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.
Sustainability,
Год журнала:
2023,
Номер
15(12), С. 9534 - 9534
Опубликована: Июнь 14, 2023
Heavy
metal
ion
pollution
poses
severe
health
risks.
In
this
study,
a
kappa-carrageenan/cellulose
(κ-CG/CL)
hydrogel
was
prepared
using
facile
one-step
method
to
remove
Pb2+
ions
from
aqueous
solutions.
The
functional
groups
and
crystallinity
nature
of
κ-CG/CL
have
been
identified
via
Fourier-transform
infrared
spectroscopy
(FTIR)
X-ray
diffraction
(XRD).
contrast,
the
porous
morphology
size
distribution
on
surface
with
pore
1–10
μm
were
scanning
electron
microscope
(SEM)
Brunauer–Emmett–Teller
(BET)
area
analysis.
as-prepared
effectively
removed
ions,
primary
environmental
pollutants.
effects
pH
contact
time
adsorption
studied
along
isotherms
kinetics
onto
hydrogels
Notably,
solutions
treated
ions.
results
fit
well
pseudo-first-
second-order
kinetic,
Elovich,
intra-particle
diffusion,
Langmuir
Freundlich
isotherm
models.
Based
fitting
results,
maximum
capacity
obtained
model
found
be
486
±
28.5
mg/g
(79%).
Reusability
studies
revealed
that
could
more
than
79%
removal
efficiency
after
eight
adsorption–desorption
cycles.
addition,
its
mechanism
for
efficiently
adsorbing
analyzed.
These
findings
imply
has
substantial
potential
application
in
removing
recycling
heavy
Scientific Reports,
Год журнала:
2024,
Номер
14(1)
Опубликована: Июнь 24, 2024
Abstract
Worldwide
industrialization
has
grown
at
a
rapid
pace,
contaminating
water
resources,
particularly
with
phenolic
pollutants
that
pose
risk
to
aquatic
systems
and
human
health.
The
goal
of
this
study
is
create
an
inexpensive
magnetic
composite
can
effectively
remove
nitrophenol
(o-NP)
using
adsorptive
means.
In
instance,
nonanyl
chitosan
(N-Cs)
derivative
was
synthesized
then
combined
activated
petroleum
coke
(AP-coke)
Fe
3
O
4
boost
its
adsorbability
towards
o-NP
facilitate
separation.
Fourier
transform
infrared
spectroscopy
(FTIR),
scanning
electron
microscopy
(SEM),
X-ray
diffractometer
(XRD),
Vibrating
sample
magnetometer
(VSM),
photoelectron
(XPS),
zeta
potential
were
employed
characterize
the
composite.
experimental
results
indicated
/AP-coke/N-Cs
possesses
greater
affinity
toward
maximal
efficiency
reached
88%
compared
22.8,
31.2,
45.8%
for
,
AP-coke
N-Cs,
respectively.
equilibrium
adsorption
data
coincided
Langmuir,
Freundlich,
Temkin
isotherm
models,
maximum
capacity
291.55
mg/g
pH
6,
whereas
pseudo
second
order
kinetic
model
offered
best
fit
data.
Besides,
developed
adsorbent
preserved
satisfactory
characteristics
after
reuse
five
successive
cycles.
proposed
mechanism
involves
H-bonding,
π-π
interaction,
hydrophobic
interactions
donor-acceptor
interactions.
These
findings
hypothesize
constructed
could
efficiently
nitrophenols
from
polluted
high
performance
ease-separation.
Gels,
Год журнала:
2024,
Номер
10(9), С. 546 - 546
Опубликована: Авг. 23, 2024
Polysaccharides
have
recently
attracted
growing
attention
as
adsorbents
for
various
pollutants,
since
they
can
be
extracted
from
a
variety
of
renewable
sources
at
low
cost.
An
interesting
hydrophilic
and
biodegradable
polysaccharide
is
dextran
(Dx),
which
well-known
its
applications
in
the
food
industry
medicine.
To
extend
application
range
this
biopolymer,
study,
we
investigated
removal
crystal
violet
(CV)
methylene
blue
(MB)
dyes
an
aqueous
solution
by
Dx-based
cryogels
using
batch
technique.
The
cryogel
adsorbents,
consisting
cross-linked
Dx
embedding
polyphenolic
(PF)
extract
spruce
bark,
were
prepared
freeze-thawing
approach.
It
was
shown
that
incorporation
PF
into
matrix
induced
decrease
porosity,
pore
sizes
swelling
ratio
values.
Moreover,
average
DxPF
loaded
with
further
decreased
42.30
±
7.96
μm
to
23.68
2.69
μm,
indicating
strong
interaction
between
functional
groups
those
dye
molecules.
sorption
performances
evaluated
comparison
extract.
experimental
capacities
higher
cryogels,
particularly
highest
contents
(sample
DxPF2),
demonstrated
1.2779
0.0703
mmol·g−1,
CV,
0.3238
0.0121
MB.
mechanisms
analyzed
mathematical
models,
including
Langmuir,
Freundlich,
Sips
Dubinin–Radushkevich
isotherms,
kinetic
like
pseudo-first-order
(PFO),
pseudo-second-order
(PSO),
Elovich
intra-particle
diffusion
(IPD).
process
best
described
isotherm
PSO
chemisorption
dominant
mechanism.
This
study
outlines
importance
developing
advanced
materials
environmental
applications.
International Journal of Biological Macromolecules,
Год журнала:
2024,
Номер
283, С. 137555 - 137555
Опубликована: Ноя. 12, 2024
Polysaccharide-based
biopolymeric
magnetic
hydrogels
have
garnered
significant
attention
as
effective
materials
for
wastewater
treatment
due
to
their
high
adsorption
capacity
and
environmentally
friendly
nature.
This
review
examines
recent
advancements
in
the
development
of
derived
from
polysaccharides
such
cellulose,
chitosan,
alginate,
carrageenan,
starch,
gums,
with
a
focus
on
application
removing
antibiotics
contaminated
water
it
not
only
enhances
performance
but
also
simplifies
separation
processes
after
treatment,
making
them
highly
efficient
practical
applications.
The
aims
provide
comprehensive
overview
synthesis
techniques,
characteristics,
interaction
mechanisms
these
hydrogels,
highlighting
renewability
suitability
large-scale
treatment.
Despite
promise,
there
is
lack
in-depth
analysis
fabrication
methods.
addresses
this
gap
by
evaluating
various
methods
assessing
hydrogels'
efficiency
adsorbing
antibiotic
pollutants.
Key
findings
reveal
that
components
contribute
materials'
enhanced
binding,
better
removal
capabilities,
easy
recoverability.
between
are
explored,
demonstrating
superior
potential.
Future
challenges
research
directions
discussed,
an
emphasis
improving
scalability
applications
hydrogels.
Overall,
offers
valuable
insights
into
potential
towards
purification.
