Chimica Techno Acta,
Journal Year:
2024,
Volume and Issue:
11(4)
Published: Nov. 22, 2024
Low
biodegradability
of
several
dyes
leads
to
their
accumulation
in
water,
causing
ecological
and
health
damage.
The
adsorption
and,
particular,
biosorption
processes
are
widely
applied
for
the
wastewater
treatment.
This
article
presents
first
comparative
study
Allura
red
dye
removal
under
neutral
pH
at
25
oC
applying
novel
biosorbents:
carboxyethyl
chitosan
hydrogel
(CEC)
cryogel
cross-linked
with
butanediol-1,4
diglycidyl
ether
(DEB-CEC).
gels
were
synthesized
“green”
manner,
characterization
revealed
porous
structure
high
swelling
both
biopolymer
compositions,
which
properties
important
adsorption.
kinetic
studies
demonstrated
that
rate
DEB-CEC
is
better
represented
by
pseudo-second-order,
while
CEC
followed
pseudo-first-order
kinetics.
isotherm
Red
suited
Temkin
model
samples,
maximum
capacity
22.523
mg/g
(45.4
μmol/g)
10.482
(21.1
DEB-CEC,
respectively.
results
polymers
can
be
used
as
biodegradable
eco-friendly
biosorbents
from
aqueous
solutions,
making
these
promising
treatment
prevention
azo-dye
environmental
pollution.
ACS Omega,
Journal Year:
2024,
Volume and Issue:
9(13), P. 15175 - 15190
Published: March 18, 2024
The
purpose
of
this
research
was
to
learn
more
about
the
primary
and
secondary
properties
Moroccan
natural
clay
in
an
effort
better
investigate
innovative
adsorbents
gain
access
ideal
adsorption
system.
Scanning
electron
microscopy
coupled
with
energy-dispersive
X-ray
spectroscopy
analysis
(SEM-EDX)
fluorescence
were
employed
for
identification.
SEM
revealed
grains,
including
tiny
particles
unevenly
shaped
sticks.
First-
second-order
rate
laws,
representing
two
distinct
kinetic
models,
applied
approach.
Adsorption
dye
MB
onto
studied,
results
agreed
2
s
order
model.
significant
correlation
coefficients
support
inference
that
process
governed
by
Langmuir
Subsequent
DFT
analyses
demonstrated
methylene
blue
dye's
HOMO
LUMO
surfaces
are
dispersed
across
most
components,
pointing
a
strong
interaction
clay.
To
determine
how
might
be
adsorbed
clay,
we
quantum
descriptors
locate
its
nucleophilic
electrophilic
centers.
Endothermic
reactions
evident
during
on
as
indicated
positive
values
Δ
Environmental Advances,
Journal Year:
2024,
Volume and Issue:
16, P. 100553 - 100553
Published: May 29, 2024
Characterization
of
industrial
effluent
i.e.
sugar,
dye,
paper
and
pulp;
combined
is
performed
using
the
standard
method,
which
indicates
higher
amount
pollutants
exist
in
all
effluents.
Adsorptive
batch
treatment
conducted
activated
neem
leaf
powder
(a-NLP),
adsorbent
dose,
temperature
contact
duration
are
factors
selected
for
this
study
to
reduction
COD,
BOD
color
from
individual
wastewater.
Maximum
elimination
attained
upto
93.4-82.4,
82.6-75.9
93.4-86.1
%
respectively
paper-pulp
at
dosage
23
gm/L
a-NLP,
300
K
60
min.
Adsorption
isotherms
such
as
Freundlich,
Langmuir,
Dubinin-Raduskevich,
Flory-Huggins
Temkin
Isotherm
examined
order
explore
adsorption
mechanism.
The
reaction
rate
estimated
by
different
kinetic
models
(Pseudo
First-,
Pseudo
Second-order,
Intra-particle
Elovic
equation).
From
correction
coefficient
value,
Freundlich
isotherm
First-order
govern
process.
Different
thermodynamic
parameters
free
energy
(∆G°),
enthalpy
change
(∆H°)
entropy
(∆S°)
also
accessed,
that
thermodynamically
feasible.
Solvent
desorption
carried
out
regenerate
three
consecutive
cycles.
