Nanomaterials,
Год журнала:
2023,
Номер
13(10), С. 1668 - 1668
Опубликована: Май 18, 2023
This
review
focuses
on
a
critical
analysis
of
nanocatalysts
for
advanced
reductive
processes
(ARPs)
and
oxidation
(AOPs)
designed
the
degradation
poly/perfluoroalkyl
substances
(PFAS)
in
water.
Ozone,
ultraviolet
photocatalyzed
ARPs
and/or
AOPs
are
basic
treatment
technologies.
Besides
nanomaterials
with
greater
potential
as
catalysts
PFAS
water,
perspectives
their
future
development,
considering
sustainability,
discussed.
Moreover,
brief
current
state
art
water
is
presented.
Environmental Science & Technology,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 12, 2025
At
present,
the
defluorination
of
per-
and
polyfluoroalkyl
substances
(PFASs),
including
perfluoroether
compounds
as
substitutes
perfluorooctanoic
acid
(PFOA)
perfluorooctanesulfonate,
is
limited
by
effective
active
species
produced
during
oxidation-reduction
process.
The
contribution
hydrogen
radical
(•H)
a
companion
substance
in
photoreduction
electrocatalytic
degradation
PFASs
has
been
neglected.
Herein,
we
demonstrate
that
perfluorocarboxylic
acids
such
PFOA
hexafluoropropylene
oxide
dimer
(GenX)
underwent
near-complete
photodegradation
continuously
generating
•H
through
perfluoroalkyl
activation
water
under
UV
irradiation
without
any
reagents
catalysts.
Importantly,
initial
dissolved
oxygen,
H+,
impurities
surface
scarcely
inhibited
PFASs.
difference
mechanism
between
GenX
action
was
elucidated
combining
theoretical
calculations
with
targeted
nontargeted
analysis
methods.
investigation
different
indicates
were
not
easily
photodegraded
via
reduction
compared
other
compounds,
whereas
polyfluorinated
which
some
F
atoms
replaced
Cl
more
prone
to
elimination.
However,
UV/•H
system
ineffective
against
perfluorosulfonic
acids.
This
study
provides
an
unprecedented
perspective
for
further
development
removal
technology
design
alternative
are
easy
eliminate.
Toxics,
Год журнала:
2025,
Номер
13(2), С. 135 - 135
Опубликована: Фев. 13, 2025
Organic
pollutants
like
per-
and
polyfluoroalkyl
substances
(PFASs)
exhibit
persistence,
bioaccumulation,
resistance
to
degradation,
high
toxicity,
garnering
significant
attention
from
scholars
worldwide.
To
better
address
mitigate
the
environmental
risks
posed
by
PFASs,
this
paper
employs
bibliometric
analysis
examine
literature
on
PFASs'
concentrations
collected
in
Web
of
Science
(WoS)
database
between
2019
2024.
The
results
show
that
overall
trend
pollution
research
is
relatively
stable
increasing.
In
addition,
study
also
summarizes
status
traditional
PFASs
across
different
media
typical
freshwater
basins.
It
analyzes
surface
water,
sediment,
aquatic
organisms,
elucidating
their
distribution
characteristics
potential
sources.
While
perfluorooctanoic
acid
(PFOA)
perfluorooctane
sulfonic
(PFOS)
levels
water
environments
are
declining
annually,
short-chain
substitutes
emerging
as
primary
pollutants.
Short-chain
frequently
detected
whereas
long-chain
tend
accumulate
sediments.
more
likely
concentrate
protein-rich
organs
tissues.
presence
largely
influenced
human
activities,
such
metal
plating,
fluoride
industry
development,
industrial
wastewater
discharge.
Currently,
development
China
faces
a
complex
dilemma,
entangled
policy
legal
constraints,
production
demands,
use
new
alternatives,
regulation
restriction,
creating
vicious
cycle.
Breaking
deadlock
necessitates
continuous
active
scientific
particularly
PFOS,
with
an
emphasis
detailed
investigations
sources
sinks.
Furthermore,
ecological
health
risk
assessments
were
conducted
using
Risk
Quotient
(RQ)
Hazard
(HQ)
methods.
Comprehensive
comparison
indicates
(such
PFOA)
majority
basins
at
low-risk
level
(RQ
<
0.1
or
HQ
0.2),
PFOS
some
medium-risk
(0.1
RQ
1),
no
basin
high-risk
level.
adsorption
removal
approaches
analyzed,
revealing
combination
multiple
treatment
technologies
novel
integrated
technology
holds
excellent
prospects
for
PFASs.
Journal of Hazardous Materials Advances,
Год журнала:
2023,
Номер
10, С. 100322 - 100322
Опубликована: Май 1, 2023
Per-
and
poly-fluoroalkyl
substances
(PFAS)
have
emerged
as
contaminants
of
great
concern
that
are
ubiquitously
detected
in
natural
aquatic
environments.
Strict
health
advisories
regulations
triggered
development
several
treatment
processes
to
remove
or
degrade
PFAS.
However,
the
main
challenge
affects
implementation
both
physical-separation
degradation
real
world
applications
is
quality
water
be
treated.
Organic
inorganic
constituents,
defining
quality,
accompany
PFAS
influent
processes.
Thus,
this
article
aims
provide
a
detailed
review
impacts
such
constituents
on
(i.e.,
carbon-based,
natural,
synthetic
adsorbents,
ion-exchange
resins,
membranes)
sonolysis,
photochemical,
electrochemical,
heat-activated
persulfate,
plasma-based
treatment,
ionizing
radiation)
Depending
mechanisms,
solutes
shown
inhibitory,
promotive,
neutral
effects
treatment.
This
elucidates
matrix
largely
dependent
(1)
organic
matters
characteristics
(e.g.,
molecular
weight,
aromaticity,
functional
groups),
(2)
operational
parameters
type
resin,
anode
material,
surface
charge
solution
pH),
(3)
properties
chain
length
group).
The
information
data
presented
here
beneficial
from
theoretical
practical
perspectives
for
degradation.
Journal of Hazardous Materials Advances,
Год журнала:
2023,
Номер
9, С. 100252 - 100252
Опубликована: Фев. 1, 2023
Perfluorooctanoic
acid
(PFOA)
has
received
extensive
attention
due
to
its
widespread
distribution
in
the
environment
and
concerns
of
exposure
human
health.
Nano-MgAl2O4
modified
carbon
nanotubes
(CNTs)
were
synthesized,
characterized,
used
as
nanoadsorbents
remove
ppb
(μg/L)-levels
PFOA
from
drinking
water
brackish
groundwater.
Nano-MgAl2O4@CNTs
composite
materials
characterized
by
UV-Vis,
FT-IR,
DLS,
p-XRD,
BET,
SEM
with
EDX.
The
adsorption
isotherms
kinetic
studies
fitted
a
Freundlich
pseudo-second-order
models,
respectively.
Composite
nano-MgAl2O4@CNTs
over
99%
(100
ppb)
3
hours,
completely
(100%)
3.5
hours.
optimal
pH
range
is
under
mild
alkaline
conditions
(pH
=
7.5-9.0).
Electrostatic
hydrophobic
interactions
drive
onto
MgAl2O4@CNTs.
data
ground
samples
indicated
that
an
efficient
nanoadsorbent
for
removal.
