Proceedings of the National Academy of Sciences,
Год журнала:
2025,
Номер
122(16)
Опубликована: Апрель 16, 2025
Mimicking
the
interconvertible
carbon
allotropes
of
2-dimensional
(2D)
graphene
and
1-dimensional
(1D)
nanotubes
(CNTs),
herein
we
report
in
situ
transformation
2D
π-conjugated
covalent
organic
frameworks
(COFs)
sheet
into
1D
nanotubular
structures
via
self-assembly
sheets
at
solvent
interfaces.
The
facile
“roll-sheets”
resulted
coaxial
with
uniform
cross-sectional
diameter,
which
was
realized
for
diazapyrene-based
COFs
but
not
corresponding
pyrene
COF,
although
both
possess
similar
chemical
structures.
Upon
replacing
atoms
2,7-positions
nitrogen,
contrasting
optical
electronic
properties
were
realized,
reflecting
rolled
structure
conjugated
sheets.
exhibited
concerted
electronic-
proton-conducting
nature
stable
conducting
pathways
ambient
conditions.
nitrogen
centers
act
simultaneously
as
site
charge
carrier
doping
proton
acceptors,
evidenced
by
high
photo-
electrical
conductivity,
well
record
conductivity
(σ
=
1.98
S
cm
−1
)
results.
present
COF
serves
a
unique
materials
platform
conduction
wall
core,
respectively.
International Journal of Environmental & Analytical Chemistry,
Год журнала:
2024,
Номер
unknown, С. 1 - 16
Опубликована: Апрель 8, 2024
Water
pollution
is
a
global
concern
due
to
the
unregulated
discharge
of
various
pollutants
into
aquatic
environments
without
proper
treatment.
A
prominent
contributor
environmental
degradation
and
adverse
health
effects
unmitigated
heavy
metal
ions
within
industrial
effluents.
The
present
study
revealed
synthesis
p-imidazolemethylcalix[4]arene-based
resin
(4)
its
application
as
an
adsorbent
for
removal
toxic
metals,
i.e.,
Pb2+and
Cd2+,
from
aqueous
media.
proceeded
through
well-known
organic
synthetic
procedures
was
characterised
by
different
analytical
techniques,
FT-IR,
SEM
elemental
analyses.
However,
adsorption
process
monitored
using
UV-Vis
spectrophotometer.
behaviour
evaluated
batch
experiments,
parameters,
such
pH,
dosage
contact
time,
were
optimised.
experimental
results
Langmuir
Freundlich
isotherm
models.
Moreover,
kinetic
thermodynamic
studies
also
performed
evaluate
data.
maximum
98%
96%,
respectively,
Cd2+
observed
at
pH
7
with
30
mg
after
1
h
ambient
temperature.
compared
those
other
reported
materials,
it
could
be
concluded
that
has
great
potential
minimising
risk
water
pollution.
This
novel
demonstrates
exceptional
versatility
in
capacity
effectively
capture
wide
range
wastewater,
thereby
offering
comprehensive
solution
pressing
concern.
specific
molecular
structure
p-Imidazolemethylcalix[4]arene
enables
selective
efficient
ions,
surpassing
conventional
methods
terms
both
effectiveness
versatility.
characterisation
this
unique
resin,
coupled
demonstrated
efficacy
ion
removal,
represent
significant
advancement
field
remediation.
Nanoscale,
Год журнала:
2023,
Номер
16(3), С. 961 - 977
Опубликована: Дек. 4, 2023
Covalent
organic
frameworks
(COF)
are
porous
crystalline
polymers
connected
by
covalent
bonds.
Due
to
their
inherent
high
specific
surface
area,
tunable
pore
size,
and
good
stability,
they
have
attracted
extensive
attention
from
researchers.
In
recent
years,
COF
membrane
materials
developed
rapidly,
a
large
amount
of
research
work
has
been
presented
on
the
preparation
methods,
properties,
applications
membranes.
This
review
focuses
independent/pure
continuous
First,
based
formation
mechanism,
methods
categorized
into
two
main
groups:
bottom-up
top-down.
Four
presented,
namely,
solvothermal,
interfacial
polymerization,
steam-assisted
conversion,
layer
layer.
Then,
aperture,
hydrophilicity/hydrophobicity
charge
properties
membranes
summarized
outlined.
According
application
directions
gas
separation,
water
treatment,
solvent
nanofiltration,
pervaporation
energy,
latest
results
presented.
Finally,
challenges
future
an
outlook
provided.
It
is
hoped
that
this
will
inspire
motivate
researchers
in
related
fields.
