Heliyon,
Journal Year:
2024,
Volume and Issue:
10(15), P. e34664 - e34664
Published: July 17, 2024
Layered
double
hydroxides
(LDH-D)
and
their
calcined
counterparts,
using
dolomite
as
a
source
of
magnesium,
were
utilized
for
the
immobilization
chromium
(Cr(VI))
in
soil.
The
results
indicate
that
LDH-D,
both
with
without
varying
calcination
temperatures,
can
effectively
immobilize
Cr(VI)
Among
different
temperatures
tested,
LDH-D
subjected
to
at
500
°C
(LDH-D-500)
showed
particularly
high
efficacy.
Long-term
TCLP
experiments
demonstrated
inhibition
soil-to-plant
transmission
Cr(VI),
thereby
highlighting
long-lasting
capacity
its
derivatives.
Furthermore,
analysis
microbial
community's
adaptation
post-remediation
soil
confirmed
durability
bioavailability
LDH-D-500
Cr
immobilization.
Examination
material's
morphology
structure
after
shed
light
on
mechanism
revealed
interlayer
anion
exchange
surface
adsorption
main
factors
responsible
effective
LDH-D-300.
On
other
hand,
LDH-D-900,
dominant
spinel
(MgAl2O4)
structure,
faced
challenges
returning
original
layered
configuration,
making
primary
primarily
relied
memory
effects
LDHs
through
structural
recovery
processes,
facilitated
by
electrostatic
attraction
adsorption.
It
is
also
important
note
CaCO3
plays
an
role
Additionally,
portion
was
converted
Cr(III)
phenomena
such
isomer
substitution
complexation
proficiency
immobilizing
Cr,
ability
instantaneous
separation,
potential
regeneration
make
it
promising
material
remediation
heavy
metal-contaminated
investigations
suggest
use
create
hydrotalcite
calcining
could
render
environmental
inactive,
optimizing
resource
utilization.
Toxics,
Journal Year:
2024,
Volume and Issue:
12(3), P. 168 - 168
Published: Feb. 22, 2024
Chemical
data
compiled
from
field
and
laboratory
studies
were
analysed
on
drinking
water
sources
a
mountain
area
(Gutai
Mountains)
in
Romania.
Six
physico-chemical
indicators,
nine
anions,
twenty-one
metals
determined
analysed.
The
results
of
this
study
showed
that
waters
are
generally
rich
NH4+
NO2−,
exceeding
the
recommended
limit
0.5
mg
NH4+/L,
while
some
As,
Cd,
Mn
Pb,
but
with
concentrations
below
limits
concerning
use
purposes.
applied
heavy
metal
pollution
indices
(scores:
0.56–47.9)
indicate
more
than
50%
samples
characterized
by
medium
degrees.
Based
obtained,
it
was
geological
human
activities
influential
enriching
studied
chemicals
considered.
Emphasizing
aspect
related
to
importance
clean
chemical
status
must
characterize
used
for
purposes,
health
risk
assessment
implemented.
indicated
even
though
metals,
scores
lack
non-carcinogenic
risks
Mn,
Cd
Cu.
Nevertheless,
obtained
significant
at
national
international
levels
offering
perspective
determining
potential
associated
area.
Biochar,
Journal Year:
2024,
Volume and Issue:
6(1)
Published: March 25, 2024
Abstract
Fe-modified
biochar
(FB)
and
co-using
Chinese
milk
vetch
rice
straw
(MR)
are
two
effective
ways
for
mitigating
the
cadmium
(Cd)
contamination
in
paddy
fields
southern
China.
Nevertheless,
effects
of
FB
combined
with
MR
on
Cd
passivation
mechanism
remain
unclear.
In
current
study,
strengthening
induced
by
were
found
mechanisms
extracted
dissolved
organic
matter
(DOM)
from
co-decomposition
alleviation
investigated
through
pot
experiment
adsorption
experiment.
Pot
demonstrated
that
co-incorporating
decreased
available
23.1%
increased
iron
plaque
concentration
11.8%,
resulting
a
34.7%
reduction
concentrations
brown
compared
addition
FB.
Furthermore,
improved
nutrients
soil.
The
molecular
characteristics
DOM
derived
decomposition
(DOM-MR)
analyzed
fluorescence
excitation
emission
matrix
spectroscopy-parallel
factor
analysis
(EEM-PARAFAC)
Fourier
transform-ion
cyclotron
resonance
mass
spectrometry
(FT-ICR
MS).
Results
showed
lignin/carboxylic-rich
alicyclic
molecules
protein/amino
sugar
main
compounds,
potentially
involved
binding.
Adsorption
experiments
revealed
DOM-MR
functional
groups,
specific
surface
area,
negative
charges
FB,
inducing
both
physisorption
chemisorption
Cd(II).
maximum
capacity
after
adding
was
634
mg
g
−1
,
1.30
times
without
DOM-MR.
This
study
suggested
MR,
could
serve
as
an
innovative
practice
simultaneous
remediation
soil
fertilization
Cd-polluted
fields.
It
also
provided
valuable
insights
basis
optimize
performances
enhance
its
potential
immobilization.
Graphical
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: Sept. 3, 2024
Soil
contamination
with
heavy
metals
presents
a
substantial
environmental
peril,
necessitating
the
exploration
of
innovative
remediation
approaches.
This
research
aimed
to
investigate
efficiency
nano-silica
in
stabilizing
calcareous
metal-contaminated
soil.
The
soil
was
treated
five
levels
0,
100,
200,
500,
and
1000
mg/kg
incubated
for
two
months.
results
showed
that
had
specific
surface
area
179.68
$${\text{m}}^{2}/\text{g}$$
.
At
mg/kg,
DTPA-extractable
concentrations
Pb,
Zn,
Cu,
Ni,
Cr
decreased
by
12%,
11%,
11.6%,
10%,
9.5%
compared
controls,
respectively.
Additionally,
as
application
rate
increased,
both
pH
increased.
augmentation
adsorbent
led
decline
exchangeable
(EX)
carbonate-bound
fractions
Cr,
while
distribution
bonded
Fe–Mn
oxides,
organic
matter,
residue
use
resulted
an
8.0%
reduction
EX
4.5%
7.3%
7.1%
7.9%
control
treatment.
Overall,
our
study
highlights
potential
nano
silica
promising
strategy
addressing
metal
pollution
contaminated
soils,
offering
sustainable
solutions
restoration
ecosystem
protection.
