Agronomy,
Год журнала:
2024,
Номер
14(9), С. 2072 - 2072
Опубликована: Сен. 10, 2024
In
recent
years,
the
remediation
of
heavy
metal-contaminated
soils
has
attracted
great
attention
worldwide.
Previous
research
on
removal
toxic
metals
from
wastewater
effluents
through
adsorption
by
typical
solid
wastes
(e.g.,
fly
ash
and
coal
gangue)
mainly
focused
control
pollutants.
this
study,
a
gangue
(CG)
by-product
Hancheng
City
was
used
as
raw
material
to
prepare
polymeric
aluminum
chloride-loaded
gangue-based
porous
carbon
(PAC-CGPC)
hydrothermal
synthesis.
This
subsequently
employed
assess
its
performance
in
mitigating
Pb2+
soils.
addition,
effects
pore
structure
prepared
rates,
mechanisms,
plant
root
uptakes
soil
were
investigated
study.
The
CG
PAC-CGPC
materials
exhibited
specific
surface
areas
1.8997
152.7892
m2/g,
respectively.
results
kinetics
isotherms
indicate
that
based
follows
pseudo-second-order
kinetic
model,
suggesting
chemisorption
may
be
dominant
process.
isotherm
showed
Freundlich
model
explained
better
process
Pb2+,
suggests
sites
lead
ions
APC-CGPC
are
not
uniformly
distributed
tend
enriched
APC,
also
shows
ion
exchange
between
ions.
thermodynamic
fitting
demonstrated
occurrence
spontaneous
exothermic
PAC-CGPC-based
involving
complexation.
addition
soybean
plants
further
explored
pot
experiments.
revealed
substantial
decreases
contents
organs
(roots,
stems,
leaves)
following
at
dose
3%
compared
with
groups.
Furthermore,
effectively
reduced
bioavailable
content
82.11
enhanced
growth
15.3%.
These
findings
inhibition
effect
translocation
seedlings.
modified
adsorbent
highly
good
hydrophilicity,
making
it
prone
migration
unsaturated
and,
consequently,
enhancing
immobilization.
provides
theoretical
support
for
development
CG-based
capable
immobilizing
Sustainability,
Год журнала:
2024,
Номер
16(2), С. 687 - 687
Опубликована: Янв. 12, 2024
The
concurrent
presence
of
arsenic
(As)
and
cadmium
(Cd)
contamination
in
soil
is
widespread
severe,
highlighting
the
need
for
remediation.
However,
remediating
As
Cd
co-contaminated
soils
more
complex
than
contaminated
with
a
single
heavy
metal
due
to
opposite
properties
soil.
Thus,
different
forms
their
transformation
rules
have
been
systematically
reviewed
this
paper.
Simultaneously,
hyperaccumulators
immobilization
amendments
used
remediation
As–Cd
were
reviewed.
Moreover,
mechanisms
phytoremediation
chemical
techniques
treatment
effects
expounded
detail.
To
promote
development
ecological
civilization,
paper
proposes
further
strategies
guidance
Polymers,
Год журнала:
2024,
Номер
16(8), С. 1096 - 1096
Опубликована: Апрель 15, 2024
Coal
gangue
is
a
byproduct
of
coal
mining
and
processing,
according
to
incomplete
statistics,
China
has
amassed
substantial
stockpile
exceeding
2600
large
mountains,
which
poses
serious
threat
the
ecological
environment.
Utilizing
as
coarse
aggregate
produce
concrete
(GC)
presents
promising
avenue
for
addressing
disposal
gangue;
however,
several
challenges
that
need
be
tackled,
such
low
strength
poor
resistance
repeated
loads.
In
this
study,
polypropylene
fibers
(PPFs)
were
incorporated
into
enhance
its
utilization
rate.
Uniaxial
compressive
loading
experiments
then
conducted
investigate
uniaxial
fatigue
properties
fiber-reinforced
(PGC)
with
varying
substitution
rates
(20%,
40%,
60%)
different
fiber
admixtures
(0,
0.1%,
0.2%,
0.3%).
The
findings
indicate
incorporating
at
rate
40%
could
notably
PGC,
resulting
in
maximum
increase
19.4%.
experiments,
ductility
PGC
was
enhanced
incorporation
PPFs,
reduction
33.76%
damage
factor
19.42%
residual
strain
PGC-40-0.2
compared
PGC-40-0.
A
PPF
content
0.2%
found
optimal
enhancing
performance
PGC.
Scanning
electron
microscope
(SEM)
testing
proved
improvement
effect
on
from
microscopic
perspective.
This
study
provides
crucial
experimental
data
theoretical
foundation
complex
stress
environments.
Frontiers in Microbiology,
Год журнала:
2025,
Номер
16
Опубликована: Апрель 11, 2025
Silicon-iron-modified
biochars
(SMBCs)
were
produced
to
remediate
paddy
soil
contaminated
with
both
cadmium
(Cd)
and
arsenic
(As).
This
study
explored
the
effects
of
SMBCs
on
transformation
Cd
As
species
in
associated
responses
functional
genes
elucidate
remediation
mechanisms.
Three
silicon-iron
modified
utilized.
(i)
Silicon
dioxide
magnetic
biochar
(SMBC1),
(ii)
Calcium
silicate
(SMBC2),
(iii)
Sodium
(SMBC3)
applied
soil.
increased
pH
concentration
dissolved
organic
carbon
(DOC)
by
0.42-0.54
units
6.6-16.39%,
respectively.
SMBC
treatments
reduced
bioavailable
concentrations
29.09-73.63%
1.67-8.37%,
respectively,
transforming
As(III)
into
less
toxic
As(V)
stabilizing
soluble
a
more
inert
residual
form.
Compared
control,
significantly
2.94-16.17%
(p
<
0.05)
11.42-26.07%
0.05).
Adding
calcium
(CaSiO3)
at
mass
ratio
5%
resulted
0.79
mg·kg-1
(an
increase
16.86%)
an
37.89
mg·kg-1.
enhanced
porosity,
microbial
aioA
genes,
sulfate-reducing
bacteria,
facilitating
oxidation
As(III).
Magnetic
amended
(SMBC2)
demonstrated
superior
efficacy
addressing
co-contamination
As.
The
mechanisms
include
following:
decrease
(DOC),
gene
activity,
promoting
As(V),
dissimilatory
sulfite
reductase
beta
subunit
(DsrB)
reduction
sulfate
ion
(SO4
2-)
sulfide
(S2-),
leading
formation
(CdS)
precipitates
additional
precipitation
involving
Fe.
These
results
highlight
potential
silicate-modified
as
effective
additive
for
co-contaminated
soils,
providing
insights
heavy
metals'
stabilization
