Bulletin of the Korean Chemical Society,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 19, 2024
Abstract
To
develop
an
adsorbent
for
Li
+
recovery
from
seawater
and/or
spent
lithium
batteries,
a
benzo‐12‐crown‐4
ether
(B12C4)
moiety
was
immobilized
with
silica
(immobilization
yield:
0.70
meq
g
−1
).
Compared
to
pure
silica,
the
resulting
(FB12C4‐SG)
had
reduced
Brunauer–Emmett–Teller
surface
area
(500
vs.
180
m
2
)
and
pore
volume
(0.75
0.26
cm
3
The
adsorption
reached
equilibrium
at
31
mg
after
h
(1000
ppm
solution).
behavior
well
explained
by
pseudo‐second‐order
kinetics
Langmuir
model
(maximum
capacity:
33
material
exhibited
/Na
selectivity
factor
of
4.2
high
chemical
stability
under
acidic
regeneration
conditions
(1.0
N
HCl
Abstract
Sluggish
internal
mass
transfer
within
granulated
adsorbents
constrains
the
efficiency
of
Li
+
extraction
from
low‐grade
salt
lakes.
In
this
study,
diffusion
behavior
simulations
using
finite
element
analysis
indicated
that
reducing
granule
dimensionality
enhanced
in
aluminum‐based
lithium
adsorbents,
with
ionic
strength
as
driving
force.
Hence,
low‐dimensional
adsorbent
granules
(LD‐LDHs)
fast
transport
channels
and
highly
accessible
adsorption
sites
were
directionally
prepared
via
a
wet‐spinning
method.
Adsorption
kinetics
suggested
LD‐LDHs
reduced
resistance
achieved
equilibrium
less
than
30
min,
which
was
significantly
shorter
36
h
required
for
larger
by
conventional
extrusion
molding,
while
maintaining
performance
encapsulated
active
components.
During
continuous
Qarhan
old
brine,
reached
saturation
60
1.8‐fold
increased
working
capacity,
desorption
solution
higher
quality,
favorable
subsequent
carbonate
production
processes.
Separation and Purification Technology,
Год журнала:
2024,
Номер
352, С. 128064 - 128064
Опубликована: Май 22, 2024
To
harness
the
abundant
lithium
(Li)-containing
aqueous
resources
and
meet
growing
demand
for
Li,
membrane-based
processes
selective
Li
recovery
have
garnered
extensive
attention.
The
incorporation
of
sulfonate
groups
into
membranes
is
a
crucial
strategy
fine-tuning
ion
selectivity,
which
has
been
widely
used
in
nanofiltration
electrodialysis
separation;
however,
its
potential
membrane
capacitive
deionization
(MCDI)
process
remains
largely
unexplored.
This
study
bridges
this
research
gap
by
integrating
activated
carbon
(AC)
electrodes
(CDI)
with
poly
ether
ketone
(SPEK)
membranes,
featuring
varying
degrees
sulfonation
(SPEK-20,
SPEK-40,
SPEK-60),
evaluating
their
performance
using
Li/M
(M
representing
competing
cations
such
as
Na,
K,
Mg,
Ca)
binary
solutions.
synthesized
underwent
thorough
characterization,
confirming
successful
formation
SPEK
membrane,
revealing
layer
cross-section
thickness
below
10
µm,
identifying
hydrophilicity
AC/SPEK
electrode
surface.
MCDI
results
unveiled
significant
impact
incorporating
on
monovalent-cation
feeds
compared
to
bare
AC
electrodes,
boosting
removal
rate
selectivity
Li/K
feed
over
210
%
120
%,
respectively.
Meanwhile,
demonstrate
preferable
affinity
capturing
releasing
divalent
ions,
variations
degree
exerting
greater
influence
cases
involving
cations.
