Inorganic Chemistry,
Journal Year:
2024,
Volume and Issue:
63(26), P. 11930 - 11934
Published: June 14, 2024
Selective
capture
of
palladium
(Pd)
is
one
the
important
works
in
science
due
to
its
high
application
and
low
content
Earth's
crust.
To
this
end,
we
present
herein
a
new
Cu(I)-organic
framework
(ECUT-MOF-1)
by
introducing
pyridine
N
active
sites
chelate
Pd(II).
ECUT-MOF-1
demonstrated
that
maximal
adsorption
capacity
Pd(II)
was
350
mg/g
pH
=
3
solution.
In
addition,
kinetic
analysis,
cycle
performance,
selectivity,
mechanisms
were
also
investigated.
All
results
suggested
superior
recovery
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 22, 2024
Abstract
Polymer
adsorbents
functionalized
with
amidoxime
groups
are
widely
considered
to
have
the
most
industrial
potential
for
uranium
extraction
from
seawater.
However,
entanglement
upon
collapse
of
polymer
chain
in
seawater
greatly
reduces
utilization
ratio
ligands.
Herein,
a
novel
star‐shaped
molecular
brush
adsorbent
(
β
‐CD‐
g
‐PAO)
is
obtained
by
densely
grafting
polyamidoxime
(PAO)
chains
‐cyclodextrin
‐CD).
Experimental
and
theoretical
results
reveal
that,
contrast
conventional
linear
adsorbents,
star
high
density
PAO
side
enables
strong
steric
repulsion
between
chains,
leading
increased
persistence
length
disentanglement
chains.
As
result,
shows
higher
accessibility
adsorption
ligands
lower
energy,
achieving
an
capacity
up
944.75
mg
−1
uranium‐spiked
seawater,
surpassing
that
3.2
times.
Remarkably,
this
demonstrates
extraordinarily
10.9
only
1
day
natural
coupled
excellent
affinity
uranyl
ions
K
=
0.31
pM).
The
unique
topological
structure
design
provides
new
approach
solving
problem
low
functional
adsorbents.
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
34(14)
Published: Dec. 22, 2023
Abstract
The
complexity
of
nuclear
wastewater
treatment
motivates
the
design
and
synthesis
highly
selective
stable
uranium
adsorbents
to
provide
environmental
remediation.
Herein,
a
post‐synthetic
modification
method
is
adopted
synthesize
two
β‐ketoenamine
benzoxazole‐linked
COFs
decorated
with
abundant
phosphonic
groups
for
removal,
which
overcome
disadvantage
amidoxime
stronger
affinity
vanadium
than
uranium.
U‐uptake
capacity
β‐ketoenamine‐based
TpPa‐2OH‐PHos
reaches
410.9
mg
g
−1
(pH
5,
C
0
=
100
L
m/V
1/10
).
Notably,
TpDBD‐PHos
633.3
at
same
conditions.
More
synergistic
effect
between
benzoxazole
rings
may
be
responsible
good
adsorption
performance
TpDBD‐PHos.
Moreover,
exhibits
satisfactory
removal
rate
87.71%
in
actual
rainwater
samples.
X‐ray
pHotoelectron
spectroscopy
(XPS)
analysis
suggests
that
strong
interaction
U(VI)
oxygen/nitrogen
atoms
frameworks
plays
vital
role
TpDBD‐PHos,
agrees
well
results
density
functional
theory
(DFT)
calculations.
chemostability
excellent
selectivity
demonstrate
an
outstanding
candidate
from
contaminated
water
systems.
