Journal of environmental chemical engineering,
Journal Year:
2023,
Volume and Issue:
11(3), P. 110041 - 110041
Published: May 3, 2023
In
this
work,
the
electrochemical
oxidation
of
gaseous
streams
polluted
with
three
different
volatile
organic
compounds
(benzene,
toluene,
and
p-xylene,
known
as
BTX)
was
evaluated
using
a
jet
mixer
cell
device.
Efficiency
reached
by
technology
in
production
hydrogen
peroxide
14%
at
atmospheric
pressure
12
°C.
Results
demonstrate
suitability
electrochemically
assisted
absorption
for
treatment
streams.
electrolytic
(ELAA),
keeping
ratio
gas
flowrate
/
current
intensity
20
L
h−1
A−1,
removal
efficiencies
3.14,
1.59,
0.88
mmol
A−1
were
attained
benzene,
respectively.
These
values
increased
up
to
12.00,
3.26
1.15
h−1,
respectively,
when
Fe
(2+)
salt
added
electrolyte
solution
promote
formation
Fenton
reagent,
pointing
out
higher
electro-Fenton
(EFAA).
The
transient
response
systems
lasted
after
four
hours
operation
concentration
pollutants
absorbed
decreased
sequence
benzene
>
toluene
p-xylene
(because
their
solubility
aqueous
solutions)
processes
physical
(PA)
(ELAA)
(EFAA)
reactivity).
Only
very
low
concentrations
carboxylic
acids
(oxalic
malonic)
accumulated
absorbent
during
process,
that
mineralization
these
VOCs
primary
reaction
pathway.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(19)
Published: March 11, 2024
Abstract
Photocatalytic
upcycling
and
depolymerization
of
vinyl
polymers
have
emerged
as
promising
strategies
to
combat
plastic
pollution
promote
a
circular
economy.
This
mini
review
critically
summarizes
current
developments
in
the
degradation
including
polystyrene
poly(meth)acrylates.
Of
these
material
classes,
polymethacrylates
possess
unique
possibility
undergo
photocatalytic
back
monomer
under
thermodynamically
favourable
conditions,
thus
presenting
significant
advantages
over
traditional
thermal
strategies.
Our
perspective
on
formidable
challenges
potential
future
directions
are
also
discussed.
Green Chemistry,
Journal Year:
2022,
Volume and Issue:
24(19), P. 7305 - 7331
Published: Jan. 1, 2022
Chemical
industry
needs
and
gaps
regarding
its
transformation
to
fossil-free
production
meet
the
targets
for
net-zero
emissions
by
year
2050
are
presented.
Plastics
show
the
strongest
production
growth
of
all
bulk
materials
over
last
decade.
The
industry's
current
trajectory
is
exponential
and
plastic
expected
to
double
or
triple
by
2050.
rapidly
increasing
plastics
continued
reliance
on
fossil
fuels
for
production,
have
contributed
numerous
environmental
problems
health
harms.
As
a
result,
pollution
has
become
an
threat
natural
ecosystems,
human
climate.
However,
there
lack
granularity
contribution
primary
specifically
greenhouse
gas
(GHG)
emissions
their
impact
remaining
global
carbon
budget
needed
stay
below
1.5°C
2°C
average
temperature
rise.
In
this
report,
we
explore
climate
change
disaggregated
polymer
technology.
To
end,
developed
comprehensive
bottom-up
modeling
GHG
from
with
special
focus
value
chains.
We
analyzed
results
under
various
scenarios
in
context
budgets
compatible
trajectory.
Modeling
includes
material
flows
stages,
processes
technologies
used
chains,
including
extraction
required
shaping
final
product.
nine
major
types
fuel-based
polymers
that
are
produced
consumed
large
quantities:
three
polyethylene
(PE)
–
low-density
(LDPE),
linear
(LLDPE),
high-density
(HDPE)
as
well
polypropylene
(PP);
terephthalate
(PET);
polyvinyl
chloride
(PVC);
polystyrene
(PS)
other
key
styrene-based
such
styrene
acrylonitrile
(SAN)
butadiene
(ABS),
polyurethane
(PU).
Together
these
account
about
80%
production.
Our
estimates
generated
2.24
gigatonnes
dioxide
equivalent
(GtCO2e)
2019,
representing
5.3%
total
(excluding,
agriculture
LULUCF
(Land
Use,
Land-Use
Change
Forestry)).
Emissions
combustion
process
heat
electricity
non-combustion
processes.
Approximately
22%,
21%,
15%
related
2019
come
PEs
together,
PET,
PP,
respectively.
Other
plastics,
i.e.,
PVC,
PS,
SAN,
ABS,
PU
responsible
around
23%
Most
(~75%)
occur
steps
prior
polymerization.
Under
conservative
scenario
(2.5%/yr),
would
more
than
4.75
GtCO2e
2050,
accounting
21-26%
keep
increases
1.5°C.
At
4%/yr
growth,
increase
times
6.78
GtCO2e,
25-31%
limiting
warming
Such
detailed
individual
polymers,
where
chain
stages
fully
taken
into
account,
can
provide
sound
technically
neutral
scientific
foundation
inform
treaty
enable
stronger
coordination
treaties
(e.g.,
United
Nations
Framework
Convention
Climate
(UNFCCC).
also
critical
understand
impacts
proposed
mitigation
measures
treaty,
most
either
polymer-specific
different
implications
per
polymer.
