Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 22, 2024
Abstract
Polymer
adsorbents
functionalized
with
amidoxime
groups
are
widely
considered
to
have
the
most
industrial
potential
for
uranium
extraction
from
seawater.
However,
entanglement
upon
collapse
of
polymer
chain
in
seawater
greatly
reduces
utilization
ratio
ligands.
Herein,
a
novel
star‐shaped
molecular
brush
adsorbent
(
β
‐CD‐
g
‐PAO)
is
obtained
by
densely
grafting
polyamidoxime
(PAO)
chains
‐cyclodextrin
‐CD).
Experimental
and
theoretical
results
reveal
that,
contrast
conventional
linear
adsorbents,
star
high
density
PAO
side
enables
strong
steric
repulsion
between
chains,
leading
increased
persistence
length
disentanglement
chains.
As
result,
shows
higher
accessibility
adsorption
ligands
lower
energy,
achieving
an
capacity
up
944.75
mg
−1
uranium‐spiked
seawater,
surpassing
that
3.2
times.
Remarkably,
this
demonstrates
extraordinarily
10.9
only
1
day
natural
coupled
excellent
affinity
uranyl
ions
K
=
0.31
pM).
The
unique
topological
structure
design
provides
new
approach
solving
problem
low
functional
adsorbents.
Carbon Research,
Journal Year:
2023,
Volume and Issue:
2(1)
Published: Feb. 9, 2023
Abstract
With
the
fast
development
of
agriculture,
industrialization
and
urbanization,
large
amounts
different
(in)organic
pollutants
are
inevitably
discharged
into
ecosystems.
The
efficient
decontamination
contaminants
is
crucial
to
human
health
ecosystem
pollution
remediation.
Covalent
organic
frameworks
(COFs)
metal–organic
(MOFs)
have
attracted
multidisciplinary
research
interests
because
their
outstanding
physicochemical
properties
like
high
stability,
surface
areas,
sorption
capacity
or
catalytic
activity.
In
this
review,
we
summarized
recent
works
about
elimination/extraction
pollutants,
heavy
metal
ions,
radionuclides
by
MOFs
COFs
nanomaterials
through
sorption-catalytic
degradation
for
chemicals
reduction-precipitation-extraction
metals
radionuclides.
interactions
between
COFs/MOFs
at
molecular
level
were
discussed
from
density
functional
theory
calculation
spectroscopy
analysis.
was
mainly
dominated
electrostatic
attraction,
π-π
interaction,
complexation
H-bonding
whereas
ions
attributed
complexation,
ion
exchange,
reduction
incorporation
reactions.
porous
structures,
groups,
active
sites
important
ability
selectivity.
doping
co-doping
metal/nonmetal,
with
other
materials
could
change
visible
light
harvest
generation/separation
electrons/holes
(e
−
/h
+
)
pairs,
thereby
enhanced
photocatalytic
challenges
possible
application
in
elimination
water
described
end.
Critical Reviews in Environmental Science and Technology,
Journal Year:
2023,
Volume and Issue:
53(13), P. 1289 - 1309
Published: Jan. 23, 2023
Advanced
porous
nanomaterials
such
as
metal-organic
frameworks
(MOFs),
covalent
organic
(COFs),
and
aromatic
(PAFs)
with
high
specific
surface
areas,
abundant
functional
groups,
accessible
pore
structures,
tunable
sizes,
easy
modification
are
attractive
adsorbents
for
the
capture
of
toxic
heavy
metal
ions,
pollutants,
radionuclides
from
aqueous
solutions.
This
review
first
comprehensively
introduces
properties
MOFs,
COFs,
PAFs
to
highlight
their
advantages
adsorbents.
Subsequently,
recent
progress
superior
efficient
removal
environmental
pollutants
is
summarized.
Furthermore,
influences
conditions
information
about
interaction
mechanisms
between
advanced
discussed.
Finally,
applications
promising
prospects
in
pollution
management
beneficial
designing
fabricating
materials,
which
also
provides
some
meaningful
guidance
studying
adsorption
materials
pollutants.
