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.
Desalination and Water Treatment,
Journal Year:
2024,
Volume and Issue:
319, P. 100523 - 100523
Published: June 12, 2024
Heavy
metals
represent
a
significant
contributor
to
water
pollution,
posing
serious
environmental
and
health
risks
due
human
activities
industrialization.
The
release
of
heavy
metal
contaminants
into
sources
has
spurred
extensive
research
wastewater
treatment
methods,
including
precipitation,
evaporation,
ion
exchange,
membrane
processes,
electroplating.
However,
these
conventional
techniques
often
prove
costly,
limited
in
effectiveness,
may
inadvertently
exacerbate
pollution
concerns.
This
review
underscores
biosorption
as
highly
promising
alternative
for
effectively
removing
harmful
ions
from
sources.
Biosorption,
physical
technique,
capitalizes
on
mechanisms
such
surface
complexation,
leveraging
more
economical
biological
materials
biosorbents.
Microorganisms,
encompassing
bacteria,
fungi,
algae,
plant
products,
emerge
pivotal
agents
biosorption,
offering
sustainable
cost-effective
approach.
There
is
growing
interest
harnessing
local
microbiota
aiming
mitigate
contamination
without
adverse
impacts.
Notably,
both
living
deceased
fungal
biomass
have
garnered
attention
adsorbents
eliminating
solutions.
behavior
presents
numerous
advantages,
warranting
further
fully
exploit
its
potential
endeavors.
Polymers,
Journal Year:
2025,
Volume and Issue:
17(4), P. 502 - 502
Published: Feb. 14, 2025
Among
the
naturally
occurring
polysaccharides,
chitosan
is
second-most
abundant
polysaccharide.
It
obtained
from
chitin
through
a
process
known
as
deacetylation.
biodegradable,
biocompatible,
and
non-toxic,
which
made
it
suitable
for
various
environmental
applications.
In
present
review,
structure,
properties,
characteristics
of
were
discussed.
addition,
modified
forms
(including
cross-linked,
nanoparticles,
functionalized,
grafted
chitosan)
enumerated.
The
applications
these
in
adsorption
organic
pollutants
(such
antibiotics,
dyes,
pesticides,
microplastics,
polyaromatic
hydrocarbons,
parabens,
polychlorobiphenyls)
are
comprehensively
reviewed.
Furthermore,
mechanism
adsorption,
isotherm
(Langmuir
Freundlich),
kinetic
models
highlighted.
Finally,
economic
viability
assessment
impact
processing
tons
shrimp
shells
into
annually
Desalination and Water Treatment,
Journal Year:
2024,
Volume and Issue:
319, P. 100449 - 100449
Published: May 31, 2024
The
efficient
removal
of
Cr(VI)
from
the
contaminated
wastewater
is
an
essential
issue
before
discharge
in
a
watercourse.
Adsorption
viewed
as
most
promising
technology
for
because
its
distinct
advantages,
including
low
operating
cost,
ease
operation,
design
simplicity,
maintenance,
and
high
efficiency.
Chitosan
natural
biopolymer
with
amine
(-NH2)
hydroxyl
(-OH)
groups
structure.
non-toxic,
biodegradable,
biocompatible,
hydrophilic,
anti-bacterial
nature
chitosan
nanoparticles
makes
it
ideal
bio-sorbent
heavy
metal
ions
wastewater.
Weak
mechanical
strength,
separation
difficulties
aqueous
phase,
recyclability,
reusability
are
potential
limitations
utilizing
particles
adsorbent
There
increasing
attention
fabricating
magnetic
(M-Ch-NPs)
surface
modification
using
magnetite
to
enhance
reusablity
minimize
phase.
present
study
reviews
various
fabrication
methods
utilization,
environmental
impacts,
challenges
M-Ch-NPs
Polymers,
Journal Year:
2025,
Volume and Issue:
17(3), P. 291 - 291
Published: Jan. 23, 2025
Chitosan-based
biosorbents
are
particularly
valuable
in
environmental
applications,
such
as
wastewater
treatment
for
contaminant
removal.
However,
several
challenges
remain
optimizing
their
production
and
performance
related
to
improving
adsorption
efficiency,
stability,
scalability,
cost,
sustainable
sourcing
large-scale
applications.
The
removal
of
Methylene
Blue
(MB)
Orange
16
(O16)
from
aqueous
solutions
was
studied
using
a
biosorbent
derived
the
waste
biomass
brewing
industry,
specifically
Saccharomyces
pastorianus
immobilized
into
chitosan.
(obtained
by
straightforward
entrapment
technique)
characterized
Scanning
Electron
Microscopy
(SEM)
Energy
Dispersive
X-ray
Analysis
(EDAX)
evaluate
its
structural
properties.
biosorption
behavior
toward
organic
contaminants,
cationic
an
anionic
dye,
investigated.
Key
operational
factors
that
influenced
biosorbent’s
efficiency
were
examined,
including
initial
dye
concentration,
type,
pH
solution,
amount
used.
These
evaluated
during
stage
studies
assess
impact
on
overall
effectiveness
removing
dyes
solutions.
Using
this
eco-friendly
biosorbent,
capacities
obtained
Langmuir
isotherm
model
212.77
mg/g
case
MB
285.71
O16
mg/g,
results
confirmed
process
is
based
physical
mechanism
suggested
energy
values
process,
E,
DR
model:
6.09
kJ/mol
(MB
dye)
7.07
(O16
suggest
electrostatic
interaction
bonds.
indicate
residual
pastorianus,
byproduct
biotechnological
can
be
exploited
immobilization
matrix
(chitosan)
retention
polluting
species
environment
present
moderate
concentrations.
ChemistrySelect,
Journal Year:
2024,
Volume and Issue:
9(41)
Published: Oct. 28, 2024
Abstract
In
recent
years,
various
industrial
and
agricultural
problems
have
been
highlighted,
the
pollution
of
heavy
metal
ions
to
water
bodies
has
become
a
considerable
serious
phenomenon.
Adsorption
method
is
an
efficient,
low‐cost,
easy
implement
for
removing
ions,
which
does
not
produce
secondary
pollution,
widely
used
in
treatment.
Polysaccharides
are
natural
polymers,
their
hydroxyl,
carboxyl,
amine
groups
provide
feasibility
synthesis
hydrogels
with
structures.
The
synthesized
polysaccharide
hydrogel
characteristics
high
adsorption
capacity,
specific
adsorption,
nontoxic,
so
on.
this
review,
kinds
different
methods
were
discussed
first.
Then,
mechanism
modes
reviewed.
Finally,
effects
environmental
factors
on
capacity
studied.
future
research
by
was
proposed.
