Toxics,
Journal Year:
2024,
Volume and Issue:
12(1), P. 88 - 88
Published: Jan. 19, 2024
P-nitroaniline
(PNA)
is
an
aniline
compound
with
high
toxicity
and
can
cause
serious
harm
to
aquatic
animals
plants.
Multiwalled
carbon
nanotubes
(MWCNTs)
are
a
multifunctional
carbon-based
material
that
be
applied
in
energy
storage
biochemistry
applications
semiconductors
as
well
for
various
environmental
purposes.
In
the
present
study,
MWCNTs
(CO2–MWCNTs
KOH–MWCNTs)
were
obtained
through
CO2
KOH
activation.
ACID–MWCNTs
surface
treatment
H2SO4–HNO3
mixture.
Herein,
we
report,
first
time,
employed
nanoadsorbents
remove
PNA
from
aqueous
solution.
The
had
nanowire-like
features
different
tube
lengths.
nanotubular
structures
not
destroyed
after
being
activated.
KOH–MWCNTs,
CO2–MWCNTs,
areas
of
487,
484,
80
m2/g,
respectively,
pore
volumes
1.432,
1.321,
0.871
cm3/g,
respectively.
activated
contained
C–O
functional
groups,
which
facilitate
adsorption.
To
determine
maximum
adsorption
capacity
MWCNTs,
influences
several
factors—contact
solution
pH,
stirring
speed,
amount
adsorbent—on
investigated.
KOH–MWCNTs
highest
capacity,
followed
by
pristine
ACID–MWCNTs.
exhibited
rapid
(>85%
within
5
min)
(171.3
mg/g).
Adsorption
isotherms
kinetics
models
investigate
mechanism.
results
reutilization
experiments
revealed
retained
five
cycles.
surface-activated
modified
synthesized
this
study
effectively
hazardous
pollutants
wastewater
may
have
additional
uses.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(33)
Published: June 19, 2024
The
recovery
of
precious
metals
(PMs)
from
secondary
resources
has
garnered
significant
attention
due
to
environmental
and
economic
considerations.
Covalent
organic
frameworks
(COFs)
have
emerged
as
promising
adsorbents
for
this
purpose,
owing
their
tunable
pore
size,
facile
functionalization,
exceptional
chemical
stability,
large
specific
surface
area.
This
review
provides
an
overview
the
latest
research
progress
in
utilizing
COFs
recover
PMs.
Firstly,
design
synthesis
strategies
chemically
stable
COF-based
materials,
including
pristine
COFs,
functionalized
composites,
are
delineated.
Furthermore,
application
gold,
silver,
platinum
group
elements
is
delved
into,
emphasizing
high
adsorption
capacity
selectivity
well
recycling
ability.
Additionally,
various
interaction
mechanisms
between
PM
ions
analyzed.
Finally,
current
challenges
faced
by
field
discussed,
potential
directions
future
development
proposed,
enhancing
recyclability
reusability
COF
materials
realizing
PMs
actual
acidic
wastewater.
With
targeted
can
be
realized
more
economically
efficiently
future.
npj Clean Water,
Journal Year:
2024,
Volume and Issue:
7(1)
Published: April 15, 2024
Abstract
Macrolide
antibiotics,
including
erythromycin,
clarithromycin,
and
azithromycin,
are
frequently
misused
for
human
treatment
globally.
Therefore,
they
were
considered
high-risk
substances
on
the
Union-wide
monitoring
Watch
list
under
Regulation
2018/840/EU.
The
present
work
investigates
adsorption
behavior
of
pharmaceutical
pollutants
1,3,5-tris
(4-aminophenyl)
benzene/2,5
dimethoxyterephthalaldehyde
(TAPB-DMTP)
covalent
organic
frameworks
(COFs).
In
this
study,
we
employ
molecular
dynamics
simulations
well-tempered
metadynamics
to
evaluate
affinity
pristine
their
functionalized
form
(F-COFs)
removal
four
distinct
pollutant
molecules
(PPMs):
erythromycin
(EMC),
dexamethasone
(DEG),
azithromycin
(AZM),
clarithromycin
(CMC).
We
utilized
MD
examine
impact
two
different
temperatures
(298
310
K)
enhancing
contaminants
from
wastewater
by
COFs/F-COFs.
To
process,
several
descriptors
calculated
simulation
trajectories,
interaction
energies,
root-mean-square
deviation,
radial
distribution
function,
solvent-accessible
surface
area,
mean
square
displacement,
number
hydrogen
bonds
(HB).
It
is
determined
that
HB
X–H⋯π
(X
=
C,
N,
O;
π
aromatic
system)
interactions
most
critical
factors
contributing
system
stability.
addition,
it
shown
COFs
with
a
pore-based
structure
have
higher
capacity
removing
pollutants.
free
energy
landscapes
confirm
global
minimum
typically
associated
formation
bonds.
At
298
K,
minima
DEG/F-COFs
−665.81,
AZM/F-COFs
−638.53,
EMC/F-COFs
−566.31,
CMC/F-COFs
−326.75
KJ
mol
−1
.
