Materials,
Год журнала:
2023,
Номер
16(6), С. 2142 - 2142
Опубликована: Март 7, 2023
Waste
fly
ash,
with
both
low
(with
the
addition
of
vermiculite)
and
high
contents
unburned
coal,
were
subjected
to
hydrothermal
syntheses
aiming
obtain
zeolite
composite
materials-zeolite
+
vermiculite
(NaX-Ver)
carbon
(NaX-C).
The
composites
compared
parent
obtained
from
waste
ash
a
content
(NaX-FA).
In
this
study,
physicochemical
characteristics
materials
evaluated.
potential
application
investigated
zeolites
for
adsorption
ammonium
ions
aqueous
solutions
was
determined.
Composite
NaX-Ver
NaX-FA
characterized
by
comparable
capacities
toward
38.46
40.00
mg
(NH4+)
g-1,
respectively.
nearly
2-fold
lower
capacity
NaX-C
(21.05
g-1)
probably
result
availability
ion
exchange
sites
within
material.
Adsorbents
also
regenerated
using
1
M
NaCl
solution
at
pH
10
3
cycles
adsorption-desorption
experiments,
which
proved
only
small
reduction
in
properties.
This
study
follows
current
trend
utilization
(fly
ash)
removal
pollutants
respect
their
reuse,
remains
line
goals
circular
economy.
Arabian Journal of Chemistry,
Год журнала:
2023,
Номер
16(8), С. 104959 - 104959
Опубликована: Май 3, 2023
This
study
presents
a
method
that
will
allow
for
the
sustainable
utilization
of
rice
husk
ash-SiO2
(RHAS),
an
agricultural-waste–derived
material,
as
bulky
solid
SiO2
source
in
zeolite
beta
(BEA)/Fe3O4
composite
(magnetic
RHAS-BEA)
synthesis
via
dry-gel
conversion
removal
paraquat,
typical
herbicide,
from
aqueous
solutions.
Ultrasonic
waves
were
used
to
facilitate
formation
uniform
Fe3O4-contained
dry
precursor
gel
before
converting
magnetic
BEA
first
time.
Magnetic
RHAS-BEA
was
then
characterized
and
compared
with
non-magnetic
sample
(RHAS-BEA)
using
X-ray
diffraction
field-emission
scanning
electron
microscopy.
In
terms
adsorption,
we
found
paraquat
had
high
adsorption
rate
on
samples
conformed
pseudo-second-order
kinetic
model.
The
behavior
synthesized
obeyed
Langmuir
isotherm
adsorbents
reusable
at
least
four
cycles,
thermal
regeneration
450
°C.
inclusion
Fe3O4
particles
disrupted
neither
crystallization
nor
enabled
easy
collection
external
magnet.
Heliyon,
Год журнала:
2023,
Номер
9(10), С. e20572 - e20572
Опубликована: Окт. 1, 2023
The
presence
of
pesticides
in
our
environment
is
a
consequence
intensive
industrial
and
civilizational
development,
necessitating
the
search
for
effective
safe
methods
to
remove
them.
We
suggest
utilizing
zeolite
X
zeolite-carbon
composite,
obtained
through
chemical
transformation
fly
ash,
as
pesticide
sorbents.
To
increase
sorption
efficiency
2,4-dichlorophenoxyacetic
acid
(2,4-D),
2-methyl-4-chlorophenoxyacetic
(MCPA),
carbendazim,
simazine,
we
functionalized
materials
with
cationic
(hexadecyltrimethylammonium)
nonionic
(Triton
X-100)
surfactants.
used
transmission
electron
microscopy
(TEM),
X-ray
photoelectron
spectroscopy
(XPS),
thermogravimetric/differential
thermal
analysis
(TG/DTA)
point
zero
charge
(pHpzc)
characterize
sorbent
materials.
Our
results
indicate
that
surfactants
significantly
enhance
adsorption
2,4-D
MCPA.
In
contrast,
carbendazim
simazine
exhibit
maximum
on
unmodified
composite.
mechanism
intricate,
physical
predominating,
primarily
due
electrostatic
interactions
between
protonated
binding
sites
adsorbents
negatively
charged
molecules.
Regeneration
tests
demonstrated
ethanol
most
regenerating
composite
adsorbed
MCPA
2,4-D,
while
regeneration
was
not
possible.
Adsorbents
can
be
regenerated
using
both
methods,
but
more
efficient.
Utilizing
from
waste,
such
could
provide
an
efficient
way
environment.
