Removing
crude
oil
from
spent
hydrodesulfurization
catalysts
is
the
first
step
for
recovery
of
catalysts,
while
traditional
roasting
method
suffers
a
lot
limitations.
In
this
study,
an
ultrasound-assisted
surfactant
cleaning
was
used
to
effectively
remove
and
surfactants
were
screened
by
experimental
theoretical
studies.
The
SDBS
TX-100
chosen
interfacial
tension
(IFT)
test,
their
frontier
orbitals,
electrostatic
potential,
polarity
calculated
analyzed,
showing
smallest
LUMO-HOMO
energy
band
gap
ΔE
4.91
eV
4.80
eV,
respectively,
with
highest
reactivity.
hydrophilic
structure
in
regulates
wettability
oil-water
interface,
long-chain
alkanes
have
excellent
nonpolar
properties
that
promote
dissolution
oil.
Surprisingly,
under
optimal
conditions,
residue
reduced
0.25%.
Finally,
techno-economic
evaluation
whole
process
analyzed.
Compared
process,
saves
$0.31
1
kg
catalyst,
simple
operate
no
emissions.
This
study
provides
new
insights
into
realization
efficient
removal
low-carbon
environmentally
friendly
way.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2022,
Номер
10(50), С. 16503 - 16515
Опубликована: Дек. 7, 2022
Low-molecular-weight
(LMW)
molecules
of
biological
origin
like
microbial
glycolipid
biosurfactants
can
self-assemble
in
water,
with
a
tunable
structure
by
soft
chemistry
approach
(pH,
temperature,
and
ionic
strength).
The
unique
molecular
glycolipids
gives
possible
access
to
wide
variety
aqueous
self-assembled
structures,
although
highly
unpredictable
beforehand.
presented
here
consists
glucose
group
linked
C18:1-cis
fatty
acid
(G-C18:1)
produced
the
fermentation
Starmerella
bombicola
ΔugtB1.
Due
carboxylic
acid,
supramolecular
self-assembly
is
pH
dependent.
In
range
5–7,
G-C18:1
forms
vesicles,
while
above
7,
it
micellar
phase.
Adding
metal
salts
(ion
radius
ascending
order:
Al3+,
Fe3+,
Ni2+,
Mg2+,
Cu2+,
Zn2+,
Co2+,
Fe2+,
Cr2+,
Mn2+,
Au3+,
Ca2+,
Ag+,
Sr2+,
Ba2+),
vesicle
phase
generally
precipitates.
Metal
complex
speciation
(Al3+,
Fe2+)
added
drive
formation
wormlike
gels,
often
observed
for
surfactants
water.
On
contrary,
free
ions
(Cr2+,
Ag+)
same
unexpectedly
hydrogels
fibrillar
structure,
amphiphiles
(peptides,
peptide-derivatives)
but
not
surfactants.
Oscillatory
rheology
shows
that
elastic
properties
vary
between
few
tens
Pa
up
5
kPa
given
glucolipid
concentration
(3
wt
%).
This
work
hence
first
example
preparing
metallogels
from
Soft Matter,
Год журнала:
2022,
Номер
19(3), С. 378 - 393
Опубликована: Дек. 23, 2022
Low-molecular
weight
gelators
(LMWGs)
are
small
molecules
(Mw
<
∼1
kDa),
which
form
self-assembled
fibrillar
network
(SAFiN)
hydrogels
in
water
when
triggered
by
an
external
stimulus.
A
great
majority
of
SAFiN
gels
involve
entangled
fibers,
analogy
to
a
polymer
good
solvent.
In
some
rare
cases,
combination
attractive
van
der
Waals
and
repulsive
electrostatic
forces
drives
the
formation
bundles
with
suprafibrillar
hexagonal
order.
this
work,
unexpected
micelle-to-fiber
transition
is
Ca2+
or
Ag+
ions
added
micellar
solution
novel
glycolipid
surfactant,
whereas
salt-induced
fibrillation
not
common
for
surfactants.
The
resulting
SAFiN,
forms
hydrogel
above
0.5
wt%,
has
"nano-fishnet"
structure,
characterized
fibrous
both
fibers
β-sheet-like
rafts,
generally
observed
silk
fibroin,
actin
mineral
imogolite
nanotubes,
but
known
SAFiNs.
raft
domains
cryo-TEM
SAXS
seem
contribute
stability
gels.
Furthermore,
obtained
fermentation
from
natural
resources
(glucose,
rapeseed
oil),
thus
showing
that
naturally
engineered
compounds
can
have
unprecedented
properties,
compared
wide
range
chemically
derived
amphiphiles.
Molecules,
Год журнала:
2024,
Номер
29(11), С. 2606 - 2606
Опубликована: Июнь 1, 2024
Biosurfactants
derived
from
microorganisms
have
attracted
widespread
attention
in
scientific
research
due
to
their
unique
surface
activity,
low
toxicity,
biodegradability,
antibacterial
properties,
and
stability
under
extreme
conditions.
are
widely
used
many
fields,
such
as
medicine,
agriculture,
environmental
protection.
