins.
Inelastic
neutron
scattering
further
reveals
host–guest
interaction
adsorbed
molecules
PDA-Cx.
This
study
opens
avenue
exploit
micropores
carbon
effect.
Chemical Society Reviews,
Journal Year:
2021,
Volume and Issue:
51(2), P. 672 - 719
Published: Dec. 21, 2021
This
review
article
is
devoted
to
bridging
the
conventional
and
newly-developed
NF
membranes
with
potential
environmental
applications
by
systematically
discussing
synthesis–property–performance
relationships.
Advanced Materials,
Journal Year:
2021,
Volume and Issue:
34(25)
Published: Sept. 17, 2021
Covalent
organic
frameworks
(COFs)
are
promising
membrane
materials
due
to
their
high
porosity,
ordered
arrangements,
and
stability.
However,
the
relatively
large
pore
size
complicated
preparation
processes
of
COFs
limit
applications
in
sieving
small
gas
molecules,
even
at
a
lab
scale.
Herein,
multi-interfacial
engineering
strategy
is
proposed,
that
is,
direct
layer-by-layer
interfacial
reaction
two
(TpPa-SO3
H
TpTGCl
)
with
different
sizes
form
narrowed
apertures
COF-COF
interfaces
atop
large-pore
COF
(COF-LZU1)
film.
At
423
K,
one
fabricated
155
nm-thick
ultrathin
displays
H2
permeance
as
2163
permeation
units
(GPU)
/CO2
selectivity
26,
transcending
2008
Robeson
upper
bound.
This
not
only
provides
high-performance
candidates
for
separation,
but
also
enlightens
manipulation
other
COFs,
porous
polymers,
membranes.
Science,
Journal Year:
2023,
Volume and Issue:
381(6664), P. 1350 - 1356
Published: Sept. 21, 2023
Mixed-matrix
membranes
(MMMs)
that
combine
processable
polymer
with
more
permeable
and
selective
filler
have
potential
for
molecular
separation,
but
it
remains
difficult
to
control
their
interfacial
compatibility
achieve
ultrathin
layers
during
processing,
particularly
at
high
loading.
We
present
a
solid-solvent
processing
strategy
fabricate
an
MMM
(thickness
less
than
100
nanometers)
loading
up
80
volume
%.
used
as
solid
solvent
dissolve
metal
salts
form
precursor
layer,
which
immobilizes
the
salt
regulates
its
conversion
metal-organic
framework
(MOF)
provides
adhesion
MOF
in
matrix.
The
resultant
membrane
exhibits
fast
gas-sieving
properties,
hydrogen
permeance
and/or
hydrogen-carbon
dioxide
selectivity
one
two
orders
of
magnitude
higher
state-of-the-art
membranes.
ACS Nano,
Journal Year:
2021,
Volume and Issue:
15(3), P. 5209 - 5220
Published: Feb. 23, 2021
Ion
transport
is
crucial
for
biological
systems
and
membrane-based
technologies
from
both
fundamental
practical
aspects.
Unlike
ion
channels,
realizing
efficient
sieving
by
using
membranes
with
artificial
channels
remains
an
extremely
challenging
task.
Inspired
proper
steric
containment
of
target
ions
within
affinitive
binding
sites
along
the
selective
filter,
herein
we
design
a
system
biomimic
two-dimensional
(2D)
ionic
based
on
graphene
oxide
(GO)
membrane,
where
imidazole
group
tunes
appropriate
physical
confinement
2D
to
mimic
confined
cavity
structures
selectivity
sulfonic
creates
favorable
chemical
environment
filter.
As
result,
as-fabricated
GO
membrane
demonstrates
exceptional
K+
rate
∼1.36
mol
m–2
h–1
competitive
K+/Mg2+
∼9.11,
outperforming
state-of-the-art
counterparts.
Moreover,
semiquantitative
studies
through
suggest
that
achieved
high
diffusion
partition
coefficients
hydrated
monovalent
ions,
as
well
large
energy
barrier
limited
potential
gradient
divalent
encountered.
Angewandte Chemie International Edition,
Journal Year:
2022,
Volume and Issue:
62(3)
Published: Nov. 18, 2022
Nano
and
single-atom
catalysis
open
new
possibilities
of
producing
green
hydrogen
(H2
)
by
water
electrolysis.
However,
for
the
evolution
reaction
(HER)
which
occurs
at
a
characteristic
rate
proportional
to
potential,
fast
generation
H2
nanobubbles
atomic-scale
interfaces
often
leads
blockage
active
sites.
Herein,
nanoscale
grade-separation
strategy
is
proposed
tackle
mass-transport
problem
utilizing
ordered
three-dimensional
(3d)
interconnected
sub-5
nm
pores.
The
results
reveal
that
3d
criss-crossing
mesopores
with
grade
separation
allow
efficient
diffusion
bubbles
along
channels.
After
support
ultrafine
ruthenium
(Ru),
are
on
superior
level
two-dimensional
system
maximizing
catalyst
performance
obtained
Ru
outperforms
most
other
HER
catalysts.
This
work
provides
potential
route
fine-tuning
few-nanometer
mass
transport
during
