Indonesian Journal of Chemistry,
Journal Year:
2023,
Volume and Issue:
23(6), P. 1584 - 1584
Published: Dec. 6, 2023
The
rapid
development
of
the
aquaculture
industry
has
contributed
to
high
amount
nutrients
in
wastewater
that
subsequently
led
eutrophication
and
deterioration
water
quality.
Aquaculture
consists
uneaten
fish
feed,
fecal
other
excretion
or
residue
chemicals
used.
Thus,
this
study
aimed
evaluate
performance
hybrid
coagulants
Moringa
oleifera
(MO)
copperas
for
treatment.
In
present
study,
different
formulations
MO
were
explored
coagulation
treatment
using
a
jar
test
experiment.
FTIR
SEM
analysis
are
used
determine
morphology
surface
MO.
This
focuses
on
effect
coagulant
aids
formulation,
dosage,
initial
pH
time
turbidity
ammonia
removal
wastewater.
finding
shows
highest
was
obtained
with
use
80%
20%
at
condition
6
20
min
time,
percentage
66%
91%,
respectively.
isotherm
80:20
is
well
described
Freundlich
model
which
describes
heterogeneity.
Environmental Science & Technology,
Journal Year:
2024,
Volume and Issue:
58(24), P. 10717 - 10728
Published: June 7, 2024
Ruthenium
single-atom
catalysts
have
great
potential
in
ammonia-selective
catalytic
oxidation
(NH3–SCO);
however,
the
stable
sp3
hybrid
orbital
of
NH3
molecules
makes
N(sp3)–H
dissociation
a
challenge
for
conventional
symmetrical
metallic
oxide
catalysts.
Herein,
we
propose
heterogeneous
interface
reverse
atom
capture
strategy
to
construct
Ru
with
unique
asymmetric
Ru1N2O1
coordination.
Ru1N2O1/CeO2
exhibits
intrinsic
low-temperature
conversion
(T100
at
160
°C)
compared
symmetric
coordinated
Ru-based
(280
°C),
Ir-based
(220
and
Pt-based
(200
catalysts,
TOF
is
65.4
times
that
Ag-based
The
experimental
theoretical
studies
show
there
strong
d–p
interaction
between
N
atoms,
which
not
only
enhances
adsorption
ammonia
position
but
also
optimizes
electronic
configuration
Ru.
Furthermore,
affinity
water
significantly
weaker
than
(the
binding
energy
Pd3Au1
catalyst
−1.19
eV,
it
−0.39
eV
our
material),
so
has
excellent
resistance.
Finally,
activation
requires
assistance
surface
reactive
oxygen
species,
found
can
directly
activate
bond
without
involvement
species.
This
study
provides
novel
principle
rational
design
proximal
coordination
active
sites
achieve
its
optimal
activity
catalysis.
Energy & Fuels,
Journal Year:
2024,
Volume and Issue:
38(22), P. 22440 - 22449
Published: Nov. 12, 2024
To
solve
the
problem
of
poor
low-temperature
NH3
selective
catalytic
oxidation
(NH3–SCO)
performance
CeZrOx
catalysts,
a
series
Ru/CeZrOx
catalysts
with
various
Ru
mass
ratios
were
prepared
via
impregnation–precipitation
method.
The
introduction
could
significantly
improve
from
activity
test
results.
Among
catalyst
ratio
0.5
wt
%
and
Ce/Zr
molar
7:3
(denoted
as
Ru0.5/CZO)
was
considered
to
have
an
excellent
NH3–SCO
performance;
conversion
reached
100
91.2%
N2
selectivity
at
237
°C.
Physicochemical
properties
Ru0.5/CZO
CZO
compared
through
characterization
tests
investigate
relationship
between
performance.
H2-TPR
results
revealed
interaction
Ce
species.
shifted
reduction
peak
toward
lower-temperature
direction,
enhancing
redox
catalyst.
NH3-TPD
indicated
that
had
abundant
acid
sites
on
its
surface,
facilitating
adsorption
oxidation.
In
situ
DRIFTS
reaction
mechanism
might
be
both
internal-selective
(i-SCR)
imine
(−NH)
mechanisms.
