Synthesis of iron-modified montmorillonite/Al2O3 composite adsorbents and their phosphorus adsorption performance study
Abstract
The
presence
of
excessive
phosphate
in
aquatic
systems
can
trigger
eutrophication
processes,
causing
detrimental
impacts
on
ecological
balance.
This
research
developed
an
innovative
phosphorus-adsorbing
composite
material
through
iron-modified
montmorillonite
integrated
with
Al2O3,
synthesized
via
surface
modification
coupled
hydrothermal
calcination
(Fe/AlPMt),
for
phosphorus
management.
pH
optimization
experiments
demonstrated
Fe/AlPMt's
effective
removal
capability
across
extended
acidic
range
(pH
3.0–6.0).
displayed
superior
selectivity
compared
to
competing
anions.
Kinetic
analysis
revealed
that
the
adsorption
process
conformed
a
second-order
reaction
model,
particle
internal
diffusion
identified
as
dominant
mechanism.
Equilibrium
studies
indicated
satisfactory
alignment
both
Freundlich
and
Tempkin
isotherm
models
adsorption.
Field
testing
lake
water
achieved
remarkable
99%
elimination
at
0.3
g/L
dosage.
Adsorption
mechanisms
involved
multiple
pathways:
electrostatic
attraction,
ligand
substitution
reactions,
precipitate
formation
surfaces.
maintained
95.8%
efficiency
after
five
regeneration
cycles,
demonstrating
robust
recyclability.
These
results
position
Fe/AlPMt
viable
solution
phosphorus-contaminated
wastewater
remediation.
Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown
Published: April 25, 2025
Language: Английский
