ACS ES&T Engineering,
Год журнала:
2023,
Номер
3(9), С. 1370 - 1380
Опубликована: Апрель 26, 2023
In
this
study,
we
have
developed
an
innovative
thermal
degradation
strategy
for
treating
per-
and
polyfluoroalkyl
substance
(PFAS)-containing
solid
materials.
Our
satisfies
three
criteria:
the
ability
to
achieve
near-complete
of
PFASs
within
a
short
timescale,
nonselectivity,
low
energy
cost.
our
method,
metallic
reactor
containing
PFAS-laden
sample
was
subjected
electromagnetic
induction
that
prompted
rapid
temperature
rise
via
Joule
heating
effect.
We
demonstrated
subjecting
(0.001–12
μmol)
brief
duration
(e.g.,
<40
s)
resulted
in
substantial
(>90%)
these
compounds,
including
recalcitrant
short-chain
perfluoroalkyl
sulfonic
acids.
This
finding
us
conduct
detailed
study
phase
transitions
using
thermogravimetric
analysis
differential
scanning
calorimetry
(DSC).
identified
at
least
two
endothermic
DSC
peaks
anionic,
cationic,
zwitterionic
PFASs,
signifying
melting
evaporation
melted
PFASs.
Melting
points
many
were
reported
first
time.
data
suggest
rate-limiting
step
PFAS
is
linked
with
evaporation)
occurring
on
different
time
scales.
When
are
rapidly
heated
temperatures
similar
those
produced
during
heating,
slows
down,
allowing
PFAS.
Journal of the American Chemical Society,
Год журнала:
2022,
Номер
145(1), С. 260 - 267
Опубликована: Дек. 20, 2022
Persistent
organic
pollutants
(POPs)
exist
widely
in
the
environment
and
place
significant
impact
on
human
health
by
bioaccumulation.
Efficient
recognition
of
POPs
their
removal
are
highly
challenging
tasks
because
specific
structures
interact
often
very
weakly
with
capture
materials.
Herein,
a
molecular
nanocage
(1)
is
studied
as
an
efficient
sensing
sorbent
material
for
POPs,
which
demonstrated
representative
stable
perfluorooctane
sulfonate
(PFOS)
substrate
containing
hydrophilic
sulfonic
group
hydrophobic
fluoroalkyl
chain.
A
sensitive
unusual
turn-on
fluorescence
response
within
10
s
97%
total
PFOS
from
water
20
min
have
been
achieved
owing
to
strong
host–guest
interactions
between
1
PFOS.
The
binding
constant
2
orders
magnitude
higher
than
state-of-the-art
adsorbents
thus
represents
new
benchmark
interaction
has
elucidated
solid-state
NMR
spectroscopy
single-crystal
X-ray
diffraction,
provide
key
insights
at
level
design
advanced
sensing/sorbent
materials
POPs.
Chemical Engineering Journal Advances,
Год журнала:
2022,
Номер
13, С. 100421 - 100421
Опубликована: Дек. 2, 2022
Per-
and
polyfluoroalkyl
substances
(PFAS)
are
a
set
of
synthetic
chemicals
which
contain
several
carbon-fluorine
(C-F)
bonds
have
been
in
production
for
the
past
eight
decades.
PFAS
used
industrial
consumer
products
including
nonstick
pans,
food
packaging,
firefighting
foams,
carpeting.
require
proper
investigations
worldwide
due
to
their
omnipresence
biotic
environment
resulting
pollution
drinking
water
sources.
These
harmful
associated
with
adverse
health
effects
such
as
liver
damage,
cancer,
low
fertility,
hormone
subjugation,
thyroid
illness.
In
addition,
these
fluorinated
compounds
show
high
chemical,
thermal,
biological,
hydrolytic,
photochemical,
oxidative
stability.
Therefore,
effective
treatment
processes
required
removal
degradation
from
wastewater,
water,
groundwater.
Previous
review
papers
provided
excellent
summaries
on
technologies,
but
focus
has
elimination
efficiency
without
providing
mechanistic
understanding
removal/degradation
pathways.
The
present
summarizes
comprehensive
examination
various
thermal
non-thermal
destruction
technologies.
