ACS Central Science,
Год журнала:
2023,
Номер
9(12), С. 2326 - 2332
Опубликована: Дек. 13, 2023
Electrochemical
uranium
extraction
from
seawater
provides
a
new
opportunity
for
sustainable
supply
of
nuclear
fuel.
However,
there
is
still
room
studying
flexible
electrode
materials
in
this
field.
Herein,
we
construct
amidoxime
group
modified
porous
aromatic
frameworks
(PAF-144-AO)
on
carbon
cloths
situ
using
an
easy
to
scale-up
electropolymerization
method
followed
by
postdecoration
fabricate
the
self-standing,
binder-free,
metal-free
electrodes
(PAF-E).
Based
architectural
design,
adsorption
sites
(amidoxime
groups)
and
catalytic
(carbazole
are
integrated
into
PAF-144-AO.
Under
action
alternating
electric
field,
uranyl
ions
selectively
captured
PAN-E
subsequently
transformed
Na2O(UO3·H2O)x
precipitates
presence
Na+
via
reversible
electron
transfer,
with
capacity
12.6
mg
g–1
over
24
days
natural
seawater.
This
adsorption–electrocatalysis
mechanism
also
demonstrated
at
molecular
level
ex
spectroscopy.
Our
work
offers
effective
approach
designing
organic
polymer
electrodes,
which
hold
great
potential
field
electrochemical
Journal of Materials Chemistry A,
Год журнала:
2023,
Номер
11(42), С. 22551 - 22589
Опубликована: Янв. 1, 2023
Our
analysis
of
the
current
literature
shows
that
advances
in
extractive
technologies
for
U/Li
recovery
lie
at
intersection
between
molecular
simulation,
nanotechnology
and
materials
science,
electrochemistry,
membrane
engineering.
Cell Reports Physical Science,
Год журнала:
2023,
Номер
4(1), С. 101220 - 101220
Опубликована: Янв. 1, 2023
Amidoxime-functionalized
adsorbents
have
been
pursued
for
uranium
extraction
from
seawater,
though
competitive
adsorption
of
vanadium
and
copper
ions
remains
an
issue.
Herein,
we
report
the
successful
design
a
family
covalent
organic
framework
(COF)
adopting
alternative
chelating
strategy
binding
comprising
hydrazine-carbonyl
sites
with
assistant
groups
enhanced
uptake.
A
COF
possessing
hydroxypropoxy
(denoted
as
COF-R5)
showed
exceptional
selectivity
over
other
metal
ions,
resulting
in
fast
kinetics
high
uptake
capacity
11.3
mg/g
distribution
coefficient
9.2
×
105
mL/g
which
exceeded
most
COFs
previously
reported
literature.
Mechanism
studies
revealed
that
UO22+
at
COF's
through
hydrogen
bonding
interactions
charge
stabilization
effects,
thus
boosting
overall
affinity
capacity.
Results
validate
developed
"uranium
nanotraps"
potential
large-scale
extraction.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Янв. 11, 2024
Abstract
With
the
rapid
development
of
nuclear
energy,
problems
with
uranium
supply
chain
and
waste
accumulation
have
motivated
researchers
to
improve
separation
methods.
Here
we
show
a
paradigm
for
such
goal
based
on
in-situ
formation
π
-
f
conjugated
two-dimensional
uranium-organic
framework.
After
screening
five
-conjugated
organic
ligands,
find
that
1,3,5-triformylphloroglucinol
would
be
best
one
construct
framework,
thus
resulting
in
100%
removal
from
both
high
low
concentration
residual
far
below
WHO
drinking
water
standard
(15
ppb),
97%
capture
natural
seawater
(3.3
ppb)
record
uptake
efficiency
0.64
mg·g
−1
·d
.
We
also
can
overcome
ion-interference
issue
as
presence
massive
interference
ions
or
21-ions
mixed
solution.
Our
finds
confirm
superiority
our
approach
over
established
ones,
will
provide
fundamental
molecule
design
upon
metal-organic
framework
chemistry.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(29)
Опубликована: Март 15, 2024
Abstract
Environmental
protection
and
resource
reclamation
make
the
extraction
of
uranium
from
uranium‐containing
wastewater
be
a
key
role
in
nuclear
chemistry
industry.
Although
previous
studies
have
revealed
several
effective
methods
materials
for
such
use,
however,
few
are
concerned
about
discharge
issues.
In
fact,
direct
treated
into
environment
is
still
not
green
way.
Here,
an
innovative
conversion
approach
shown,
which
can
simultaneously
achieve
to
valuable
chemical.
This
concept
implemented
by
azobenzene‐pendent
covalent
organic
framework,
showing
smart
trans
‐to‐
cis
photoresponsive
properties
both
space
electronic
structure
consequently,
largely
enhanced
efficiency
under
UV
irradiation,
relative
visible
light
irradiation.
real
wastewater,
material
found
give
selective
100%
H
2
O
generation
(1872.3
µmol
g
−1
h
).
The
mechanism
due
unique
photocatalysis
coupling
between
reduction
reaction
(URR),
aiming
at
recovery
or
removal,
water
oxidation
(WOR),
targeting
chemical
.
