Frontiers in Environmental Science,
Год журнала:
2020,
Номер
8
Опубликована: Окт. 21, 2020
Recent
research
suggests
that
biochar
amendment
is
a
promising
approach
to
mitigate
soil
contamination
via
immobilizing
heavy
metals
and
organic
pollutants.
Through
intensive
literature
review,
this
paper
was
aimed
better
understand
the
processes,
mechanisms,
effectiveness
of
chemical
contaminants
in
soil.
The
quality
characteristics
as
varied
greatly
with
feedstock
materials
pyrolysis
conditions.
Biochar
products
from
different
sources
demonstrated
remarkably
diversified
capacities
efficiencies
for
stabilizing
contaminants.
Soil-incorporated
able
stabilize
Cd,
Cu,
Ni,
Pb,
Zn
reduce
their
bioavailability
through
enhanced
sorption
(based
on
electrostatic
attraction,
ion
exchange,
surface
complexation)
precipitation
(incurred
pH
elevation
ash
addition
carbonates
phosphates).
stabilization
efficacy
largely
determined
by
cation
exchange
capacity
(CEC),
pH,
content
biochar.
increased
mobility
anionic
toxic
elements
(e.g.,
CrO42-,
AsO3-,
Sb(OH)6-)
also
adsorb
nonpolar
compounds
(through
pore-filling,
partition,
hydrophobic
effect)
polar
(via
H-bonding,
specific
interaction,
precipitation).
adsorption
efficiency
controlled
properties
area
(SSA),
microporosity,
hydrophobicity.
may
facilitate
mineralization
pollutants
enhancing
microbial
activities.
biochar-facilitated
remediation
case-specific,
changing
source,
rate,
placement,
type,
pollutant
species.
More
field
studies
are
needed
evaluate
long-term
under
practical
circumstances.
