Materials,
Journal Year:
2022,
Volume and Issue:
15(20), P. 7112 - 7112
Published: Oct. 13, 2022
In
this
study,
the
effects
of
catalysis
heavy
metals
on
pyrolysis
waste
polyester
textiles
(WPTs)
and
adsorption
behaviors
products
WPTs
for
Cr(VI)
were
explored.
TG−DTG
analysis
indicated
that
metal
ions
catalyzed
process
by
reducing
temperature
decomposition
WPTs.
The
surface
morphology
pore
structure
carbons
analyzed
using
SEM
BET.
results
demonstrated
Zn−AC
possessed
largest
specific
area
847.87
m2/g.
abundant
acidic
functional
groups
activated
proved
to
be
involved
in
via
FTIR
analysis.
experiments
was
more
favorable
at
low
pH
conditions,
maximum
capacities
Zn−AC,
Fe−AC,
Cu−AC
199.07,
136.25,
84.47
mg/g,
respectively.
XPS
analyses
after
adsorption,
combined
with
kinetics
isotherm
simulations,
mechanism
includes
filling,
an
electrostatic
effect,
a
reduction
reaction,
complexation.
This
study
showed
salts
catalyze
processes
WPTs,
derived
from
are
promising
adsorbents
removal.
SOIL,
Journal Year:
2025,
Volume and Issue:
11(1), P. 323 - 338
Published: April 28, 2025
Abstract.
The
microbial
fuel
cell
(MFC)
is
an
efficient
in
situ
approach
to
combat
pollutants
and
generate
electricity.
This
study
constructed
a
soil
MFC
(SMFC)
reduce
Cr(VI)
paddy
investigate
its
influence
on
community
resistance
characteristics.
Ferroferric
oxide
(Fe3O4)
nanoparticles,
as
the
cathodic
catalyst,
effectively
boosted
power
generation
(0.97
V,
102.00
mW
m−2),
with
porous
structure
reducibility
also
contributing
chromium
(Cr)
reduction
immobilization.
After
30
d,
93.67
%
of
was
eliminated.
bioavailable
Cr
decreased
by
97.44
%,
while
residual
form
increased
88.89
%.
SMFC
operations
greatly
changed
enzymatic
activity
structure,
exoelectrogens
like
Desulfotomaculum
(3.32
anode)
Cr(VI)-reducing
bacteria
Hydrogenophaga
(2.07
cathode)
more
than
1000
folds
soil.
In
particular,
significantly
enhanced
heavy-metal
gene
(HRG)
abundance.
Among
them,
chrA,
chrB,
chrR
99.54
%–3314.34
anodes,
probably
attributable
enrichment
potential
tolerators
Acinetobacter,
Limnohabitans,
Desulfotomaculum.
These
key
taxa
were
positively
correlated
HRGs
but
negatively
pH,
electrical
conductivity
(EC),
Cr(VI),
which
could
have
driven
reduction.
provided
novel
evidence
for
bio-electrochemical
system
applications
contaminated
soil,
be
environmental
remediation
detoxification.
Chromium
(Cr)
transformation
in
soils
mediated
by
iron
(Fe)
(oxyhr)oxides,
Fe(II),
organic
matter
(OM),
and
microbes
is
largely
unexplored.
Here,
their
coupling
processes
mechanisms
were
investigated
during
anoxic
incubation
experiments
of
four
Cr(VI)
spiked
soil
samples
with
distinct
physicochemical
properties
from
the
tropical
subtropical
regions
China.
It
demonstrates
that
easily
oxidizable
carbon
(EOC,
55-84%)
(16-48%)
drive
reduction
enriched
goethite
and/or
hematite,
among
which
dryland
microbial
sulfate
may
also
be
involved.
In
contrast,
EOC
(38
±
1%),
(33
exchangeable
poorly
crystalline
Fe
(oxyhr)oxide-associated
Fe(II)
(29
3%)
contribute
to
paddy
ferrihydrite.
Additionally,
exogenous
significantly
enhance
ferrihydrite-
goethite-rich
soils,
greatly
promotes
but
slightly
inhibit
Cr
passivation.
Both
microbes,
especially
latter,
promote
OM
mineralization
result
most
substantial
loss
ferrihydrite-rich
soils.
During
incubation,
part
ferrihydrite
converts
hinder
transformation.
These
results
provide
deep
insights
into
geochemical
fates
redox-sensitive
heavy
metals
complicated
effects
Fe,
OM,
natural
engineered
environments.
