Water Practice & Technology,
Год журнала:
2024,
Номер
19(9), С. 3676 - 3692
Опубликована: Июль 4, 2024
ABSTRACT
In
this
work,
a
magnetic
nanocomposite
adsorbent
was
synthesized
by
crosslinking
graft
copolymerization
of
gelatin
and
acrylamide
onto
graphene
oxide
nanosheets
in
the
presence
Fe3O4
nanoparticles.
The
structure
nanocomposites
characterized
using
FTIR,
SEM,
TEM,
XRD,
VSM
point
zero
charge
(pHpzc).
prepared
were
employed
as
bioadsorbents
for
adsorption
copper
ions.
effects
parameters
under
different
conditions
studied
detail
through
batch
experiments.
maximum
ion
capacity
259
g.
g−1
achieved
optimum
that
found
to
be:
pH=8.0,
concentration=80
mg
L−1,
dosage=0.5
mg.
contact
time=2
hours,
temperature=60
°C.
kinetics
isotherms
fitted
well
at
various
concentrations
(40,
80
160
L−1)
second-order
Langmuir
models
with
R2=0.9991
0.9928,
respectively.
Moreover,
thermodynamic
show
process
spontaneous
endothermic.
addition,
adsorbents
depicted
excellent
regeneration
ability
after
six
adsorption-desorption
cycles
maintained
89%
its
initial
capacity.
conclusion,
obtained
results
confirmed
environmentally
friendly
high
capacities
could
be
effective
elimination
ions
from
wastewaters.
Heliyon,
Год журнала:
2024,
Номер
10(15), С. e35169 - e35169
Опубликована: Июль 26, 2024
Novel
silicone-modified
biochar
adsorbents
(BPS-MBCs)
were
prepared
by
utilizing
waste
black
peanut
shell
(BPS)
as
a
raw
and
gamma-amino-propyl
triethoxysilane
(silicone)
an
inorganic
modifier.
The
novelty
of
this
work
is
that
the
incorporation
silicone
into
BPS
can
rise
specific
surface
area
porosity
BPS-MBCs
elevate
their
adsorptions
for
copper
(II).
Sorption
kinetics
data
(II)
molded
using
five
kinetic
equations
[i.e.
Lagergren
1st-order
2nd-order,
intraparticle
diffusion
(IN-D),
Elovich,
Diffusion-chemisorption].
equilibrium
adsorption
analyzed
two-parameter
isotherm
Langmuir,
Freundlich,
Dubinin-Radushkevich,
Temkin]
three-parameter
Sips,
Redlich-Peterson
Toth
models.
It
was
validated
sorption
on
matched
better
with
pseudo-2nd-order
kinetic,
Diffusion-chemisorption
Langmuir
maximal
q
Abstract
Alfa
fiber
is
used
as
a
low‐cost
precursor
for
the
production
of
activated
carbon
(ACAF)
through
chemical
activation
with
zinc
chloride
at
500
°C.
In
this
context,
ACAF
was
applied
to
elimination
Cu(II)
from
water
and
compared
commercial
(CAC).
The
porosity,
structural,
thermal
stability
were
characterized
by
SEM,
FTIR,
BET,
TGA
analysis.
surface
oxygen
functional
groups
analyzed
using
Boehm's
titration.
Batch
experiments
in
stirred
reactor
performed
study
effect
operating
parameters
on
adsorption
process:
pH
(2–6),
temperature
(25–55
°C),
amount
adsorbent
(0.03–0.1
g).
Isotherms
models:
Langmuir,
Freundlich,
Dubinin–Raduskevich
tested.
results
revealed
that
had
high
area
1013
m
2
/g
CAC
adsorbent,
978.85
/g.
isotherms
kinetics
onto
both
adsorbents
can
be
described
well
Langmuir
isotherm
pseudo‐second‐order
models.
monolayer
maximum
capacity
toward
41.666
21.276
mg/g
328
K,
respectively.
Thermodynamics
indicated
spontaneous
endothermic.
mechanism
ions
an
electrostatic
interaction.
Journal of Applied Polymer Science,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 10, 2025
ABSTRACT
In
order
to
develop
an
effective
method
remove
Pb(II)
from
water,
researchers
created
a
novel
composite
material
(FMHCA)
using
hydrochloric
acid‐activated
attapulgite
(HATP)
and
hydrochar
(HC)
loaded
with
Fe/Mn
oxides.
The
adsorption
capacities
of
three
adsorbents
were
comparatively
analyzed:
HATP,
attapulgite‐hydrochar
(HCA),
Fe/Mn‐modified
HCA
(FMHCA).
microstructure,
elemental
composition,
pore
characteristics
determined
by
SEM–EDX,
XPS,
XRD,
FTIR,
BET
analyses.
beneficial
functional
groups,
including
Fe‐Mn
oxides,
hydroxyl,
carboxyl
present
in
the
adsorbent
highly
conducive
removal.
test
demonstrated
that
ratio
HATP
HC
preparation
FMHCA
at
1:3
was
optimal,
had
higher
capacity
for
(
Q
m
=
320.85
mg/g)
than
both
HCA.
followed
pseudo‐second‐order
model,
isothermal
model
exhibiting
strong
correlation
Langmuir
model.
This
suggests
process
is
monolayer
chemisorption.
findings
this
study
offer
technical
support
cost‐effective
efficient
removal
heavy
metals
water.
