International Journal of Environmental & Analytical Chemistry,
Journal Year:
2023,
Volume and Issue:
unknown, P. 1 - 18
Published: July 17, 2023
Designing
and
developing
clay-based
adsorbents
with
a
strong
preference
for
removing
copper
zinc
metal
ions,
reduced
cost,
eco-friendliness,
good
recyclability
is
strategy
water
remediation.
Herein,
halloysite
nanotubes
(HNT)
were
activated
by
(3-
chloropropyl)
trimethoxy
silane
(CPTM)
as
linker
polyethyleneimine
to
give
HN-PEI.
The
hybrid
organic/inorganic
sorbent
HN-PEI
was
analysed
Fourier-transform
infrared
spectroscopy,
CHN/O
(elemental
analysis),
scanning
electron
microscopy,
textural
properties
(via
the
Brunauer
–
Emmett
Teller
technique),
X-ray
diffraction,
thermogravimetry
coupled
differential
calorimetry.
HN-PEI's
show
specific
surface
of
10.92
m2/g
pore
size
18.2
nm
compared
its
Pristine
HNT
(65.33
m2/g)
(⁓10.1
nm),
respectively
dominant
mesoporous
structure.
selectivity
sorption
characteristics
Cu(II)
Zn(II)
ions
exploited,
while
exhibited
remarkable
improvement
in
terms
these
from
aqueous
media.
At
pH
4.5,
capacities
2.8
mmol
g−1
1.8
g−1,
equilibrium
reached
within
120
150
min,
respectively.
There
an
acceptable
fitting
pseudo-second-order
Langmuir
equations,
experimental
data
enabled
mono-layer
chemisorption
reactions.
exothermic
spontaneous.
shows
high
durability
over
multiple
cycles,
after
3
sorption/desorption
efficacy
decreased
less
than
6%
using
HCl
(1
M)
H2SO4
(1.5
Zn(II).
According
bi-system
solution
test,
KSC(Cu(II)/Zn(II))
⁓2.0.
Finally,
had
excellent
efficiency
Cu(II),
Pb(II),
especially
Cu(II).
Applied Water Science,
Journal Year:
2025,
Volume and Issue:
15(2)
Published: Jan. 25, 2025
Abstract
Newly
modified
magnetic
chitosan
nanoparticles
were
synthesized
for
the
high-efficiency
removal
of
cadmium
ions
from
aquatic
environments.
The
structure
and
morphology
composites
confirmed
using
FTIR,
TGA,
XRD,
BET,
SEM,
TEM,
SAED
pattern
analysis,
zeta
potential.
Under
optimal
conditions
(pH
=
6.0,
contact
time
120
min,
sorbent
dosage
0.005
g/100
mL),
maximum
Cd
(II)
by
samples
MC,
SA,
SB
was
90.8%,
95%,
95.15%,
respectively.
kinetic
data
at
pH
6
could
be
accurately
described
a
pseudo-second-order
equation,
while
Langmuir
isotherm
model
best
represented
sorption
process.
Q
max
values
nanocomposites
S*,
S3,
S4,
S*t,
S3t,
S4t
243.90,
250,
270.27,
212.76,
237.09,
238.09,
thermodynamic
analysis
these
shows
that
process
exothermic
(negative
∆H°)
−
15.148,
13.60,
13.18,
18.163,
16.820,
16.06
kJmol
−1
,
This
implies
diffusion
Cd(II)
on
decreased
with
temperature
rise.
positive
ΔS⁰
152.37,
147.80,
146.83,
160.94,
157.08,
154.93
antimicrobial
properties
functionalized
sorbents
SA
evaluated
measuring
zone
inhibition
(ZOI)
against
Staphylococcus
aureus
Klebsiella
pneumoniae,
representing
Gram-negative
Gram-positive
bacteria,
showed
promising
activity,
demonstrating
clear
zones
(20
±
0.2
18
0.4
mm),
(22
20
mm)
S.
K.
Additionally,
demonstrated
moderate
antioxidant
highest
scavenging
percentages
94.20%
96.63%,
respectively,
concentration
1000
µg/mL,
as
assessed
DPPH
method.
