The
quality
of
soil
containing
heavy
metals
(HMs)
around
nonferrous
metal
mining
areas
is
often
not
favorable
for
plant
growth.
Three
types
growth
promoting
rhizobacteria
(PGPR)-assisted
ryegrass
were
examined
here
to
treat
Cd,
Pb,
and
Zn
contaminated
collected
from
a
smelting
facility.
effects
PGPR-assisted
plants
on
quality,
growth,
the
migration
transformation
HMs
evaluated.
Results
showed
that
inter-root
inoculation
PGPR
increased
redox
potential,
urease,
sucrase
acid
phosphatase
activities,
microbial
calorimetry,
bioavailable
P,
Si,
K
content.
Inoculation
with
also
aboveground
parts
root
length,
contents,
antioxidant
enzyme
activities.
most
significant
effect
was
simultaneous
all
three
PGPRs
extraction
(%)
Cd
(59.04-79.02),
Pb
(105.56-157.13),
(27.71-40.79),
compared
CK
control
(without
fungi).
Correspondingly,
contents
total
(39.94-57.52),
(37.59-42.17),
(34.05-37.28)
decreased
CK1
fungi
plants),
whereas
their
bioavailability
increased.
suggest
can
improve
in
areas,
promote
transform
fraction
soil,
increase
by
ryegrass.
promising
microbe-assisted
phytoremediation
strategy
re-greening
vegetation
area
while
remediating
pollution.
Environment International,
Journal Year:
2024,
Volume and Issue:
185, P. 108498 - 108498
Published: Feb. 13, 2024
Biochar
is
a
very
promising
material
for
soil
remediation.
However,
most
studies
mainly
focus
on
the
adsorption
ability
of
biochar
one
heavy
metal,
which
difficult
to
evaluate
actual
remediation
effect
since
soils
were
contaminated
with
multiple
metals.
In
order
improve
efficiency,
we
used
joint
method
magnetically
modified
and
ryegrass
remediate
polluted
by
compound
metals
(chromium,
nickel,
copper,
zinc,
arsenic
cadmium),
process
organic
carbon
mineralization
in
soils.
It
was
found
that
magnetic
together
decreased
concentrations
Cr,
Ni,
Cu,
Zn,
As,
Cd
24.12
%,
23.30
22.01
9.98
14.83
15.08
respectively,
reduced
available
fractions.
Ryegrass
roots
main
accumulation
part
metals,
enrichment
ranked
as
Zn
>
As
Cr
Cu
Ni
Cd.
addition,
can
maintained
stability
pool,
inhibited
emission
volatile
compounds
from
ryegrass.
Overall,
this
study
indicates
spheres
combined
an
effective
co-contaminated
soils,
has
excellent
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: April 1, 2024
Abstract
Heavy
metal
contamination
is
an
urgent
ecological
governance
problem
in
mining
areas.
In
order
to
seek
for
a
green
and
environmentally
friendly
reagent
with
better
plant
restoration
effect
solve
the
of
low
efficiency
heavy
pollution
soil.
this
study,
we
evaluated
effects
three
biodegradable
chelating
agents,
namely
citric
acid
(CA),
fulvic
(FA)
polyaspartic
(PASP),
on
physicochemical
properties
copper
tailings,
growth
ryegrass
(
Lolium
perenne
L.)
accumulation
therein.
The
results
showed
that
agent
application
improved
increased
biomass
enriched
more
Cu
Cd
tailings.
control
group,
main
existing
forms
were
oxidizable
state,
followed
by
residual,
weak
soluble
reducible
states.
After
CA,
FA
or
PASP
application,
converted
from
residual
states
states,
whose
bioavailability
tailings
thus
enhanced.
Besides,
incorporation
extraction
efficiencies
as
manifested
root
stem
contents
30.29–103.42%,
11.43–74.29%,
2.98–110.98%
11.11–111.11%,
respectively,
comparison
group.
presence
multiple
metals,
selectivity
regarding
metals
PCA
analysis
revealed
CA-4
PASP-7
treatment
had
great
remediation
potentials
against
increases
90.98%
74.29%
compared
CK
ACS Sustainable Chemistry & Engineering,
Journal Year:
2024,
Volume and Issue:
12(11), P. 4767 - 4778
Published: March 7, 2024
The
application
of
nanotechnology
in
phytoremediation
heavy-metal-polluted
soil
has
revitalized
this
traditional
remediation
technology
with
higher
efficiencies.
Among
various
material
types,
micronutrient-based
nanomaterials
have
recently
come
into
the
public
spotlight
because
their
positive
effects
on
plant
performances
without
significant
perturbation
to
environmental
media,
while
and
related
mechanisms
enhance
efficiencies
remain
largely
uncovered.
In
study,
molybdenum
trioxide
nanoparticles
(MoO3
NPs)
molybdate
(Mo6+)
were
applied
combined
heavy-metal-contaminated
soils
explore
tolerance
phytoextraction
ability
a
typical
Cd
hyperaccumulator,
Solanum
nigrum
L.
Experimental
results
indicated
that
low-level
Mo
(4
mg
kg–1)
application,
especially
for
MoO3
NPs,
significantly
improved
performance
accumulation
S.
by
activating
nutrient
assimilation
antioxidative
levels,
excessive
addition
(20
40
further
exacerbated
detrimental
plants
under
heavy-metal
pressure.
Furthermore,
nontargeted
metabolomic
analysis
was
adopted
uncover
regulating
materials
responses.
Under
4
kg–1
treatment,
NPs
stimulated
metabolite
expression
carbohydrate
biosynthesis
systems
ability,
revealing
less
metabolic
compared
Mo6+
treatment.
Abscisic
acid
signaling
considered
be
key
regulator
contributing
differential
pathways
between
treatments.
However,
both
led
similar
dysregulations
several
important
concerning
amino
acid,
lipid,
metabolisms.
This
study
provided
theoretical
basis
utilizing
essential
facilitate
hyperaccumulators
during
situ
heavy
metals.
