Molecules,
Journal Year:
2024,
Volume and Issue:
29(11), P. 2665 - 2665
Published: June 4, 2024
The
discharge
of
lead
and
cadmium
wastewater,
along
with
the
pollution
caused
by
phosphogypsum,
represents
a
particularly
urgent
environmental
issue.
This
study
employed
straightforward
hydrothermal
method
to
convert
phosphogypsum
into
porous
calcium
silicate
hydrate
(P-CSH),
which
was
then
used
remove
recover
Pb(II)
Cd(II)
from
wastewater.
adsorption
capacities
P-CSH
for
were
notably
high
at
989.3
mg/g
290.3
mg/g,
respectively.
processes
adhered
pseudo-second-order
kinetics
model
Langmuir
isotherm
model.
Due
identical
sites
on
both
Cd(II),
competitive
interaction
occurred
when
ions
present
simultaneously.
Additionally,
efficacy
minimally
impacted
presence
common
coexisting
cations
in
dominant
mechanisms
removing
via
chemical
precipitation
surface
complexation.
Moreover,
adsorbed
heavy
metals
efficiently
separated
reclaimed
wastewater
through
stepwise
desorption
process.
primary
components
residue
quartz
amorphous
SiO2.
Following
dissolution
pressurized
alkaline
leaching,
this
could
be
recycled
synthesizing
P-CSH.
research
offered
new
strategy
resourceful
use
metal
ACS ES&T Engineering,
Journal Year:
2024,
Volume and Issue:
4(8), P. 2054 - 2067
Published: July 16, 2024
Herein,
a
ball-milled
composite
mineral
derived
from
shell
powder
and
phosphate
rock
(BSPR)
was
innovatively
coupled
with
smooth
vetch
(SV)
planting
to
remediate
Cd-polluted
soil.
The
results
showed
that
BSPR
SV
could
reduce
the
bioavailability
of
Cd
in
soil
by
68.1%,
which
2.2
3.4
times
those
(31.1%)
(20.0%)
alone,
respectively.
outstanding
passivation
performance
confirmed
be
due
synergistic
effect
SV.
Specifically,
employment
not
only
increased
biomass
but
also
promoted
its
decomposition,
directly
led
conversion
into
more
humic
acid
(HA).
Under
action
HA,
calcium
phosphorus
were
released
combined
form
stable
compounds
(e.g.,
Cd3(PO4)2,
Cd5(PO4)3Cl,
CdnCa5–n(PO4)3OH).
Amazingly,
excellent
synergetic
on
improvement,
content
pepper
fruit
decreased
38.2%
(6.3
SV),
fresh
weight
Ca
enhanced
28.2%
43.4%
(6.7
22.8
SV,
respectively).
Overall,
this
study
provided
novel
strategy,
i.e.,
green
manure
mineral,
for
simultaneous
remediation
Cd-contaminated
farmland
enhancement
pepper's
yield
quality,
thus
achieving
"killing
three
birds
one
stone".
Currently,
the
cement
industry
stands
as
one
of
sectors
with
most
significant
environmental
impact,
primarily
due
to
its
substantial
greenhouse
gas
emissions
and
energy
consumption.
To
mitigate
this
a
roadmap
has
been
followed
in
recent
years,
outlining
set
objectives
aimed
at
diminishing
footprint
construction
industry.
This
research
focuses
on
development
mortars
different
water/cement
ratio
employing
an
alternative
cement,
specifically
magnesium
phosphate
(MPC)
formulated
secondary
sources.
The
goal
relays
developing
based
MPC
by
using
waste
from
metallurgical
industry,
named
tundish
deskulling
(TUN),
MgO
source.
results
revealed
optimal
(W/C)
for
MPC-TUN
production
through
assessment
various
characterisation
techniques,
which
was
0.55.
Furthermore,
it
demonstrated
effectiveness
aluminium
sulphate
preventing
efflorescences
caused
carbonates.
represents
stride
towards
advancing
principles
circular
economy,
alignment
laid
out
2030
roadmap.
