Environmental Science & Technology Letters,
Journal Year:
2023,
Volume and Issue:
10(5), P. 418 - 424
Published: April 12, 2023
Perfluoroalkyl
acids
(PFAAs)
are
widely
distributed
in
the
oceans
which
their
largest
global
reservoir,
but
knowledge
is
limited
about
vertical
distribution
and
fate.
This
study
measured
concentrations
of
PFAAs
(perfluoroalkyl
carboxylic
(PFCAs)
with
6
to
11
carbons
perfluoroalkanesulfonic
(PFSAs)
8
carbons)
surface
deep
ocean.
Seawater
depth
profiles
from
a
5000
m
at
28
sampling
stations
were
collected
Atlantic
Ocean
∼50°
N
S.
The
results
demonstrated
PFAA
input
Mediterranean
Sea
English
Channel.
Elevated
observed
eastern
edge
Northern
Subtropical
Gyre,
suggesting
that
persistent
contaminants
may
accumulate
ocean
gyres.
median
ΣPFAA
concentration
Hemisphere
(n
=
17)
was
105
pg
L-1,
while
for
Southern
11)
it
L-1.
Generally,
decreased
increasing
distance
coast
depth.
C6-C9
PFCAs
C6
C8
PFSAs
dominated
waters,
longer-chain
(C10-C11
PFCAs)
peaked
intermediate
depths
(500-1500
m).
profile
be
explained
by
stronger
sedimentation
PFAAs,
as
they
sorb
more
strongly
particulate
organic
matter.
Land Degradation and Development,
Journal Year:
2024,
Volume and Issue:
35(8), P. 2700 - 2715
Published: April 3, 2024
Abstract
Soil
and
groundwater
contamination
has
always
been
a
global
concern.
Contaminants
are
migrated
transformed
in
the
soil
environments,
which
turn
pose
potential
environmental
risks
to
humans.
This
paper
describes
four
typical
contaminants,
including
heavy
metals,
polycyclic
aromatic
hydrocarbons,
microplastics,
perfluorinated
polyfluoroalkyl
substances.
Based
on
systematic
summary
of
sources,
hazards,
migration
behaviors
these
various
existing
remediation
methods
analyzed,
advantages
disadvantages
different
discussed.
Finally,
future
research
prospects
described,
significance
study
contaminant
subsurface
environment
is
emphasized.
can
help
provide
theoretical
technical
support
for
removal
further
improve
rate
actual
sites.
Biochar,
Journal Year:
2025,
Volume and Issue:
7(1)
Published: Jan. 17, 2025
Abstract
Per-
and
polyfluoroalkyl
substances
(PFASs),
commonly
known
as
‘‘forever
chemicals’’,
are
persistent
organic
pollutants
that
widely
distributed
in
the
environment.
Due
to
their
toxicity
resistance
degradation,
PFASs
classified
emerging
contaminants,
increasing
attention
is
being
paid
remediation.
Biochar,
an
environmentally
friendly
cost-effective
adsorbent,
shows
potential
for
remediating
contamination.
The
application
of
biochar
remediation
has
garnered
growing
interest.
Compared
other
adsorbents,
more
economical
raw
materials
its
preparation
readily
available.
However,
there
currently
no
comprehensive
review
summarizing
effects
on
environmental
behavior
PFASs.
This
aims
fill
gap
by
providing
in-depth
discussion
synthesis
existing
literature
this
area.
It
focuses
PFASs,
specifically
addressing
adsorption
mechanisms
factors
influencing
effectiveness
A
proposed
mechanism
which
photodegrades
through
generation
free
radicals,
addition
conventional
(such
pore
filling,
hydrogen
bonding,
hydrophobic
interactions,
electrostatic
interactions),
explored.
Furthermore,
discusses
ability
reduce
likelihood
entering
food
chain
water
soil
evaluates
feasibility
limitations
using
removal.
Finally,
we
identify
future
research
directions
support
safe
effective
use
remediation,
so
promote
advancement
green
technologies.
Graphic
Toxics,
Journal Year:
2023,
Volume and Issue:
11(5), P. 446 - 446
Published: May 9, 2023
Per-
and
polyfluoroalkyl
substances
(PFASs),
highly
stable
synthetic
organic
compounds
with
multiple
carbon-fluorine
bonds,
are
emerging
as
environmental
contaminants,
toxic,
bioaccumulative,
environmentally
persistent.
PFASs
strongly
resistant
to
biological
chemical
degradation,
therefore
present
a
challenge
researchers
scientists
for
better
understanding
application
of
remediation
methods
biodegradation
have
become
subject
strict
government
regulations.
The
review
summarizes
the
recent
knowledge
bacterial
fungal
degradation
PFASs,
well
enzymes
involved
in
processes
transformation/degradation
PFASs.
Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(13), P. 5231 - 5242
Published: March 22, 2023
A
comprehensive,
generalized
approach
to
predict
the
retention
of
per-
and
polyfluoroalkyl
substances
(PFAS)
from
aqueous
film-forming
foam
(AFFF)
by
a
soil
matrix
as
function
PFAS
molecular
physiochemical
properties
was
developed.
An
AFFF
with
34
major
(12
anions
22
zwitterions)
added
uncontaminated
in
one-dimensional
saturated
column
experiments
mass
retained
measured.
described
using
an
exhaustive
statistical
generate
poly-parameter
quantitative
structure–property
relationship
(ppQSPR).
The
relevant
predictive
were
molar
mass,
fluorine,
number
nitrogens
molecule,
poorly
crystalline
Fe
oxides,
organic
carbon,
specific
(BET-N2)
surface
area.
anionic
nearly
independent
largely
hydrophobicity,
size
fluorinated
side
chain
main
predictor.
Retention
nitrogen-containing
zwitterionic
related
metal
oxides
carbon
content.
Knowledge
extent
which
suite
may
respond
variations
properties,
developed
here,
paves
way
for
development
reactive
transport
algorithms
ability
capture
dynamics
source
zones
over
extended
time
frames.
