Materials,
Journal Year:
2024,
Volume and Issue:
17(13), P. 3078 - 3078
Published: June 22, 2024
Spent
coffee
grounds
(SCGs)
have
great
potential
as
a
useful,
value-added
biological
material.
In
this
context,
activated
carbon
(AC)
was
prepared
from
SCGs
by
an
activation
process
using
H3PO4
at
600
°C
in
the
air
and
used
adsorbent
for
azo
dye
AO7,
model
molecule
colorants
found
textile
industry
effluents.
X-ray
diffraction,
SEM
BET
revealed
that
AC
predominantly
amorphous,
consisting
of
powder
20–100
µm
particles
with
mesopores
averaging
5.5
nm
pore
size.
Adsorption
kinetics
followed
pseudo-second-order
law,
while
Langmuir
best
fitted
experimental
isotherm
data
(maximum
capacity
119.5
mg
AO7
per
g).
The
thermodynamic
parameters
adsorption
endothermic
spontaneous.
All
characterizations
indicated
occurred
physisorption
via
mainly
π–π
interactions.
removal
efficiency
optimized
means
Box–Behnken
design
response
surface
methodology
98%
initial
concentration
20
mg·L−1
pH
7.5
dose
0.285
g·L−1
contact
time
40
min.
These
results
clearly
show
can
be
useful
material
efficiently
removing
organic
matter
aqueous
solutions.
Spent
coffee
grounds
(SCG)
have
great
potential
as
a
useful,
value-added
biological
material.
In
this
context,
activated
carbon
(AC)
was
prepared
from
SCG
by
an
activation
process
using
H3PO4
at
600°C
in
air
and
used
adsorbent
for
the
azo
dye
AO7,
model
molecule
colorants
found
textile
industry
effluents.
X-ray
diffraction,
SEM
BET
revealed
that
AC
predominantly
amorphous,
consisting
of
powder
20-100
µm
particles
with
mesopores
averaging
5.5
nm
pore
size.
Adsorption
kinetics
followed
pseudo-second-order
law,
while
Langmuir
best
fitted
experimental
isotherm
data
(maximum
capacity
119.5
mg
AO7
per
g).
Thermodynamic
parameters
adsorption
endothermic
spontaneous.
All
characterizations
indicated
occurred
physisorption
via
mainly
-
interactions.
The
removal
efficiency
optimized
means
Box-Behnken
design
response
surface
methodology
98%
initial
concentration
20
mg.L-1
pH
7.5
dose
0.285
g.L-1
contact
time
40
min.
These
results
clearly
show
can
be
useful
material
efficiently
removing
organic
matter
aqueous
solutions.
Molecules,
Journal Year:
2025,
Volume and Issue:
30(4), P. 881 - 881
Published: Feb. 14, 2025
The
tremendous
increase
in
agro-industrial
waste
poses
major
environmental
problems
and
highlights
the
need
for
innovative,
sustainable
solutions.
One
promising
solution
would
be
converting
these
organic
wastes,
such
as
unvalued
pineapple
peels
(ANA)
brewer's
grains
(ECB),
into
activated
carbons
to
meet
impending
challenge
of
wastewater
treatment.
In
particular,
Acid
Orange
7
(AO7)
is
one
most
widely
used
synthetic
dyes,
a
significant
portion
which
ends
up
water,
posing
health
with
limiting
decentralized
cost-effective
To
address
two
challenges,
we
investigated
best
conditions
wastes
alternative
(named
CA-ANA
CA-ECB)
AO7
dye
removal
under
representative
adsorption
conditions.
Extensive
characterization
(SEM,
EDX,
XRD,
BET)
revealed
an
amorphous,
mesoporous
structure
specific
surface
areas
1150-1630
m2
g-1,
outperforming
majority
other
biomass-derived
reported
removal.
Adsorption
followed
pseudo-second-order
kinetics
Langmuir
isotherm,
record
efficiencies
90-99%
concentrations
25-35
mg
L-1
batch
reactor,
driving
forces
being
electrostatic
attraction,
π-π
interactions,
hydrogen
bonding.
These
results
undoubtedly
highlight
potential
current
waste-derived
solutions
efficient
Journal of Antimicrobial Chemotherapy,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 13, 2025
Abstract
Objectives
To
evaluate
the
in
vitro
and
vivo
antimicrobial
activity
of
pleuromutilin
derivatives
modified
with
C14
side-chain
against
Streptococcus
suis.
Methods
determine
minimum
inhibitory
concentrations
(MICs)
268
modifications
S.
suis
ATCC
43
765
using
broth
dilution
method.
Derivative
B43,
B49,
B52,
B53
B54,
which
exhibited
better
activity,
were
selected
for
further
investigation
their
antibacterial
effect,
cytotoxicity,
effect.
Results
Determination
five
clinical
strains
(n
=
37),
as
well
growth
time-killing
curves.
Those
experiments
showed
that
all
had
good
vitro.
Resistance-inducing
assays
demonstrated
that,
except
similar
abilities
to
induce
resistance
tiamulin.
In
addition,
did
not
have
erythrocyte
haemolytic
toxicity
(0.25–16
mg/L)
cytotoxicity
(1.25–80
mg/L).
mouse
thigh
infection
model,
derivative
B49
superior
efficacy.
About
40
mg/kg
improved
survival
rate
mice
by
33.3%
peritonitis
model.
Molecular
docking
study
scanning
electron
microscopy
revealed
can
effectively
bind
active
site
50S
ribosome
disrupt
cell
membranes.
Conclusions
A
total
68.66%
potent
Among
them,
effects
suis,
indicating
be
intensively
studied
an
candidate
compound.
