Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(22), P. 8414 - 8425
Published: May 25, 2023
Pharmaceuticals
and
personal
care
products
(PPCPs)
are
ubiquitous
in
sewage,
adversely
affecting
ecosystems
human
health.
In
this
study,
an
S-scheme
magnetic
ZnFe2O4/ammoniated
MoS2
(ZnFe2O4/A-MoS2)
heterojunction
as
a
visible-light-driven
PMS
activator
for
PPCP
degradation
was
developed.
ZnFe2O4/A-MoS2
achieves
improved
photocatalytic
activity
because
the
construction
of
promotes
separation
highly
reductive
photogenerated
electrons.
The
optimized
photocatalyst
(10%-ZnFe2O4/A-MoS2,
0.2
g/L)
achieved
100%
removal
2
ppm
carbamazepine
(CBZ)
within
2.5
min
at
dosage
0.5
mM
(initial
pH
7.0).
Mechanistic
investigation
revealed
that
separated
electrons
to
ZnFe2O4
reactive
center
facilitated
activation
generated
SO4·–
dominant
species
CBZ
degradation.
system
exhibited
excellent
practicability
various
samples
actual
where
most
sewage
components
negatively
impacted
Further,
chloride
ions
high-salinity
could
be
activated
generate
additional
chlorine
possesses
outstanding
reusability
stability
treating
water
conditions.
This
work
provides
mechanistic
practical
perspectives
developing
novel
S-type
heterojunctions
recalcitrant
pollutant
treatment.
The Journal of Physical Chemistry C,
Journal Year:
2022,
Volume and Issue:
127(1), P. 22 - 40
Published: Dec. 30, 2022
Step-scheme
(S-scheme)
heterojunctions
comprising
two
semiconductors
having
sets
of
charge
carriers
at
different
sites
with
an
outstanding
redox
capability
have
emerged
as
a
prospective
tactic
for
H2O2
production
and
antibiotic
remediation.
Herein,
0D/2D
Fe2O3
QD/B-g-C3N4
(F-BN)
was
successfully
fabricated
via
in
situ
nucleation
quantum
dots
(FQDs)
over
boron-doped
g-C3N4
(BCN)
sheets
photo-Fenton
amoxicillin
(AMX)
degradation.
Empirical
results
demonstrate
that
the
F-BN
composite
shows
superior
catalytic
activity
compared
to
parent
material
optimized
3F-BN
attains
best
generation
(729
μmol
solar-to-chemical
conversion
efficiency
(SCC)
0.12%)
AMX
degradation
(93%)
"k"
0.0891
min–1,
which
is
3.34
7.01
times
higher
than
those
pristine
materials.
The
could
be
attributed
effective
separation
utilization
excitons
through
S-scheme
transfer
pathway.
Moreover,
corridor
along
continuous
Fe3+/Fe2+
shuttling
responsible
activity.
Additionally,
influence
variation
experimental
conditions
also
studied
detail.
high
photocurrent,
lower
EIS
semicircle,
low
PL
intensity
indicate
e–/h+
material.
Furthermore,
scavenging
experiment
terephthalic
acid
(TA),
nitro
blue
tetrazolium
chloride
(NBT),
EPR
measurements
not
only
evidence
generated
reactive
oxygen
species
(•OH
•O2–)
participated
photocatalytic
activities
but
validate
charge-transfer
mechanism
further
confirmed
from
in-situ
XPS
analysis.
