ACS Omega,
Journal Year:
2023,
Volume and Issue:
8(17), P. 14965 - 14984
Published: April 17, 2023
This
study
reports
on
successful
synthesis
of
carbon
dots
(CDs),
nitrogen-doped
zinc
oxide
(N-ZnO),
and
N-ZnO/CD
nanocomposites
as
photocatalysts
for
degradation
methylene
blue.
The
first
part
was
the
CDs
utilizing
a
precursor
from
soybean
ethylenediamine
dopant
by
hydrothermal
method.
second
N-ZnO
with
urea
nitrogen
carried
out
calcination
method
in
furnace
at
500
°C
2
h
an
N2
atmosphere
(5
min-1).
third
nanocomposites.
characteristics
CDs,
N-ZnO,
were
analyzed
through
Fourier
transform
infrared
(FTIR),
UV-vis
absorbance,
photoluminescence
(PL),
high-resolution
transmission
electron
microscopy
(HR-TEM),
X-ray
diffraction
(XRD),
thermal
gravimetry
analysis
(TGA),
field-emission
scanning
energy-dispersive
spectroscopy
(FESEM
EDS),
photoelectron
(XPS),
Brunauer-Emmett-Teller
(BET)
analysis.
Based
HR-TEM
analysis,
had
spherical
shape
average
particle
size
4.249
nm.
Meanwhile,
based
XRD
characterization,
have
wurtzite
hexagonal
structures.
materials
show
increased
adsorption
visible
light
region
low
energy
gap
Eg.
Eg
values
N-ZnO/CDs
found
to
be
2.95
2.81
eV,
respectively,
whereas
surface
area
(SBET)
3.827
m2
g-1
(N-ZnO)
3.757
g-1(N-ZnO/CDs)
belonged
microporous
structure.
In
last
part,
used
MB
(10
ppm)
under
UV-B
irradiation
pH
=
7.04
(neutral)
60
min
room
temperature.
showed
photodegradation
efficiency
83.4%
kinetic
rate
0.0299
min-1
higher
than
CDs.
FESEM
EDS
before
after
three
cycles
confirm
stability
photocatalyst
58.2%.
These
results
clearly
shown
that
could
ideal
photocatalytic
material
decolorization
organic
compounds
wastewater.
Carbon Energy,
Journal Year:
2022,
Volume and Issue:
4(1), P. 88 - 114
Published: Jan. 1, 2022
Abstract
Fluorescent
carbon
dots
(CDs)
have
recently
become
a
research
hotspot
in
multidisciplinary
fields
owing
to
their
distinctive
advantages,
including
outstanding
photoluminescence
properties,
high
biocompatibility,
low
toxicity,
and
abundant
raw
materials.
Among
the
promising
CDs,
narrow‐bandwidth
emissive
CDs
with
color
purity
emerged
as
rising
star
recent
years
because
of
significant
potential
applications
bioimaging,
information
sensing,
photoelectric
displays.
In
this
review,
state‐of‐the‐art
advances
are
systematically
summarized,
factors
influencing
emission
bandwidth,
preparation
methods,
described
detail.
Besides,
existing
challenges
future
perspectives
for
achieving
high‐performance
also
discussed.
This
overview
paper
is
expected
generate
more
interest
promote
rapid
development
area.
Small,
Journal Year:
2022,
Volume and Issue:
19(31)
Published: Dec. 7, 2022
Abstract
Carbon
dots
(CDs),
fluorescent
carbon
nanoparticles
with
particle
sizes
<
10
nm,
are
constantly
being
developed
for
potential
large‐scale
applications.
Recently,
methods
allow
CD
synthesis
to
be
carried
out
on
preparation
in
a
controlled
fashion
potentially
important
multiple
disciplines,
including
bottom‐up
strategy,
top‐down
method.
In
this
review,
the
recent
progresses
research
of
production
CDs
and
their
functionalization
summarized.
Especially,
synthesis,
such
as
preparation,
hydrothermal/solvothermal,
microwave‐assisted,
magnetic
hyperthermia
microfluidic
other
methods,
along
CDs,
summarized
detail.
By
promising
applications
there
three
aspects
have
been
already
reported,
enhancing
mechanical
properties,
flame
retardancy,
energy
storage.
Also,
future
development
is
prospected.
ACS Omega,
Journal Year:
2023,
Volume and Issue:
8(17), P. 14965 - 14984
Published: April 17, 2023
This
study
reports
on
successful
synthesis
of
carbon
dots
(CDs),
nitrogen-doped
zinc
oxide
(N-ZnO),
and
N-ZnO/CD
nanocomposites
as
photocatalysts
for
degradation
methylene
blue.
The
first
part
was
the
CDs
utilizing
a
precursor
from
soybean
ethylenediamine
dopant
by
hydrothermal
method.
second
N-ZnO
with
urea
nitrogen
carried
out
calcination
method
in
furnace
at
500
°C
2
h
an
N2
atmosphere
(5
min-1).
third
nanocomposites.
characteristics
CDs,
N-ZnO,
were
analyzed
through
Fourier
transform
infrared
(FTIR),
UV-vis
absorbance,
photoluminescence
(PL),
high-resolution
transmission
electron
microscopy
(HR-TEM),
X-ray
diffraction
(XRD),
thermal
gravimetry
analysis
(TGA),
field-emission
scanning
energy-dispersive
spectroscopy
(FESEM
EDS),
photoelectron
(XPS),
Brunauer-Emmett-Teller
(BET)
analysis.
Based
HR-TEM
analysis,
had
spherical
shape
average
particle
size
4.249
nm.
Meanwhile,
based
XRD
characterization,
have
wurtzite
hexagonal
structures.
materials
show
increased
adsorption
visible
light
region
low
energy
gap
Eg.
Eg
values
N-ZnO/CDs
found
to
be
2.95
2.81
eV,
respectively,
whereas
surface
area
(SBET)
3.827
m2
g-1
(N-ZnO)
3.757
g-1(N-ZnO/CDs)
belonged
microporous
structure.
In
last
part,
used
MB
(10
ppm)
under
UV-B
irradiation
pH
=
7.04
(neutral)
60
min
room
temperature.
showed
photodegradation
efficiency
83.4%
kinetic
rate
0.0299
min-1
higher
than
CDs.
FESEM
EDS
before
after
three
cycles
confirm
stability
photocatalyst
58.2%.
These
results
clearly
shown
that
could
ideal
photocatalytic
material
decolorization
organic
compounds
wastewater.