Therefore,
this
review
aims
comprehensively
analyze
the
various
applications
of
biosurfactants
medical
field.
The
central
roles
crucial
areas
explored,
like
drug
delivery,
induction
tumor
cell
differentiation
or
death,
treating
bacterial
viral
effects,
healing
wounds,
immune
regulation.
Moreover,
a
new
outlook
is
introduced
on
optimizing
capabilities
through
modification
gene
recombination
for
better
use
medicine.
current
challenges
future
directions
described,
aiming
provide
valuable
insights
continuous
study
Rheology
control
of
biosurfactant-based
hydrogels
enables
precise
3D
printing
soft
scaffolds,
offering
a
sustainable
platform
for
structuring
matter
in
advanced
manufacturing
and
bioengineering.
Journal of Surfactants and Detergents,
Год журнала:
2022,
Номер
26(2), С. 175 - 184
Опубликована: Ноя. 8, 2022
Abstract
Water
pollution
by
heavy
metals
is
a
problem
in
both
western
and
developing
countries.
Heavy
metal
can
be
associated
with
human
activity,
such
as
wastewaters
from
processing
of
ore
mining,
but
also
to
simple
contamination
metal‐rich
soils.
Whichever
the
case,
chemical
physical
methods
are
generally
employed
depollute
water.
Since
most
chemicals
themselves
polluting
agents,
there
an
increasing
interest
finding
biobased
biodegradable
alternative
chemicals,
efficient
removing
benign
environment.
Biosurfactants
green
produced
fermentation
yeasts
bacteria
good
environmental
score.
Among
many
applications,
this
class
compounds
has
been
used
remove
contaminated
Within
framework,
we
propose
new
mechanism
depolluting
water
using
glucolipid
biosurfactant,
G‐C18:1,
composed
glucose
(G)
C18:1
fatty
acid
(oleic
acid).
This
compound
able
form
metallogel
complexing
cations
water,
thus
trapping
(Cu
2+
,
Ni
Cr
Co
)
gel
phase.
allows
up
95%
for
cobalt
88
±
10%,
80
3%,
59
6%
Cu
respectively.
A
dedicated
structural
study
shows
that
possible
because
positively
charged
species
induce
gelation
G‐C18:1
through
micelle‐to‐wormlike
phase
transition,
likely
driven
charge
neutralization
process.
work
wise
control
nanoscale
properties
strongly
benefit
develop
sustainable
future.
Biomacromolecules,
Год журнала:
2022,
Номер
24(1), С. 19 - 32
Опубликована: Дек. 27, 2022
Hydrogels
are
widespread
soft
materials,
which
can
be
used
in
a
wide
range
of
applications.
The
control
over
the
viscoelastic
properties
gel
is
paramount
importance.
Ongoing
environmental
issues
have
raised
consumer's
concern
toward
use
more
sustainable
including
hydrogels.
However,
greener
materials
compatible
with
high
functionality?
In
safe-by-design
approach,
this
work
demonstrates
that
functional
hydrogels
situ
responsivity
their
elastic
by
external
stimuli
developed
from
entirely
"sustainable"
components,
biobased
amphiphile
and
biopolymers
(gelatin,
chitosan,
alginate).
bioamphiphile
stimuli-responsive
glycolipid
obtained
microbial
fermentation,
self-assemble
into
fibers,
but
also
micelles
or
vesicles,
water
under
dilution
rapid
variation
stimuli.
bioamphiphile-/biopolymer-interpenetrated
modulated
selectively
triggering
phase
transition
and/or
biopolymer
inside
mean
temperature
pH.
Current Opinion in Colloid & Interface Science,
Год журнала:
2023,
Номер
69, С. 101768 - 101768
Опубликована: Ноя. 19, 2023
Surfactants
are
ubiquitous
in
formulated
products
and
technologies.
As
one
of
the
most
important
commodity
chemicals,
their
remarkable
consumption
leads
to
necessity
finding
sustainable
alternatives.
Although
use
renewable
sources
limits
available
chemical
space
for
a
"Green"
production,
great
variety
naturally
occurring
precursors,
i.a.,
fatty
acids
sugars,
opens
myriad
possibilities
create
biosurfactants
capable
replacing
fatigued
fossil-derived
amphiphiles.
Here,
we
visit
concept
isomer-directed
assembly
applied
sugar-based
surfactants,
wherein
amphiphile
function
fine-tuned
through
changes
stereochemical
regiochemical
configuration
molecule.
such,
show
how
isomerism
define
directional
interactions
solvation,
ultimately
dictating
surfactants.
However,
general
framework
understand
structure-function
relationship
these
is
still
missing,
which
key
realizing
this
divergent
set
tools
design
new
