Materials,
Journal Year:
2023,
Volume and Issue:
16(12), P. 4285 - 4285
Published: June 9, 2023
The
aim
of
the
study
was
to
prepare
effective
low-cost
green
adsorbents
based
on
spent
black
tea
leaves
for
removal
nitrate
ions
from
aqueous
solutions.
These
were
obtained
either
by
thermally
treating
produce
biochar
(UBT-TT),
or
employing
untreated
waste
(UBT)
obtain
convenient
bio-sorbents.
characterized
before
and
after
adsorption
Scanning
Electron
Microscopy
(SEM),
Energy
Dispersed
X-ray
analysis
(EDX),
Infrared
Spectroscopy
(FTIR),
Thermal
Gravimetric
Analysis
(TGA).
experimental
conditions,
such
as
pH,
temperature,
concentration
studied
evaluate
interaction
nitrates
with
potential
synthetic
Langmuir,
Freundlich
Temkin
isotherms
applied
derive
parameters
data.
maximum
intakes
UBT
UBT-TT
59.44
mg/g
61.425
mg/g,
respectively.
data
this
best
fitted
isotherm
equilibrium
(the
values
R2
=
0.9431
0.9414
UBT-TT),
assuming
multi-layer
onto
a
surface
finite
number
sites.
model
could
explain
mechanism.
results
indicated
that
serve
novel
biowaste
materials
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(17)
Published: March 1, 2024
Abstract
Traditional
H
2
O
cleavage
mediated
by
macroscopic
electron
transfer
(MET)
not
only
has
low
utilization
of
,
but
also
sacrifices
the
stability
catalysts.
We
present
a
non‐redox
hydroxyl‐enriched
spinel
(CuFe
4
)
catalyst
with
dual
Lewis
acid
sites
to
realize
homolytic
.
The
results
systematic
experiments,
in
situ
characterizations,
and
theoretical
calculations
confirm
that
tetrahedral
Cu
optimal
acidity
strong
delocalization
can
synergistically
elongate
O−O
bonds
(1.47
Å
→
1.87
Å)
collaboration
adjacent
bridging
hydroxyl
(another
site).
As
result,
free
energy
is
decreased
(1.28
eV
0.98
eV).
be
efficiently
split
into
⋅OH
induced
CuFe
without
MET,
which
greatly
improves
(65.2
%,
nearly
times
than
traditional
catalysts).
system
assembled
affords
exceptional
performance
for
organic
pollutant
elimination.
scale‐up
experiment
using
continuous
flow
reactor
realizes
long‐term
(up
600
mL),
confirming
tremendous
potential
practical
applications.
