The
reactivity
and
stability
of
zero-valent
iron
(ZVI)
sulfidated
(S-ZVI)
are
inherently
contradictory.
Iron
sulfides
(FeSX)
on
the
S-ZVI
surface
play
multiple
roles,
including
electrostatic
adsorption
catalyzing
reduction.
We
proposed
to
balance
air
by
modulating
FeSX.
Benefiting
from
superior
coordination
accelerate
electron
transport
capabilities
phosphate,
eco-friendly
ammonium
dihydrogen
phosphate
(ADP)
was
employed
synthesis
N,
P,
S-incorporated
ZVI
(NPS-ZVI)
regulate
FeSX
in
this
study.
Raman,
FTIR,
XPS,
DFT
calculations
were
combined
reveal
that
HPO42-
acts
as
main
P
species
Fe
surface.
NPS-ZVI
quantified
different
parameters
(kobs,
kSA,
kM),
which
210.77,
27.44,
211.17-fold
than
ZVI,
respectively.
demonstrated
excellent
pH
tolerance
reusability,
there
no
risk
secondary
pollution.
Critically,
could
effectively
maintain
under
combination
diffusion
limitation
protection
mechanisms
ADP.
attributed
fact
ADP
maintains
accelerates
transport.
This
study
provides
a
novel
strategy
balancing
offers
theoretical
support
for
material
modification.
ACS ES&T Engineering,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 6, 2024
Over
the
past
30
years,
various
methods
have
been
developed
for
enhancing
contaminant
removal
by
zerovalent
iron
(ZVI),
thus
accumulating
a
large
amount
of
quantitative
data
including
reactivity
(kobs)
and
electron
efficiency
(EE).
However,
comparisons
relationships
are
still
lacking,
which
hinders
selection
development
ZVI
enhancement
practical
applications.
In
this
review,
number
kobs
EE
results
systematically
summarized
classified
into
three
types
based
on
mechanisms:
regulating
(hydr)oxide
films
(RIF),
accelerating
corrosion
(AZC),
coupling
reactive
species
with
(CIRs).
Then,
along
their
multiples
(referred
to
as
Rk
REE)
were
conducted
within
context
RIF,
AZC,
CIRs.
This
review
identified
that
in
cases
where
exhibited
low
toward
pollutants,
it
often
possessed
high
pollutant
reduction
vice
versa.
Moreover,
there
existed
correlations
between
lgkobs
(lgRk)
lgEE
(lgREE)
methods.
These
suggest
when
both
(Rk)
(REE)
parameters
known,
other
parameter
can
be
predicted
some
extent.
Finally,
discussed
effects
solution
chemistry
iron-related
compounds
detail
outlined
potential
research
needs
future
studies.
The
reactivity
and
stability
of
zero-valent
iron
(ZVI)
sulfidated
(S-ZVI)
are
inherently
contradictory.
Iron
sulfides
(FeSX)
on
the
S-ZVI
surface
play
multiple
roles,
including
electrostatic
adsorption
catalyzing
reduction.
We
proposed
to
balance
air
by
modulating
FeSX.
Benefiting
from
superior
coordination
accelerate
electron
transport
capabilities
phosphate,
eco-friendly
ammonium
dihydrogen
phosphate
(ADP)
was
employed
synthesis
N,
P,
S-incorporated
ZVI
(NPS-ZVI)
regulate
FeSX
in
this
study.
Raman,
FTIR,
XPS,
DFT
calculations
were
combined
reveal
that
HPO42-
acts
as
main
P
species
Fe
surface.
NPS-ZVI
quantified
different
parameters
(kobs,
kSA,
kM),
which
210.77,
27.44,
211.17-fold
than
ZVI,
respectively.
demonstrated
excellent
pH
tolerance
reusability,
there
no
risk
secondary
pollution.
Critically,
could
effectively
maintain
under
combination
diffusion
limitation
protection
mechanisms
ADP.
attributed
fact
ADP
maintains
accelerates
transport.
This
study
provides
a
novel
strategy
balancing
offers
theoretical
support
for
material
modification.
