It
remains
challenging
for
the
fabrication
of
metal-organic
framework
(MOF)/semiconductor
heterojunction
photocatalysts
with
close
contact
interfaces.
In
this
work,
a
novel
MOF/semiconductor
photocatalyst
consisting
H2O2-modified
TiO2
nanotubes
(H2O2-TNTs)
and
MIL-88B(Fe)-NH2
(labeled
as
H-T/M)
was
firstly
constructed
based
on
hydrogen-bonded
combination
between
O
atoms
from
–OOH
groups
resulting
H2O2
absorbed
surface
H
–NH2
group
in
MOF.
The
significantly
enhanced
photocatalytic
property
H-T/M
reducing
Cr(VI)
under
visible
light
irradiation
could
be
ascribed
to
accelerated
interfacial
electron
transfer
dynamics
by
channel
hydrogen
bonds
(N···H–O–O–Ti),
which
extracted
femtosecond
transient
absorption
spectroscopy
(fs-TAS).
Moreover,
built-in
electric
field
differences
charge
density
functional
theory
(DFT)
calculations
provide
driving
force
transfer.
Analytical Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 7, 2025
Rapid
and
accurate
analysis
of
trace
targets
in
complex
samples
remains
an
enormous
challenge.
Herein,
the
calix[x]arene-based
magnetic
cross-linked
polymer
decorating
AgNPs,
abbreviated
Fe3O4–CXA-DAB@AgNPs
nanosponge,
was
developed
for
fast
surface-enhanced
Raman
scattering
(SERS)
samples.
The
nanosponge
surface
constructed
by
high-density
CXA
units
with
special
cavity
size
structure,
which
could
selectively
recognize
enrich
to
sensing
host–guest
effect
molecule
interactions.
Fe3O4–C4A-DAB@AgNPs
showed
significant
SERS
enhancement
choline
chloride
(ChCl)
succinylcholine
(SCC)
factor
(EF)
2.9
×
107
6.3
106,
respectively.
Fe3O4–C6A-DAB@AgNPs
exhibited
high
activity
thiabendazole
EF
7.6
106.
Introducing
recognition–enrichment–separation
sensing,
achieve
rapid
enrichment
within
6–8
min.
Also,
good
stability
detection
relative
standard
deviations
less
than
6.3%
intra-batch
(n
=
25)
6.8%
inter-batch
15).
Benefiting
from
these
merits,
employed
ChCl
SCC
real
limits
were
0.62
μg/L
2.0
SCC.
found
feed
sample
recoveries
85.3–108%,
serum
85.7–111%.
methods
provided
a
reference
selective
regulating
calix[x]arenes
satisfy
different
molecules
quantification
strategy
integrating
pretreatment
technology
all-in-one.
Chinese Journal of Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 21, 2025
Comprehensive
Summary
Photocatalytic
synthesis
of
hydrogen
peroxide
(H
2
O
)
from
air
and
water
presents
a
sustainable
efficient
alternative
to
the
traditional
anthraquinone
method.
Therefore,
design
photocatalysts
for
H
production
are
important.
In
this
work,
we
apply
nitrogen‐site
engineering
strategy
achieve
high‐performance
by
synthesizing
three
imine‐
linked
oligo(phenylenevinylene)‐based
covalent
organic
frameworks
(OPV‐COFs)
doped
with
different
numbers
nitrogen
atoms
(denoted
as
COF‐920‐
n
N,
=
0,
1,
3).
characterization
confirmed
high
crystallinity
porosity
COFs,
critical
photocatalysis.
Each
OPV‐COF
exhibited
ability
rapidly
synthesize
using
water,
COF‐920‐1N
achieving
highest
rate
4288
μmol·g
–1
·h
under
visible
light,
higher
than
those
most
other
reported
COFs.
Mechanism
studies
demonstrated
that
introduction
pyridine
at
junction
changes
electronic
structure
electron
transfer
path
within
enhancing
photogenerated
mobility
reducing
electron‐hole
recombination.
This
study
not
only
pioneers
class
OPV‐COFs
photocatalytic
,
but
also
sets
foundational
rational
COFs
in
applications.
