Scientific Reports,
Journal Year:
2023,
Volume and Issue:
13(1)
Published: Nov. 24, 2023
In
Earth's
atmosphere,
the
surface
tension
of
sub-micron
aerosol
particles
is
suspected
to
affect
their
efficiency
in
becoming
cloud
droplets.
But
this
quantity
cannot
be
measured
directly
and
inferred
from
chemical
compounds
present
aerosols.
Amphiphilic
surfactants
have
been
evidenced
aerosols
but
experimental
information
on
properties
mixtures
with
other
components
lacking.
This
work
explores
experimentally
aqueous
amphiphilic
(SDS,
Brij35,
TritonX100,
TritonX114,
CTAC)
inorganic
salts
(NaCl,
(NH4)2SO4)
soluble
organic
acids
(oxalic
glutaric
acid)
using
pendant
droplet
tensiometry.
Contrary
what
could
expected,
systematically
enhanced
rather
than
reduced
it,
by
further
lowering
and,
some
cases,
CMC.
Furthermore,
all
studied
were
strongly
non-ideal,
even
displaying
synergism,
thus
demonstrating
that
common
assumption
ideality
for
not
valid.
The
molecular
interactions
between
mixture
either
bulk
(salting
out),
mixed
monolayer
(synergy
tension)
or
micelles
CMC)
need
included
when
describing
such
mixtures.
Scientific Reports,
Journal Year:
2023,
Volume and Issue:
13(1)
Published: Oct. 30, 2023
Industrial
wastewater
treatment
generates
sludge
with
high
concentrations
of
metals
and
coagulants,
which
can
cause
environmental
problems.
This
study
developed
a
sequential
washing
metal
recovery
process
for
industrial
containing
>
4500
mg/kg
Cu
5000
Cr.
The
agent
was
formulated
by
mixing
glycolipid,
lipopeptide,
phospholipid
biosurfactants
from
Weissella
cibaria
PN3
Brevibacterium
casei
NK8
chelating
agent,
ethylenediaminetetraacetic
acid
(EDTA).
These
contained
various
functional
groups
capturing
metals.
optimized
formulation
the
central
composite
design
had
low
surface
tension
relatively
small
micelles.
Comparable
Cr
removal
efficiencies
37.8%
38.4%,
respectively,
were
obtained
after
shaking
sonication
at
1:4
solid-to-liquid
ratio.
zeta
potential
analysis
indicated
bonding
ions
on
biosurfactant
When
100
g/L
iron
oxide
nanoparticles
applied
to
without
pH
adjustment,
83%
100%
recovered.
In
addition,
X-ray
diffraction
absorption
spectroscopy
showed
oxidation
nanoparticles,
reduction
Cr(V)
less
toxic
Cr(III),
Cu.
recovered
could
be
further
recycled,
will
beneficial
circular
economy.
Scientific Reports,
Journal Year:
2023,
Volume and Issue:
13(1)
Published: Nov. 24, 2023
In
Earth's
atmosphere,
the
surface
tension
of
sub-micron
aerosol
particles
is
suspected
to
affect
their
efficiency
in
becoming
cloud
droplets.
But
this
quantity
cannot
be
measured
directly
and
inferred
from
chemical
compounds
present
aerosols.
Amphiphilic
surfactants
have
been
evidenced
aerosols
but
experimental
information
on
properties
mixtures
with
other
components
lacking.
This
work
explores
experimentally
aqueous
amphiphilic
(SDS,
Brij35,
TritonX100,
TritonX114,
CTAC)
inorganic
salts
(NaCl,
(NH4)2SO4)
soluble
organic
acids
(oxalic
glutaric
acid)
using
pendant
droplet
tensiometry.
Contrary
what
could
expected,
systematically
enhanced
rather
than
reduced
it,
by
further
lowering
and,
some
cases,
CMC.
Furthermore,
all
studied
were
strongly
non-ideal,
even
displaying
synergism,
thus
demonstrating
that
common
assumption
ideality
for
not
valid.
The
molecular
interactions
between
mixture
either
bulk
(salting
out),
mixed
monolayer
(synergy
tension)
or
micelles
CMC)
need
included
when
describing
such
mixtures.
