Environmental Health Engineering and Management,
Journal Year:
2024,
Volume and Issue:
11(3), P. 273 - 284
Published: June 28, 2024
Background:
Congo
red
(CR),
a
harmful
dye
present
in
water,
requires
effective
removal
methods.
This
study
investigated
the
utilization
of
dry
green
pea
husk
(DGPH)
and
its
charcoal
(CGPH)
as
economical
eco-friendly
adsorbents.
Methods:
Various
factors,
including
contact
time,
pH,
adsorbent
dosage,
initial
concentration,
temperature,
were
to
assess
their
impact
on
adsorption
process.
Also,
different
models
(isotherms,
kinetics,
thermodynamics)
compared
describe
phenomenon.
Results:
Equilibrium
was
achieved
within
30
minutes
for
both
The
optimum
pH
CR
determined
be
2.
capacity
decreased
by
increasing
whereas
it
increased
concentration.
Langmuir
isotherm
model
demonstrated
best
fit
DGPH,
while
Freundlich
exhibited
CGPH.
pseudo-second-order
displayed
superior
To
spontaneity
feasibility
process,
thermodynamic
parameters
enthalpy,
entropy,
Gibbs
free
energy
computed.
results
indicated
that
DGPH
endothermic
favorable
at
lower
temperatures,
CGPH
exothermic
higher
temperatures.
negative
values
confirmed
spontaneous
nature
Conclusion:
establishes
are
environmentally
friendly
alternatives
from
water.
New Journal of Chemistry,
Journal Year:
2024,
Volume and Issue:
48(15), P. 6817 - 6832
Published: Jan. 1, 2024
The
global
textile
industry
poses
significant
challenges
to
public
health,
safety,
and
environmental
sustainability
through
its
discharge
of
wastewater.
Plants,
Journal Year:
2024,
Volume and Issue:
13(6), P. 820 - 820
Published: March 13, 2024
This
research
investigated
the
synthesis
of
biochar
through
direct
pyrolysis
pre-roasted
sunflower
seed
shells
(SFS)
and
peanut
(PNS)
compared
their
application
for
effective
removal
textile
dyes
from
wastewater.
Biochar
prepared
at
900
°C
(SFS900
PNS900)
showed
highest
adsorption
capacity,
which
can
be
attributed
to
presence
higher
nitrogen
content
graphite-like
structures.
CHNS
analysis
revealed
that
PNS900
exhibited
an
11.4%
carbon
than
SFS900,
enhanced
environmental
stability
PNS
biochar.
Fourier-transform
infrared
spectroscopy
(FTIR)
X-ray
diffraction
(XRD)
analyses
produced
indicated
degradation
cellulosic
lignin
moieties.
photoelectron
(XPS)
a
13.8%
22.6%
increase
in
C-C/C=C
mass
concentrations
SFS900
PNS900,
respectively,
could
condensation
polyaromatic
Batch
experiments
dye
demonstrated
irrespective
species,
superior
efficiency
similar
dosages.
In
addition
H-bonding
electrostatic
interactions,
pyridinic-N
graphitic-N
play
vital
role
enhancing
Lewis
acid-base
π-π
EDA
interactions.
The
results
provide
valuable
insights
into
biochar–dye
interaction
mechanisms.
Desalination and Water Treatment,
Journal Year:
2024,
Volume and Issue:
318, P. 100313 - 100313
Published: April 1, 2024
The
complex
process
for
treating
industrial
wastewater
frequently
necessitates
the
employment
of
efficient
treatment
techniques
to
eliminate
harmful
contaminants
before
discharge,
such
as
congo
red
(CR)
dye.
In
this
study,
adsorption
methods
were
utilized
CR
by
employing
hydrogel
bead
composites
derived
from
sodium
alginate
(SA)
and
cetyltrimethylammonium
bromide
(CTAB).
Various
concentrations
CTAB,
including
0.1
wt.%,
1
3
denoted
SC1,
SC2,
SC3
respectively,
examined.
results
demonstrated
that
has
higher
swelling
percentage
lowest
carboxyl
group
(COOH).
Experiments
carried
out
under
different
pH
levels,
concentrations,
durations
removal
CR.
maximum
capabilities
obtained
141.08
mg/g,
144.50
mg/g
153.24
SC2
SC3,
respectively.
Freundlich
pseudo-second-order
models
demonstrate
best
fit
both
isotherm
kinetic
analysis
across
all
samples,
suggesting
a
multilayer
chemisorption
mechanism.
Reusability
studies
revealed
strong
performance,
underscoring
beads'
potent
capability
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: April 2, 2024
Abstract
Nano
round
polycrystalline
adsorbent
(NRPA)
of
chicken
bones
origin
was
utilize
as
effective
in
Congo
red
dye
removal
via
aqueous
media.
The
NRPA
prepared
thermal
decomposition
and
its
structure
investigated
with
the
aids
Transmission
Electron
Microscopy,
Fourier
Infrared
Spectroscopy
(FT-IR),
Scanning
Energy
Dispersive
X-ray
Analysis
(EDX),
Diffractometer
(XRD).
A
monophasic
apatite
phase
confirmed
from
XRD
investigation,
while
functional
groups
analysis
showed
that
possessed
CO
3
2−
,
PO
4
3−
OH
−
absorption
bands.
maximum
adsorption
capacities
derived
Langmuir
isotherm
is
98.216
mg
g
−1
.
From
combined
values
n
Freundlich
separation
factor
(R
L
)
models,
CR
by
favourable.
Thermodynamic
5.280
kJ
mol
16.403
K
were
found
for
ΔH°
ΔS°
respectively.
entire
ΔG°
which
ranges
35.248
to
459.68
all
negative
at
different
temperatures.
Thus,
nano
bone
can
serve
excellent
waste
water.
Adsorption,
Journal Year:
2024,
Volume and Issue:
30(6), P. 685 - 698
Published: April 7, 2024
Abstract
Organic
azo-dyes,
including
Congo
Red,
present
a
significant
environmental
concern
due
to
their
widespread
industrial
usage
and
resistance
biodegradation,
leading
severe
contamination
of
effluents.
This
study
explores
the
efficacy
two
basic
perovskites
(MSnO
3
,
where
M
=
Ca
Sr)
in
removing
Red
by
adsorption,
offering
potential
solution
for
wastewater
treatment.
The
synthesis
adsorbents
was
performed
coprecipitation
technique,
an
effective
no-waste
producing
method.
By
adjusting
reaction
conditions,
physical-chemical
characteristics
perovskites,
crystallinity,
morphological
features,
surface
area
porosity,
were
controlled.
Adsorption
studies
conducted
across
range
concentrations
(10–100
mg
L
−
1
)
at
pH
10
revealed
MSnO
possess
exceptional
adsorption
capacity
exceeding
100
per
gram.
results
indicate
irreversible
adsorbent
regeneration
thermal
Slow
kinetics
also
suggest
strong
binding
forces
aligned
with
fundamentals
pseudo-second-order
kinetic
model.
Regarding
impact
parameters,
while
precipitation
conditions
may
not
significantly
influence
performance,
perovskite
samples
synthesized
higher
temperatures
are
considered
more
suitable
this
application
enhanced
stability
regenerative
capabilities
repeated
use.
Estimated
correlations
between
sample
parameters
efficiency
provide
valuable
insight
practical
oxide
addressing
dye
issues.
