Industrial & Engineering Chemistry Research,
Год журнала:
2024,
Номер
63(28), С. 12413 - 12428
Опубликована: Июль 4, 2024
Carboxylation
of
amines
is
an
important
route
to
obtain
amino
acids.
Herein,
we
have
reported
the
synthesis
and
characterizations
a
new
COF/gC3N4
composite
which
acted
as
heterogeneous
photocatalyst
for
carboxylation
unprotected
indoles
N-Boc-benzyl
amines.
We
used
SnO2
nanoparticles
cocatalyst
CO2
carbon
source
under
visible
light
irradiation.
This
gave
range
carboxylated
products
both
with
N-Boc-benzylamines
high
yield.
Control
experiments
optimum
reaction
conditions
this
photocatalytic
carboxylation.
Light
dependency
was
confirmed
by
altering
intensity
light.
Here,
synthesized
two
different
catalysts,
TpBpy
Tz
COF,
gC3N4
heterojunction
showed
excellent
activity.
The
photocatalysts,
COF/gC3N4,
are
recyclable
reusable
several
cycles
without
significant
loss
in
performance.
drug
compound
Clopidogrel
formation
unit
Tirofiban
demonstrated
these
protocols.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(49)
Опубликована: Авг. 17, 2024
Abstract
Covalent
organic
frameworks
(COFs)
are
a
promising
class
of
polymers
with
the
merits
robust
framework,
ultrahigh
porosity,
and
molecularly
precise
backbones,
which
reveals
great
potential
for
solar‐to‐chemical
energy
conversion
in
context
mitigating
environmental
crises.
However,
photochemical
activities
individual
COFs
not
as
desired,
primarily
due
to
their
limited
light
absorption,
insufficient
dissociation
photogenerated
excitons
readily
recombined
carriers.
Recently,
COFs‐based
metal‐free
heterojunctions
synergistic
effects
provide
feasible
route
boost
photocatalytic
activity
more
environmentally
friendly
cost‐competitive
manners.
Herein,
it
is
first
systematically
overview
advances
from
heterojunction
types,
heterointerfaces
interactions,
primary
design
mechanisms.
Then,
typical
photocatalysts
(e.g.,
g‐C
3
N
4
‐COFs,
carbon
materials‐COFs,
polymer
semiconductor‐COFs,
COFs‐COFs
heterojunction)
summarized.
Finally,
challenges
long‐term
outlooks
future
offered
terms
efficiency,
yield,
stability,
cost
reaction
mechanisms,
well
standardized
evaluation
method
activities.
It
anticipated
that
this
review
can
deliver
new
insights
into
fundamental
engineering
conversion,
further
accelerate
development
area.
Chemical Engineering Journal,
Год журнала:
2024,
Номер
494, С. 152843 - 152843
Опубликована: Июнь 5, 2024
A
sulfur-based
COF
has
been
combined
with
graphitic
carbon
nitride
(CN)
in
microwave-assisted
synthesis
to
build
a
COF-CN
heterostructure
enhanced
photocatalytic
activity.
The
prepared
were
fully
characterized,
analyzing
the
textural
(N2
isotherms),
structural
(XRD
and
FTIR),
chemical
(elemental
analysis
XPS),
morphological
(HR-STEM),
optical
(DRS-UV–Vis
photoluminescence)
electrochemical
properties
(EIS
impedance,
transient
photocurrent,
flat
band
potential).
Different
COF-to-CN
ratios
(5–25
%
of
COF,
wt.)
explored,
defining
proportion
(20
%)
that
led
optimum
activity
for
oxidation
organic
contaminants
emerging
concern
(CECs)
due
an
separation
photogenerated
charges
lower
bandgap
value,
2.55
vs.
2.35
eV.
performance
was
further
tested
other
CECs,
demonstrating
its
benefits
comparison
bare
CN.
materials
displayed
acceptable
reusability
stability.
mechanism
activation
highlights
importance
played
by
superoxide
radicals
holes.
