ACS Applied Nano Materials,
Journal Year:
2023,
Volume and Issue:
6(13), P. 12124 - 12131
Published: June 20, 2023
Effective
C2H2/CO2
separation
is
regarded
as
a
crucial
procedure
in
the
C2H2
industry
yet
extremely
challenging
because
of
their
similar
physical
and
chemical
properties.
Covalent
organic
frameworks
(COFs)
have
become
promising
platform
for
gas
adsorption
separation,
but
they
still
suffer
from
unsatisfactory
capacity
selectivity.
Herein,
we
report
nanoporous
fluorine-functioned
COF
(TpPa-F)
which
was
synthesized
by
mechanochemical
approach
with
F-containing
precursor
(2-fluoro-1,4-benzenediamine).
A
superior
117
cm3/g
(4.78
mmol/g)
selectivity
3.3
at
298
K
1
bar
were
achieved,
surpass
most
reported
adsorbents
literature.
Notably,
TpPa-F
exhibited
an
extraordinary
thermal
stability
up
to
around
673
showed
robustness
or
acidic/basic
solutions.
Theoretical
calculations
reveal
hydrogen
bond
interaction
C≡C–H···F,
contributes
high
uptake
This
work
provides
strategy
fluorine
functionalization
enhancing
ability
recognize
separate
small
molecules
large
channel.
Chemical Society Reviews,
Journal Year:
2022,
Volume and Issue:
51(17), P. 7427 - 7508
Published: Jan. 1, 2022
Fluorinated
metal-organic
frameworks
(F-MOFs)
as
fast-growing
porous
materials
have
revolutionized
the
field
of
gas
separation
due
to
their
tunable
pore
apertures,
appealing
chemical
features,
and
excellent
stability.
A
deep
understanding
structure-performance
relationships
is
critical
for
synthesis
development
new
F-MOFs.
This
review
has
focused
on
several
strategies
precise
design
F-MOFs
with
structures
tuned
specific
purposes.
First,
basic
principles
concepts
well
structure,
modification
structure
property
are
studied.
Then,
applications
in
adsorption
membrane
discussed.
detailed
account
capabilities
various
gases
governing
provided.
In
addition,
exceptional
characteristics
highly
stable
engineered
size
put
into
perspective
fabricate
selective
membranes
separation.
Systematic
analysis
position
revealed
that
benchmark
most
challenging
separations.
The
outlook
future
directions
science
engineering
challenges
highlighted
tackle
issues
overcoming
trade-off
between
capacity/permeability
selectivity
a
serious
move
towards
industrialization.
Journal of the American Chemical Society,
Journal Year:
2023,
Volume and Issue:
145(25), P. 13901 - 13911
Published: June 13, 2023
One-step
harvest
of
high-purity
light
hydrocarbons
without
the
desorption
process
represents
an
advanced
and
highly
efficient
strategy
for
purification
target
substances.
The
separation
acetylene
(C2H2)
from
carbon
dioxide
(CO2)
by
CO2-selective
adsorbents
are
urgently
demanded
yet
very
challenging
owing
to
their
similar
physicochemical
properties.
Here,
we
employ
pore
chemistry
adjust
environment
immobilizing
polar
groups
into
ultramicroporous
metal-organic
framework
(MOF),
achieving
one-step
manufacture
C2H2
CO2/C2H2
mixtures.
Embedding
methyl
prototype
stable
MOF
(Zn-ox-trz)
not
only
changes
but
also
improves
discrimination
guest
molecules.
methyl-functionalized
Zn-ox-mtz
thus
exhibits
benchmark
reverse
uptake
ratio
12.6
(123.32/9.79
cm3
cm-3)
exceptionally
high
equimolar
selectivity
1064.9
at
ambient
conditions.
Molecular
simulations
reveal
that
synergetic
effect
confinement
surfaces
decorated
with
provides
recognition
CO2
molecules
through
multiple
van
der
Waals
interactions.
column
breakthrough
experiments
suggest
dramatically
achieved
capacity
mixture
a
record
productivity
2091
mmol
kg-1,
surpassing
all
reported
so
far.
In
addition,
excellent
chemical
stability
under
different
pH
values
aqueous
solutions
(pH
=
1-12).
Moreover,
inverse
selective
performance
showcase
its
promising
application
as
splitter
industrial
manufacture.
This
work
paves
way
developing
reverse-selective
gas
process.
