Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 20, 2025
Abstract
Functionalized
amidoxime
[AO,
R−C(NH
2
)═N(OH)]
is
widely
used
for
uranium
extraction
from
seawater,
but
increasing
the
effective
functional
sites
high
AO
utilization
in
adsorbents
remains
challenging.
This
study
introduces
a
hydrogen
bond
reconstruction
strategy
to
enhance
efficiency
of
AO‐modified
polyacrylonitrile
(PAN)
fibers
by
blending
with
polyvinyl
alcohol
(PVA).
The
PAN/PVA
are
synthesized
via
electrospinning,
followed
amidoximation
on
PAN
prepare
PAN‐AO/PVA
adsorbents.
These
materials
can
extract
uranyl
ions
uranyl‐carbonate
complex
achieving
an
adsorption
capacity
21.0
mg
g⁻¹
under
simulated
seawater
conditions
330
ppb
concentration
over
24
h.
PVA
increases
4
times
(from
1/291
1/69),
exceeding
most
reported
values.
adsorbent
also
shows
excellent
reusability,
retaining
95%
after
seven
adsorption–desorption
cycles.
Quantum‐chemical
studies
based
density
theory
reveal
that
modulates
bonding
network
shifting
intramolecular
bonds
PAN‐AO
intermolecular
ones
PVA,
permeability
and
exposing
more
active
N
O
sites.
Additionally,
PVA's
hydroxyl
groups
coordinate
UO₂
⁺,
enhancing
through
enthalpy‐entropy
synergy
relationship.
offers
practical
approach
improving
seawater.
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(32)
Опубликована: Май 5, 2023
Abstract
In
this
study,
graphene
oxide
(GO)
and
polyacrylamide/polyacrylic
acid
(PAM/PAA)
are
used
to
prepare
hydrogels
with
photothermal
conversion
properties
for
highly
efficient
uranium
extraction
from
seawater.
Zwitterionic
2‐methacryloyloxy
ethyl
phosphorylcholine
(MPC)
is
introduced
in
the
PAM/PAA/GO
hydrogel
obtain
PAM/PAA/GO/MPC
(PAGM),
exhibiting
good
antibacterial
properties.
PAGM
demonstrates
specific
adsorption
of
(VI)
(U(VI)).
Under
light
conditions,
capacity
reaches
196.12
mg
g
−1
(pH
=
8,
t
600
min,
C
0
99.8
L
,
m/v
0.5
).
The
only
160.29
under
dark
conditions
22.5%
higher
than
that
dark.
process
fitted
using
Langmuir
pseudo‐second‐order
models.
Furthermore,
exhibits
repeatability
stability
after
five
adsorption–desorption
cycles.
a
U(VI)
6.1
storage
one
month
natural
X‐ray
photoelectron
spectroscopy
(XPS)
results
demonstrate
coordination
amino,
carboxyl,
hydroxyl
groups
primary
mechanism
adsorption.
confirmed
through
detailed
density
functional
theory
calculations.
durability,
high
efficiency,
properties,
Thus,
it
promising
candidate
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(19)
Опубликована: Янв. 8, 2024
Abstract
Photocatalytic
uranium
extraction
from
seawater
is
an
ideal
strategy
to
obtain
resources.
Herein,
the
cyano‐functionalized
graphitic
carbon
nitride
(g‐C
3
N
4
‐CN)
with
isosite
structure
of
adsorption
and
photoreduction
for
U(VI)
successfully
prepared
achieve
efficient
photocatalytic
seawater.
As
key
structure,
cyano
group
not
only
dramatically
promotes
separation
photogenerated
charges
g‐C
‐CN
enriched
electrons
around
it,
but
also
greatly
improves
capacity
selectivity
over
by
complexing
U(VI).
Therefore,
exhibits
stable
reduction
performance,
a
saturated
2644.3
mg
g
−1
,
significantly
higher
than
most
reported
‐based
photocatalysts.
Moreover,
it
performs
well
in
solar
light‐driven
actual
Briefly,
this
work
illustrates
importance
constructing
improving
performance.
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.
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
.