Industrial & Engineering Chemistry Research,
Год журнала:
2024,
Номер
63(13), С. 5573 - 5590
Опубликована: Март 25, 2024
A
novel
triazine-based
structured
two-dimensional
(2D)
covalent
organic
framework
(COF),
known
as
TRITER-1,
has
been
prepared
through
the
Schiff-base
condensation
reaction
between
terephthalaldehyde
and
1,3,5-tris(4-aminophenyl)triazine.
Additionally,
g-C3N4
incorporated
within
imine-based
frameworks
to
produce
composite
TRITER-1@g-C3N4,
which
a
relatively
small
band
gap
of
2.0
eV.
This
composite,
called
synthesized
effectively
used
toward
light-driven
formation
methanol
from
most
greenhouse
gas
CO2.
highly
crystalline
polymeric
material
demonstrated
an
outstanding
photocatalytic
activity.
The
active
photocatalyst
TRITER-1@g-C3N4
successfully
reduces
CO2
into
under
ambient
conditions
in
presence
NiO
nanoparticles
cocatalyst
atmospheric
pressure.
visible-light-accelerated
metal-free
reduction
by
this
COF
accomplished
15
W
white
LED
light
illumination,
with
maximum
turnover
number
(TON
=
172,
μmol
22
600).
By
varying
intensity,
it
was
clear
that
failed
take
place
absence
LED.
We
proved
sunlight
can
also
TON
around
73
allow
for
sustainable
reactions.
catalyst
retains
its
catalytic
function
after
being
regenerated
multiple
times
is
effective
selective.
Inorganic Chemistry,
Год журнала:
2023,
Номер
62(24), С. 9702 - 9712
Опубликована: Июнь 7, 2023
The
construction
of
a
heterojunction
structure
is
considered
significant
route
to
promote
solar-driven
H2
production.
Herein,
CDs/ZnIn2S4/Ni-Al
LDHs
(CDZNA)
ternary
was
elaborately
constructed
via
the
in
situ
growth
ZnIn2S4
on
Ni-Al
with
incorporation
carbon
dots
(CDs)
cocatalyst,
which
used
as
highly
efficient
catalyst
for
photocatalytic
generation.
Characterizations
indicated
that
2D
nanosheet
homogeneously
dispersed
surface
fabricated
an
intimate
hierarchical
architecture
and
provided
high
BET
area
(135.12
m2
g-1).
In
addition,
unique
embeddable-dispersed
CDs
electron
mediators
possessed
numerous
active
sites
promoted
charge
separation
ZnIn2S4/Ni-Al
(ZNA)
binary
catalyst.
By
coupling
these
two
features,
CDZNA
exhibited
considerable
production
rate
23.1
mmol
g-1
h-1
under
visible-light
illumination,
16.4
1.4
times
higher
than
those
ZNA,
respectively.
A
proposed
mechanism
over
also
discussed.
This
work
provides
promising
strategy
achieve
solar
energy
conversion
system.
Sustainable Energy & Fuels,
Год журнала:
2023,
Номер
7(24), С. 5633 - 5647
Опубликована: Янв. 1, 2023
The
fabrication
of
template-free
dendritic
copper
sulphide
phase-coupled
metal–organic
framework
(MOF)
heterostructures
is
an
innovative
approach
for
boosting
light
harvesting
property
and
efficacy
towards
the
photoreduction
atmospheric
molecules.
Catalysis Science & Technology,
Год журнала:
2024,
Номер
14(4), С. 912 - 918
Опубликована: Янв. 1, 2024
Plasmonic
CN-NiMoN
heterojunctions
were
prepared
to
enhance
H
2
evolution
from
water
splitting
under
visible-light
(
λ
≥
420
nm).
Under
irradiation,
the
optimal
heterojunction
shows
5.4
times
higher
activity
than
that
of
g-C
3
N
4
.
