Radiochimica Acta,
Journal Year:
2024,
Volume and Issue:
112(11), P. 827 - 839
Published: July 7, 2024
Abstract
This
work
synthesized
MnO
2
modified
winter
melon-derived
biochar
(MnO
@WBC)
using
potassium
permanganate
oxidation/hydrothermal
method
for
uranium(VI)
removal.
The
factors
influencing
adsorption
by
@WBC,
including
pH,
adsorbent
dosage,
time,
temperature,
and
initial
U(VI)
concentration
were
explored.
material’s
performance
was
characterized,
the
underlying
mechanism
of
removal
analyzed
various
techniques.
characterization
results
indicated
that
@WBC
exhibited
excellent
dispersibility,
suggesting
effectively
prevented
WBC
aggregation
enhanced
reactive
surface
area,
providing
more
active
sites
can
promote
complexation
U(VI).
process
suggested
a
dominant
role
chemical
adsorption.
Freundlich
isotherm
model
demonstrated
high
degree
alignment
with
observed
behavior,
indicating
predominantly
multilayer
process.
Thermodynamic
studies
spontaneous
endothermic
XPS
analysis
primarily
due
to
formation
stable
complexes
C–O,
Mn–O–H
C=O.
removed
U(VI),
achieving
maximum
capacity
240.86
mg
g
−1
at
pH
5.0.
These
findings
provided
theoretical
basis
treatment
wastewater
contaminated
Materials Horizons,
Journal Year:
2024,
Volume and Issue:
11(14), P. 3364 - 3374
Published: Jan. 1, 2024
Efficient
uranium
extraction
from
seawater
is
critical
for
the
development
of
nuclear
industry.
Herein,
a
polydopamine/salicylaldoxime
decorated
hierarchical
zeolitic
imidazolate
framework-8
(H-PDA/SA-ZIF-8)
constructed
by
using
controlled
etching
process.
Benefiting
combination
PDA/SA
and
(ZIF-8),
as
well
process,
H-PDA/SA-ZIF-8
possesses
multiaffinity
sites,
excellent
specific
surface
area
(1234.92
m2
g-1),
pore
structure.
The
exhibits
adsorption
capacity
(Qm
=
869.6
mg
selectivity,
reusability
in
adsorption.
process
fits
very
with
Langmuir
isotherm
model
pseudo-second-order
models,
equilibrates
within
20
min
(C0
L-1).
Furthermore,
shows
remarkable
antibacterial
ability.
Impressively,
to
natural
reaches
6.9
g-1
after
circulation
15
days.
Therefore,
promising
fascinating
material
seawater.
