Résumé:
Heat
pretreatment,
steam
activation
and
20%
phosphoric
acid
activation
were
found
to
enhance
the
adsorption
capacity
of
a desert
Salsola
V ermiculata
plant
species
significantly
relative
to
the
inactivated
plant
and
powdered
wood
carbon
600200
EX
694
as
obtained
from
Belgium.
The
batch
adsorption
experiments
resulted
in
a maximum
adsorption
capacity
determined
from
Langmuir
models
of
up
to
476
mg
/
g
for
acetic
acid,
238
mg
/
g
for
copper(II)
ions
and
144
mg
/
g for
nickel(II)
ions,
whereas
for
the
inactivated
plant
they
attained
values
of
53
mg
/
g,
65
mg
/
g and
18
mg
/
g,
respectively.
The
results
for
the
wood
carbon
were
65
mg
/
g for
acetic
acid,
45
mg
/
g for
copper(II)
ions
and
2.4
mg
/
g for
nickel(II)
ions.
The
Freundlich
model
was
found
to
provide
a better
description
of
copper(II)
ion
adsorption
onto
the
steam-
and
chemically-activated
plant,
whereas
nickel(II)
ion
adsorption
processes
followed
Langmuir
behaviour.
These
results
showed
that
the
activated
plant
could
prove
to
be
very
useful
in
removing
toxic
substances
from
wastewater.