Biochar,
Journal Year:
2023,
Volume and Issue:
5(1)
Published: July 20, 2023
Abstract
Biochar
and
biochar-based
materials
have
been
studied
extensively
in
multidisciplinary
areas
because
of
their
outstanding
physicochemical
properties.
In
this
review
article,
biochar
the
removal
environmental
pollutants,
hydrogen
generation
carbon
dioxide
capture
were
summarized
compared.
The
interaction
mechanisms
discussed
from
experimental
results
characterization
analysis.
high
porous
structures,
active
surface
sites,
(co)doping
single
metals/nonmetals,
incorporation
metal
oxides
or
other
improved
activity
applications.
However,
there
are
still
some
challenges
such
as:
(1)
fact
that
H
2
with
selectivity
produced
syngas
to
meet
real
application
requirement
industrial
is
main
challenge
production;
(2)
selective
CO
stability,
adsorption
capacity
recyclability
at
low-cost
should
be
considered
focused
on;
(3)
sorption-(photo)degradation
organic
chemicals;
(4)
sorption-reduction-extraction/solidification
metals/radionuclides
efficient
methods
for
elimination
pollutants.
end,
perspectives,
possible
techniques
materials’
future
described.
Graphical
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
34(1)
Published: Sept. 21, 2023
Abstract
Adsorption‐photocatalysis
technology
based
on
covalent
organic
frameworks
(COFs)
offers
an
alternative
method
for
advancing
the
field
of
uranium
extraction
from
seawater.
When
determining
photocatalytic
activity
COFs,
binding
energy
excitons
(
E
b
)
functions
is
decisive
factor.
Nevertheless,
majority
reported
COFs
have
a
large
,
which
seriously
restricts
their
application
in
photocatalysis.
Using
practical
π‐skeleton
engineering
strategy,
current
study
synthesizes
three
donor‐acceptor
olefin‐linked
containing
amidoxime
units
effort
to
minimize
.
Theoretical
and
experimental
results
reveal
that
construction
planar
continuous
π
‐electron
delocalization
channels
can
significantly
reduce
promote
separation
electron‐hole
pairs,
thereby
enhancing
activities.
Moreover,
TTh‐COF‐AO
with
‐skeleton
donor
reduced,
exhibits
substantially
smaller
(38.4
meV).
Under
visible
light
irradiation,
high
photo‐enhanced
capacity
10.24
mg
g
−1
achieved
natural
seawater
without
addition
sacrificial
reagents,
superior
been
date.
This
study,
therefore,
paves
way
development
tailored,
efficient
photocatalysts
Environmental Functional Materials,
Journal Year:
2023,
Volume and Issue:
2(1), P. 76 - 92
Published: March 1, 2023
Large
amounts
of
various
(in)organic
pollutants
and
CO2
are
released
into
the
environment
with
fast
development
agriculture
industry,
which
results
in
environmental
pollution
climate
change,
thereby
causes
great
threat
to
human
society.
The
efficient
capture
conversion
critical
against
greenhouse
effect,
whereas
elimination
from
is
important
health
ecosystem.
COFs
(covalent
organic
frameworks)
have
attracted
multidisciplinary
research
interests
because
their
outstanding
physicochemical
properties
such
as
high
surface
areas,
tunable
porous
structures,
abundant
active
sites
functional
groups.
Herein
application
conversion,
sorption-photocatalytic
degradation
pollutants,
sorption-catalytic
reduction-solidification
heavy
metals/radionuclides
were
reviewed
compared.
interaction
mechanisms
pollutant
molecules
discussed
macroscopic
sorption
results,
microscopic
spectroscopy
analysis,
theoretical
calculations.
adsorption
capacity
was
mainly
related
groups
sites,
photocatalytic
activity
dominated
by
•O2−
•OH
species.
exhibited
catalytic
removal
pollutants.
However,
there
still
some
main
challenges
real
applications:
1)
selective
low
cost
reusability;
2)
visible
light
absorption
for
molecule
degradation;
3)
target
selectivity
4)
reduction
ability
in-situ
solidification
under
complex
conditions;
5)
extraction
radionuclides
complicated
solutions
seawater
or
salt
lake.
In
end,
perspectives
difficulties
applications
described.
