Efficient
pretreatment
is
crucial
for
valorization
of
biomasses.
However,
severer
conditions
and
high
energy
consumption
hindered
their
practical
application.
This
work
developed
a
photocatalytic
method
assisted
by
both
ZnIn2S4
catalysis
lignin
autocatalysis
at
mild
conditions.
The
achieved
removal
rate
(71.6%)
cellulose
yield
(94.8%)
in
hemp
fibers,
decreasing
the
major
content
β-O-4
bond
β-β
from
32.0%
to
10.7%
6.8%
3.4%,
respectively.
result
was
attributed
synergistic
action
lignin,
which
reduced
recombination
h+
photoelectron,
producing
more
•O2−
radicals
than
single
or
ZnIn2S4.
Furthermore,
produced
ZnIn2S4,
oxidized
structure
together
with
•O2−.
pretreated
fibers
possessed
excellent
breaking
strength
(4.46
cN/dtex)
fineness
(6.83
dtex).
Moreover,
fibres
were
readily
hydrolyzed
cellulase,
improving
glucose
concentration
58.3%
compared
alkaline
pretreatment.
Overall,
this
explored
potential
photocatalysis
biomasses,
discovered
autocatalysis.
Advanced Energy Materials,
Год журнала:
2023,
Номер
13(21)
Опубликована: Апрель 7, 2023
Abstract
Biomass,
a
naturally
abundant,
sustainable
and
clean
resource
has
great
potential
as
an
alternative
to
replace
the
limited
fossil
feedstock
for
value‐added
chemicals
fuels.
Biomass
with
abundant
reductive
functional
groups
could
theoretically
act
electron
donor
consume
photogenerated
holes
and/or
active
free
radicals.
photoreforming
over
semiconductor
photocatalysts
using
solar
light
energy
input
attracts
much
attention
in
this
context.
However,
biomass
still
suffers
low
conversion
efficiency
product
selectivity
due
its
structural
complexity,
poor
solubility
unclear
reaction
mechanism.
Owing
advanced
features
of
mass
diffusion
derivatives
adjustable
surface
properties,
hierarchically
porous
desired
sites
at
each
length
scale
porosity
have
shown
their
superiority
boosting
photoreforming.
Herein,
critical
review
is
presented
on
selective
simultaneous
H
2
co‐production
photocatalysts.
The
fundamentals
current
bottleneck
valorization
by
photocatalytic
process
are
analyzed.
rational
photocatalyst
design
structure
improve
transfer
highlighted.
Finally
challenges
opportunities
perspective
ssection.
