Facile synthesis of geopolymer composites for effectual removal of Cr(VI) and Cd(II) ions from aqueous solutions
Sashi Yadav,
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Monika Dhawan,
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Vineet Kumar
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et al.
Discover Materials,
Journal Year:
2025,
Volume and Issue:
5(1)
Published: April 30, 2025
Language: Английский
Hydroxyapatite incorporated geopolymer porous adsorbent for efficient removal of copper ions and ciprofloxacin
Journal of the American Ceramic Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 19, 2025
Abstract
Sintering
is
a
promising
surface
modification
method
for
geopolymers
in
improving
their
ability
to
coadsorb
heavy
metals
and
antibiotics.
However,
geopolymer
usually
requires
high
sintering
temperature
(1000–1200°C),
making
it
energy
intensive.
Therefore,
researchers
are
paying
more
attention
on
the
synthesis
of
low‐temperature
sintered
adsorbents
In
this
regard,
calcium‐based
can
lower
due
its
less
thermal
stability
exhibit
pores
wider
cracks
during
heat
exposure.
no
research
has
been
done
development
porous
adsorbent
using
hydroxyapatite
(Hap).
Thus,
study
aims
sinter
composed
25%
metakaolin,
75%
silica
fume
2%
Hap
at
varied
temperatures
(300–800°C)
coadsorption
copper
ions
(Cu
2+
)
ciprofloxacin
(CIP).
The
effects
different
phase
stability,
pore
removal
efficiency
Cu
CIP
were
studied
both
single
binary
system.
characterization
techniques,
namely,
X‐ray
diffraction
(XRD),
Fourier‐transform
infrared
spectroscopy
(FTIR),
scanning
electron
microscope
(SEM),
Brunauer–Emmett–Teller
(BET),
tomographic
microscopy
(XTM)
employed
characterize
physicochemical
properties
adsorbents.
Based
experimental
results,
600°C
obtained
highest
(87%)
(99.53%)
comparison
oven‐cured
samples
with
(61.5%)
(96.62%).
Besides,
XTM
results
revealed
that
total
porosity
increased
by
60.1%
when
compared
sample.
complete
dehydration
calcium
aluminate
silicate
hydrate
(C–A–S–H)
gel
decomposition
calcite
created
microporous
structure,
enhancing
adsorption.
Hence,
simple
effective
strategy
developed
improve
adsorption
treatment
wastewater
comprises
CIP.
Language: Английский
Porous metakaolin-based geopolymers for adsorption of Contaminants of Emerging Concern from wastewaters
Applied Clay Science,
Journal Year:
2024,
Volume and Issue:
259, P. 107502 - 107502
Published: July 31, 2024
This
research
investigates
the
applicability
of
metakaolin-based
geopolymers
in
removal
organic
contaminants
emerging
concern
from
polluted
water
by
adsorption.
Ofloxacin
and
cortisone
were
chosen
as
model
molecules,
because
their
different
chemical
properties.
For
each
contaminant,
adsorption
was
first
tested
on
powdered
materials
with
mesoporosity.
The
two
drugs
eventually
evaluated
macroporous
geopolymer
monoliths,
obtained
using
commercial
olive
oil
H2O2
solution
pore-forming
agents
to
enhance
permeability
liquids
thus
favor
absorption
process.
Finally,
a
novel
ceramic
composite
diaphragm
prepared
tested.
Adsorption
experiments
demonstrated
larger
affinity
all
substrates
for
ofloxacin
than
cortisone.
Different
mechanisms
observed,
monolayer
antibiotic
cooperative
steroid,
capacities,
29(2)
mg
g−1
0.47(2)
g−1,
respectively.
efficiencies
monoliths
compared.
Satisfactory
drug
recoveries
(>99%)
also
under
realistic
conditions,
i.e.,
freshwater,
micrograms
per
liter
concentration.
Language: Английский
Geopolymer-Hydroxyapatite composites foams for wastewater remediation
Ceramics International,
Journal Year:
2024,
Volume and Issue:
50(23), P. 50377 - 50387
Published: Sept. 28, 2024
Language: Английский
Enhanced sequestration of ciprofloxacin from aqueous solution using composite montmorillonite-kaolin clay adsorbent
Toyin A. Oreofe,
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A. O. Arinkoola,
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Solomon Alagbe
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et al.
Nano-Structures & Nano-Objects,
Journal Year:
2024,
Volume and Issue:
40, P. 101364 - 101364
Published: Sept. 30, 2024
Language: Английский
Environmental geopolymer microsphere composite catalysts as highly efficient activators of peroxymonosulfate (PMS) for the degradation of Rhodamine B
Yutong Yang,
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Wenkang Qi,
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Yuanyuan Xie
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et al.
Journal of Materials Science,
Journal Year:
2024,
Volume and Issue:
59(44), P. 20575 - 20592
Published: Nov. 1, 2024
Language: Английский
Comparative Study of Cu Ion Adsorption by Nano-Hydroxyapatite Powder Synthesized from Chemical Reagents and Clam Shell-Derived Calcium Sources
Shih-Ching Wu,
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Hsueh-Chuan Hsu,
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Hong-Yi Ji
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et al.
Nanomaterials,
Journal Year:
2024,
Volume and Issue:
14(17), P. 1431 - 1431
Published: Sept. 1, 2024
The
increasing
contamination
of
water
sources
by
heavy
metals
necessitates
the
development
efficient
and
sustainable
adsorption
materials.
This
study
evaluates
potential
nano-hydroxyapatite
(HA)
powders
synthesized
from
chemical
reagents
(Chem-HA)
clam
shells
(Bio-HA)
as
adsorbents
for
Cu
ions
in
aqueous
solutions.
Both
were
using
microwave
irradiation
at
700
W
5
min,
resulting
nano-sized
rod-like
particles
confirmed
HA
X-ray
diffraction
(XRD).
Bio-HA
exhibited
higher
crystallinity
(67.5%)
compared
to
Chem-HA
(34.9%),
which
contributed
Bio-HA’s
superior
performance.
maximum
capacities
436.8
mg/g
426.7
Chem-HA,
determined
Langmuir
isotherm
model.
Kinetic
studies
showed
that
ion
followed
pseudo-second-order
model,
with
achieving
equilibrium
faster
displaying
a
rate
constant
(6.39
×
10⁻4
g/mg·min)
than
(5.16
g/mg·min).
Thermodynamic
analysis
indicated
process
was
spontaneous
endothermic,
requiring
less
energy
(ΔH°
=
39.00
kJ/mol)
43.77
kJ/mol).
Additionally,
activation
lower
(41.62
(46.39
kJ/mol),
suggesting
better
efficiency.
formation
new
Cu2(OH)PO4
phase
after
adsorption,
evidenced
XRD,
replaced
Ca
lattice.
These
findings
demonstrate
Bio-HA,
derived
natural
sources,
offers
environmental
benefits
recyclable
material,
enhancing
metal
removal
efficiency
while
contributing
sustainability
utilizing
waste
materials
reducing
an
impact.
Language: Английский