Uranium-stressed
soil
caused
by
nuclear
industry
development
and
energy
acquisition
have
attracted
extensive
attentions
for
a
long
time.
This
study
investigated
the
effects
of
biochar
application
with
different
pyrolysis
temperatures
on
remediation
uranium-stressed
soil.
The
results
showed
that
higher
temperature
(700℃)
was
benefit
ryegrass
growing
lower
uranium
accumulation
in
plants.
At
same
time,
immobilization
more
effective
at
temperature.
Careful
investigations
indicated
activities
urease
sucrase
were
promoted,
bacterial
diversity
strengthened
C700
group,
which
may
contribute
to
immobilization.
could
activate
metabolic
lipids
amino
acids,
organic
acids
derivatives,
oxygen
compounds.
Nicotinate
nicotinamide
metabolism,
Benzoxazinoid
biosynthesis
unique
pathways
enhance
tolerance
from
perspectives.
Based
these
results,
we
recommend
use
700°C
when
processing
will
facilitate
implementation
screening
provide
theoretical
helps
Journal of Hazardous Materials,
Год журнала:
2024,
Номер
466, С. 133486 - 133486
Опубликована: Янв. 17, 2024
Biochar
is
an
eco-friendly
amendment
for
the
remediation
of
soils
contaminated
with
cadmium
(Cd).
However,
little
attention
has
been
paid
to
influence
and
underlying
mechanisms
co-pyrolyzed
biochar
on
bioavailability
uptake
Cd
in
paddy
soils.
The
current
study
explored
effects
from
peanut
shells
(P)
maize
straw
(M)
at
different
mixing
ratios
(1:0,
1:1,
1:2,
1:3,
0:1,
2:1
3:1,
w/w),
bacterial
community
fractionation
soil,
its
by
rice
plant.
addition,
particularly
P1M3
(P/M
1:3),
significantly
elevated
soil
pH
cation
exchange
capacity,
transferred
mobile
residual
fraction,
reduced
availability
rhizosphere
soil.
application
decreased
concentration
tissues
(root,
stem,
leaf,
grain)
30.0%-
49.4%,
compared
control.
Also,
enhanced
microbial
diversity
indices
relative
abundance
iron-oxidizing
bacteria
Moreover,
was
more
effective
promoting
formation
iron
plaque,
increasing
sequestration
plaque
than
other
treatments.
Consequently,
highest
yield
lowest
accumulation
were
observed
following
application.
This
revealed
feasibility
applying
facilitating
Cd.
Abstract
Biochar-based
sulfidized
nano-sized
zero-valent
iron
(SNZVI/BC)
can
effectively
immobilize
cadmium
(Cd)
in
contaminated
paddy
soils.
However,
the
synergistic
effects
between
biochar
and
SNZVI
on
Cd
immobilization,
as
well
underlying
mechanisms
remain
unclear.
Herein,
a
soil
microcosm
incubation
experiment
was
performed
to
investigate
immobilization
performance
of
SNZVI/BC
towards
soil.
Results
indicated
that
addition
at
dosage
3%
significantly
lessened
concentration
available
from
14.9
(without
addition)
9.9
mg
kg
−1
with
an
efficiency
33.3%,
indicating
effect.
The
sequential
extraction
results
proportion
residual
increased
8.1
10.3%,
manifesting
transformation
unstable
fractions
steadier
specie
after
application
SNZVI/BC.
Also,
pH,
organic
matter,
dissolved
carbon,
which
altered
bacterial
community
soil,
enriching
relative
abundances
functional
microbes
(e.g.,
Bacillus
,
Clostridium
Desulfosporosinus
).
These
microorganisms
further
facilitated
generation
ammonium,
nitrate,
ferrous
enhancing
nutrients’
availability.
direct
interaction
2+
physicochemical
properties,
responded
played
important
roles
Overall,
biochar-based
is
promising
candidate
for
effective
improvement
availability
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