Chemosphere,
Journal Year:
2023,
Volume and Issue:
341, P. 139972 - 139972
Published: Aug. 26, 2023
Non-thermal
plasma
is
a
promising
tool
for
novel
technologies
to
treat
water
contaminated
by
recalcitrant
pollutants.
We
report
here
on
products,
reactive
species
and
mechanisms
of
the
efficient
degradation
perfluorooctanoic
acid
(PFOA)
achieved
with
self-pulsing
discharge
developed
previously
in
our
lab.
Air
or
argon
were
used
as
feed
gas,
ultrapure
tap
aqueous
medium.
Identified
organic
intermediate
products
arise
from
chain-shortening
defluorination
reactions,
latter
achieving
not
only
C-F
C-H
exchange
(hydro-de-fluorination),
reported
literature,
but
also
C-OH
(hydroxy-de-fluorination).
In
contrast
chain-shortening,
yielding
lower
homologues
PFOA
via
selective
cleavage
C-C
bond
at
carboxylate
group,
occurs
various
sites
alkyl
chain
giving
mixtures
different
isomeric
products.
Plasma
generated
investigated
under
all
experimental
conditions
tested,
using
specific
chemical
probes
optical
emission
spectroscopy.
Cross-analysis
results
revealed
striking
direct
correlation
energy
efficiency
production
electrons.
contrast,
no
was
observed
bands
either
Ar+
OH
radical.
These
indicate
prevalent
role
electrons
initiating
above
liquid.
Eco-Environment & Health,
Journal Year:
2024,
Volume and Issue:
3(3), P. 355 - 368
Published: June 27, 2024
The
detection
of
per-
and
polyfluoroalkyl
substances
(PFAS)
in
water
presents
a
significant
challenge
for
developing
countries,
requiring
urgent
attention.
This
review
focuses
on
understanding
the
emergence
PFAS
drinking
water,
health
concerns,
removal
strategies
systems
countries.
indicates
need
more
studies
to
be
conducted
many
nations
due
limited
information
environmental
status
fate
PFAS.
consequences
are
enormous
cannot
overemphasized.
Efforts
ongoing
legislate
national
standard
water.
Currently,
there
few
known
mitigation
efforts
from
African
contrast
several
Asia.
Therefore,
is
an
develop
economically
viable
techniques
that
could
integrated
into
large-scale
operations
remove
region.
However,
despite
success
achieved
with
removing
long-chain
required
eliminating
short-chain
moieties
