Bioremediation Journal,
Год журнала:
2024,
Номер
unknown, С. 1 - 14
Опубликована: Март 14, 2024
Cr(VI)
is
one
of
the
most
widely
used
elements
in
various
industrial
sectors
and,
hence,
extensively
found
as
a
toxicant
ecosystem.
The
biotransformation
via
microorganisms
considered
an
ecofriendly
approach
for
its
detoxification.
present
study
focused
on
isolation
indigenous
bacterium
from
municipal
solid
waste
dumpsite
soils
with
relatively
higher
resistance
(>1000
mg
L−1
broth)
and
97%
reduction
(100
L−1)
under
conditions
37
°C,
pH
7,
120
rpm
48
h.
biochemical
16
S
rRNA
gene
sequencing
showed
that
isolate
exhibits
99%
similarity
Mammaliicoccus
sciuri.
Partial
reductase
sequences
were
retrieved,
showing
96%
to
NADPH-dependent
FMN
reductases.
Fourier
transform
infrared
spectroscopy,
scanning
electron
microscopy-energy
dispersive
X-ray
spectroscopy
presence
Cr
products
bacterial
cells.
photoelectron
spectroscopic
analysis
confirmed
valence
state
residual
Cr(III).
Furthermore,
quantitative
localization
reduced
transmission
microscopic
intracellular
accumulation
A
multifaceted
mechanism,
including
surface
adsorption
bioaccumulation
after
biotransformation,
confers
potential
identity
strain
sciuri
jv5
toward
remediation
polluted
environment
niche.
Environmental Technology & Innovation,
Год журнала:
2024,
Номер
33, С. 103521 - 103521
Опубликована: Янв. 5, 2024
In
this
research
it
was
possible
to
analyze
the
capacity
of
Acinetobacter
sp.
(ADHR1)
bacteria
reduce
chromium
(VI).
The
identified
by
phenotypic
and
genotypic
methods
were
isolated
from
residual
effluents
automobile
chrome
plating
processes
auto
parts.
ADHR1
able
100
percent
Cr(VI)
Cr(III),
resulting
in:
100-500
mg
/
L
in
a
lapse
time
between
18
24
hours;
likewise,
show
reduction
process
concentrations
2000
which
73%
as
result.
addition
this,
also
that
planktonic
cells
had
greater
hexavalent
compared
biofilm
cells.
ChrR
gene
amplified
PCR
confirming
presence
chromate
reductase
enzyme.
attributed
nicotinamide
adenine
dinucleotide
hydrogen
(NADH)
dependent
enzyme
cytosolic
fraction
membrane
associated
fraction.
conclusion,
sp,
strain
used
study
showed
great
potential
different
Cr(VI).
This
represents
truly
eco-friendly
alternative
removal
sites
contaminated
metals,
knowing
has
ability
Green Chemistry Letters and Reviews,
Год журнала:
2024,
Номер
17(1)
Опубликована: Март 19, 2024
In
this
study,
we
evaluated
the
effect
of
modification
biochar
on
adsorption
Cr(VI)
under
weakly
acidic
conditions.
Sesame
straw
(BC)
was
modified
by
treatment
with
ferric
chloride
to
produce
iron-modified
(FBC)
and
chlorapatite
iron-doped
chlorapatite-modified
(FBCP).
Analysis
scanning
electron
microscopy
(SEM),
Fourier-transform
infrared
spectroscopy
(FTIR),
X-ray
diffraction
(XRD)
showed
that
mechanism
FBC
FBCP
reduction,
physical
adsorption,
ion
exchange,
functional
group
complexation.
Experiments
were
performed
evaluate
kinetic,
isothermal,
thermodynamic
characteristics
demonstrating
a
spontaneous
endothermic
reaction,
consistent
pseudo-second-order
kinetic
model
Langmuir
model,
process
dominated
monolayer
chemical
adsorption.
The
revealed
maximum
saturated
capacities
for
7.907
12.625
mg/g
FBCP,
respectively,
equating
4.06
6.48
times
capacity
BC,
respectively.
Compared
FBC,
phosphate
ions
in
also
co-precipitated
Cr(III),
further
improving
removal
efficiency
pollutants.
Frontiers in Microbiology,
Год журнала:
2023,
Номер
14
Опубликована: Авг. 10, 2023
Microbial
reduction
is
an
effective
way
to
deal
with
hexavalent
chromium
[Cr(VI)]
contamination
in
the
environment,
which
can
significantly
mitigate
biotoxicity
and
migration
of
this
pollutant.
The
present
study
investigated
influence
environmental
factors
on
aqueous
Cr(VI)
removal
by
a
newly
isolated
facultative
anaerobic
bacterium,
Exiguobacterium
sp.
PY14,
revealed
mechanism.
This
strain
minimum
inhibitory
concentration
400
mg/L
showed
strongest
capacity
at
pH
8.0
because
its
basophilic
nature,
was
obviously
depressed
increasing
initial
under
both
aerobic
conditions.
In
contrast,
rate
constant
for
50
conditions
(1.82
×
10
−2
h
−1
)
3.3
times
that
co-existence
Fe(III)
Cu(II)
promoted
Cr(VI),
while
Ag(I),
Pb(II),
Zn(II),
Cd(II)
inhibited
it.
Electron-shuttling
organics
such
as
riboflavin,
humic
acid,
anthraquinone-2,6-disulfonate
varying
degrees,
enhancement
more
significant
PY14
demonstrated
be
due
cytoplasmic
rather
than
extracellular
analyzing
contributions
different
cell
components,
end
products
existed
solution
form
organo-Cr(III)
complexes.
Several
possible
genes
involved
metabolism,
including
chrR
chrA
encode
well-known
Chr
family
proteins
responsible
chromate
transport,
respectively,
were
identified
genome
further
clarified
pathway
strain.
research
progress
crucial
biological
mechanisms
will
help
promote
potential
application
high
adaptability
stress
actual
environment.
Chemical Communications,
Год журнала:
2024,
Номер
60(85), С. 12315 - 12332
Опубликована: Янв. 1, 2024
Microbial
transformation
processes
of
heavy
metals,
including
immobilization,
oxidation
or
reduction,
and
(de)methylation,
can
provide
various
bioremediation
strategies
for
metals-contaminated
enviroments.
