Journal for Research in Applied Sciences and Biotechnology,
Journal Year:
2023,
Volume and Issue:
2(3), P. 317 - 323
Published: June 30, 2023
Through
this
research,
information
on
methods
of
PFAS
degradation
through
thermal
destruction
processes
and
analysis
the
efficiency
by
temperature
conditions
in
atmosphere
is
provided.
These
experiments
were
carried
out
at
different
temperatures
from
400°C
to
1,200°C
under
both
reducing
oxidizing
setter
gases.
The
findings
suggest
that
plays
a
big
role
rates
with
oxidative
promoting
PFAS.
results
obtained
showed
900°C
above
was
over
90%
as
well
low
content
toxic
compounds.
developed
study
suggests
high
can
be
viable
technique
for
PFASs,
but
heat
energy
consumption
formation
by-products
should
controlled.
Anion
exchange
resins
(AERs)
have
been
widely
used
for
the
removal
of
perfluoroalkyl
and
polyfluoroalkyl
substances
(PFAS)
from
water.
However,
regardless
whether
AERs
are
regenerable
or
single
use,
disposal
end-of-life
presents
significant
challenges.
Conventional
waste
management
strategies,
such
as
landfill
incineration,
increasingly
under
scrutiny
may
face
impending
bans
due
to
environmental
concerns.
This
study
introduces
a
nonthermal,
solvent-free
process
effective
destruction
PFAS
on
by
co-milling
piezoelectric
boron
nitride
(BN)
powders
with
contaminated
stainless
steel
(SS)
balls.
The
approach
achieved
complete
PFOS
in
two
types
(PFA694E
AmberLite
IRA
67),
near-quantitative
(∼100%)
defluorination
observed
treatment
PFA694E
AER.
Comprehensive
targeted
analysis
suspect
screening
transformation
products
(TPs)
elucidated
reaction
mechanisms
confirmed
that
functional
groups
did
not
participate
reaction.
process's
effectiveness
was
further
validated
treating
field-collected
single-use
(PFA694
PSR2
Plus)
mixtures
varying
chain
lengths
head
groups.
After
treatment,
levels
were
reduced
below
nanogram
per
gram
detection
limits,
no
release
standard
leaching
tests.
Journal of Separation Science,
Journal Year:
2024,
Volume and Issue:
47(15)
Published: Aug. 1, 2024
Poly-
and
perfluoroalkyl
substances
(PFAS)
are
a
class
of
persistent
organic
pollutants
whose
high
stability
appreciable
water
solubility
have
led
to
near-global
contamination.
PFAS
bioaccumulative
toxins
that
been
linked
myriad
disorders
detected
nearly
universally
in
human
blood.
Liquid
chromatography-tandem
mass
spectrometry
is
the
most
frequent
method
used
for
quantitation,
though
this
typically
only
measures
few
dozen
>14
000
known
has
shown
account
small
portion
total
fluorine
present.
Sum
parameter
methods
such
as
total,
extractable,
adsorbable
emerged
alternative
measurements
determination.
Combustion
ion
chromatography
become
preferred
organofluorine
measurement
where
sorbent
or
extract
containing
combusted
emitted
hydrofluoric
acid
(HF)
measure
cumulative
Herein
we
critically
review
types
measurement,
their
separation
from
sample
matrix,
key
parameters
analytical
instrument
affect
sensitivity,
reproducibility,
recovery
with
regards
analysis.
The
products
of
incomplete
destruction
(PIDs)
per-
and
polyfluoroalkyl
substances
(PFAS)
represent
a
substantial
ambiguity
when
employing
thermal
treatments
to
remediate
PFAS-contaminated
materials.
In
this
study,
we
present
new
information
on
PIDs
produced
in
both
inert
oxidative
environments
from
five
long-chain
PFAS,
including
three
now
regulated
under
the
U.S.
Safe
Drinking
Water
Act,
one
cationic
precursor
compound,
C10
PFAS.
data
did
not
support
generation
tetrafluoromethane
any
studied
carbonyl
fluoride
was
found
only
potassium
perfluorooctanesulfonate
(K-PFOS)
heated
air
narrow
temperature
range.
Oxidative
conditions
(air)
were
observed
facilitate
PFAS
degradation
accelerate
mineralization
K-PFOS.
Spectroscopic
suggest
that
is
initiated
by
cleavage
bonds
form
perfluoroalkyl
radicals,
leading
organofluorine
(e.g.,
perfluoroalkenes).
air,
radicals
react
with
oxygen
oxygen-containing
PIDs.
enhanced
adding
solid
additives,
which
categorized
as
highly
effective
granular
activated
carbon
(GAC)
certain
noble
metals),
moderately
effective,
noneffective.
Remarkably,
simply
GAC,
achieved
>90%
perfluorooctanoic
acid
at
300
°C
∼1.9
atm
within
just
60
min
without
using
water
or
solvents.
ACS ES&T Engineering,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 11, 2024
Perfluorocarbons
(PFCs)
are
synthetic
industrial
chemicals,
which,
once
released
into
the
atmosphere,
exhibit
strong
greenhouse
effects.
They
also
potential
products
of
incomplete
degradation
per-
and
polyfluoroalkyl
substances
in
thermal
processes.
This
study
aims
to
fill
a
significant
gap
literature
regarding
stability
PFCs.
Among
PFCs
examined,
perfluorohept-1-ene
(C7F14)
perfluorooct-1-ene
(C8F16)
degraded
at
temperatures
as
low
200
°C,
achieving
near-complete
approximately
300
°C.
The
mineralization
these
two
unsaturated
reached
up
∼40
mol
%
between
°C
500
In
contrast,
their
saturated
counterparts
required
significantly
higher
(≥600
°C)
for
similar
levels
yielded
less
than
10
fluorine.
disparity
is
likely
due
hemolytic
cleavage
relatively
weak
C3–C4
bonds
PFCs,
initiating
radical-chain
reactions
that
release
analysis
indicates
pathways
perfluoroalkenes
predominantly
involve
chain
scission
cyclization,
leading
formation
various
linear
cyclic
byproducts,
particularly
below
addition
granular
activated
carbon
enhanced
whereas
common
commercial
catalysts
were
only
moderately
effective
or
ineffective.