It
includes
sonochemical/ultrasound
degradation,
microwave
hydrothermal
treatment,
subcritical
or
supercritical
electrical
discharge
plasma
technology,
methods/incinerations,
low/high-temperature
desorption
process,
vapor
energy
generator
(VEG)
technology
mechanochemical
destruction.
background,
mechanisms/pathways,
advances
each
remediation
process
discussed
detail
this
review.
Chemical Society Reviews,
Год журнала:
2023,
Номер
52(13), С. 4208 - 4247
Опубликована: Янв. 1, 2023
Herein,
we
present
the
state
of
art
technology
on
recycling,
reuse,
thermal
decomposition,
and
life
cycle
assessment
fluoropolymers
(FPs,
ranging
from
PTFE
PVDF
to
various
fluorinated
copolymers
based
VDF
TFE).
Journal of Hazardous Materials,
Год журнала:
2023,
Номер
452, С. 131212 - 131212
Опубликована: Март 15, 2023
Per-
and
polyfluoroalkyl
substances
(PFAS)
are
persistent
organic
chemicals
detected
in
biosolids
worldwide,
which
have
become
a
significant
concern
for
applications
due
to
their
increasing
environmental
risks.
Hence,
it
is
pivotal
understand
the
magnitude
of
PFAS
contamination
implement
effective
technologies
reduce
prevent
hazardous
aftermaths.
Thermal
techniques
such
as
pyrolysis,
incineration
gasification,
biodegradation
been
regarded
impactful
solutions
degrade
transform
into
value-added
products
like
biochar.
These
can
mineralize
compounds
under
specific
operating
parameters,
lead
unique
degradation
mechanisms
pathways.
Understanding
pave
way
design
technology
optimize
process
conditions.
Therefore,
this
review,
we
aim
review
compare
thermal
treatment
incineration,
smouldering
combustion,
hydrothermal
liquefaction
(HTL),
biodegradation.
For
instance,
perfluorooctane
sulfonic
acid
(PFOS),
firstly
C-S
bond
cleavage
occurs
followed
by
hydroxylation,
decarboxylation
defluorination
reactions
form
perfluoroheptanoic
acid.
In
HTL,
PFOS
carried
through
OH-catalyzed
series
nucleophilic
substitution
reactions.
contrast,
involves
three-step
random-chain
scission
pathway.
The
first
step
includes
cleavage,
perfluoroalkyl
radical,
radical
chain
propagation
Finally,
termination
produces
very
short-fluorinated
units.
We
also
highlighted
important
policies
strategies
employed
worldwide
curb
biosolids.
Environmental Science & Technology Letters,
Год журнала:
2023,
Номер
10(2), С. 198 - 203
Опубликована: Янв. 9, 2023
Studies
on
the
destruction
of
solid
per-
and
polyfluoroalkyl
substances
(PFAS)
chemicals
PFAS-laden
wastes
significantly
lag
behind
urgent
social
demand.
There
is
a
great
need
to
develop
novel
treatment
processes
that
can
destroy
nonaqueous
PFAS
at
ambient
temperatures
pressures.
In
this
study,
we
piezoelectric-material-assisted
ball
milling
(PZM-BM)
process
built
principle
collisions
during
activate
PZMs
generate
∼kV
potentials
for
in
absence
solvents.
Using
boron
nitride
(BN),
typical
PZM,
as
an
example,
successfully
demonstrate
complete
near-quantitative
(∼100%)
defluorination
PFOS
perfluorooctanoic
acid
(PFOA)
after
2
h
treatment.
This
was
also
used
treat
PFAS-contaminated
sediment.
Approximately
80%
21
targeted
were
destroyed
6
The
reaction
mechanisms
determined
be
combination
piezo-electrochemical
oxidation
fluorination
BN.
PZM-BM
demonstrates
many
potential
advantages,
degradation
diverse
independent
functional
group
chain
configurations
does
not
require
caustic
chemicals,
heating,
or
pressurization.
pioneering
study
lays
groundwork
optimizing
various
wastes.
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(14), С. 9811 - 9818
Опубликована: Март 26, 2024
Perfluorooctanoic
acid
(PFOA)
is
an
environmental
contaminant
ubiquitous
in
water
resources,
which
as
a
xenobiotic
and
carcinogenic
agent,
severely
endangers
human
health.
The
development
of
techniques
for
its
efficient
removal
therefore
highly
sought
after.
Herein,
we
demonstrate
unprecedented
zirconium-based
MOF
(PCN-999)
possessing
Zr6
biformate-bridged
(Zr6)2
clusters
simultaneously,
exhibits
exceptional
PFOA
uptake
1089
mg/g
(2.63
mmol/g),
representing
ca.
