Air
separation
and
carbon
dioxide
capture
are
essential
processes
used
in
various
industries.
In
particular,
the
supply
of
small-scale
medical
oxygen
generators
has
been
emphasized
during
worldwide
spread
respiratory-related
diseases,
such
as
COVID-19
pandemic.
This
study
investigated
adsorption
equilibria
kinetics
O2,
N2,
CO2
dynamic
performance
four
commercial
zeolite
LiX
pellets
because
pelletized
zeolites
can
be
different
by
their
heterogeneity
adding
binders
pelletizing
methods.
Three
binder
were
selected
compared
with
one
binderless
pellet
a
reference.
The
isotherms,
measured
using
volumetric
system
at
293–323
K
up
to
100
kPa,
correlated
dual-site
Langmuir
Sips
models.
For
all
adsorbents,
order
amount
isosteric
heat
was
≫
N2
>
O2.
Differences
capacity
clearly
observed,
indicating
that
had
highest
capacity.
According
analysis
non-isothermal
diffusion
model,
rate
faster
than
for
adsorbents.
difference
apparent
diffusional
constants
observed
low-pressure
range,
showing
among
owing
effects
adsorption,
dissipation,
thermal
resistance.
pellet,
which
relatively
slow
but
N2/O2
selectivity,
exhibited
best
breakthrough
experiments.
Environmental Science and Pollution Research,
Год журнала:
2024,
Номер
31(29), С. 41791 - 41823
Опубликована: Июнь 11, 2024
Abstract
Increasing
world
population,
urbanization,
and
industrialization
have
led
to
an
increase
in
demand
production
consumption,
resulting
industrial
solid
wastes
pollutant
levels
water.
These
two
main
consequences
become
global
problems.
The
high
Si
Al
content
of
suggests
that
they
can
be
used
as
raw
materials
for
the
synthesis
zeolites.
In
this
context,
when
literature
studies
conducted
obtain
synthetic
zeolites
are
evaluated,
it
is
seen
hydrothermal
method
generally
used.
order
improve
performance
terms
energy
cost,
time,
even
product
quality,
additional
methods
such
alkaline
fusion,
ultrasonic
effect,
microwave
support
been
developed.
synthesized
by
different
techniques
exhibit
superior
properties
surface
area
well-defined
pore
sizes,
thermal
stability,
cation
exchange
capacity,
regeneration
ability,
catalytic
activity.
Due
these
specific
properties,
recognized
one
most
effective
removal
pollutants.
toxic
heavy
metals
dyes
water
their
carcinogenic
effects
long-term
exposure
pose
a
serious
risk
living
organisms.
Therefore,
should
treated
at
specified
before
discharge
environment.
review
study,
processes
including
developed
from
were
evaluated.
Studies
using
health
environmental
risks
reviewed.
addition,
EPMA,
SEM,
EDX,
FTIR,
BET,
AFM,
29
27
NMR
techniques,
which
characterization
zeolites,
presented
thermodynamics
adsorption,
effect
temperature,
pH
investigated.
It
expected
consumption
reduced
large-scale
applications
alternative
zeolite
introduction
into
industry.
envisaged
utilizing
will
obtaining
green
technology.
use
wide
variety
applications,
especially
problems,
holds
great
promise.
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