50%
increase
over
the
previous
record
MOFs.
Single-crystal
X-ray
diffraction
studies
computational
analysis
revealed
that
offer
additional
open
coordination
sites
hosting
PFOA.
coordinated
PFOAs
further
enhance
interaction
between
free
physical
adsorption,
boosting
adsorption
capacity
to
unparalleled
high
standard.
Our
findings
represent
major
step
forward
fundamental
understanding
MOF-based
mechanism,
paving
way
toward
rational
design
next-generation
adsorbents
per-
polyfluoroalkyl
substance
(PFAS)
removal.
Sustainability,
Год журнала:
2024,
Номер
16(6), С. 2382 - 2382
Опубликована: Март 13, 2024
Trifluoroacetic
acid
(TFA)
is
a
known
and
persistent
pollutant
in
the
environment.
Although
several
direct
anthropogenic
sources
exist,
production
from
atmospheric
degradation
of
fluorocarbons
such
as
some
hydrofluorocarbons
(HFCs)
has
been
source
for
time.
The
current
transition
HFCs
to
HFOs
(hydrofluoroolefins)
beneficial
global
warming
viewpoint
because
are
much
shorter-lived
pose
smaller
threat
terms
warming,
but
fraction
converted
into
TFA
higher
than
seen
corresponding
region
which
produced
close
source.
Therefore,
it
timely
review
role
Earth’s
This
considers
its
toxicity,
removal
processes,
measurement
variety
environments,
future
prospects.
New
model
integrations
used
quantify
impacts
uncertainties
on
levels
using
Henry’s
Law
constant
range
gas-phase
kinetic
parameters
chosen
reaction
OH
radicals
with
representative
HFO
(HFO-1234yf).
Model
runs
suggest
that
surface
concentrations
vary
by
up
10%
based
data
could
be
25%
previously
modelled
values
depending
analysis
adopted.
estimates
require
updating
warrants
further
investigation.
toxicity
appears
low,
studies
wider
animal
plant
types
required.
Advanced Materials,
Год журнала:
2024,
Номер
36(37)
Опубликована: Фев. 12, 2024
Abstract
The
application
of
homogeneous
catalysts
in
water
remediation
is
limited
by
their
excessive
chemical
and
energy
input,
weak
regenerability,
potential
leaching.
Heterogeneous
catalytic
membranes
(CMs)
offer
a
new
approach
to
facilitate
efficient,
selective,
continuous
pollutant
degradation.
Thus,
integrating
filtration
with
heterogeneous
advanced
oxidation
processes
(AOPs)
can
promote
thermodynamic
kinetic
mass
transfers
spatially
confined
intrapores
diffusion‐reaction
processes.
Despite
the
remarkable
advantages
CMs,
engineering
practically
restricted
due
fuzzy
design
criteria
for
specific
applications.
Herein,
recent
advances
CMs
are
critically
reviewed
flow
tempospatially
proposed.
Further,
state‐of‐the‐art
CM
materials
mechanisms
reviewed,
after
which
tempospatial
confinement
comprising
nanoconfinement
effect,
interface
transfer
emphasized,
thus
clarifying
roles
construction
performance
optimization
CMs.
Additionally,
fabrication
methods
based
on
pore
sizes
summarized
an
overview
evaluations
presented.
Finally,
future
directions
research
treatment,
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
unknown
Опубликована: Апрель 8, 2024
Because
of
their
innate
chemical
stability,
the
ubiquitous
perfluoroalkyl
and
polyfluoroalkyl
substances
(PFASs)
have
been
dubbed
"forever
chemicals"
attracted
considerable
attention.
However,
stability
under
environmental
conditions
has
not
widely
verified.
Herein,
perfluorooctanoic
acid
(PFOA),
a
used
detected
PFAS,
was
found
to
be
spontaneously
degraded
in
aqueous
microdroplets
room
temperature
atmospheric
pressure
conditions.
This
unexpected
fast
degradation
occurred
via
unique
multicycle
redox
reaction
PFOA
with
interfacial
reactive
species
on
droplet
surface.
Similar
observed
for
other
PFASs.
study
extends
current
understanding
fate
chemistry
PFASs
provides
insight
into
aid
development
effective
methods
removing
