The adsorption of pentachlorophenol from aqueous solutions onto exchanged Al-MCM-41 materials
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Journal Title
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Publisher
Adsorption Science & Technology
Abstract
The
ability
of
a
mesoporo
us
molecular
sieve
to
adsorb
chlorinated
phenols
was
studied
experimentally.
Thus,
the
adsorption
isotherms
of
pentachloro
phenol
(PCP)
from
aqueous
solutions
were
measured
on
(M)Al-MCM-41
(M
= Na
+
, K
+
, Cu
2
+
, Cr
3
+
) at
intervals
of
10
K
between
303
K
and
323
K.
The
experimental
isotherms
obtained
were
of
the
S-type
in
terms
of
the
classification
of
Giles
and
co-workers.
The
best
fit
of
the
adsorption
isotherm
data
was
obtained
using
the
Freundlich
model.
The
adsorption
affinity
of
PCP
increased
in
the
order
(K)Al-MCM-41
<
(Cr)Al-MCM-41
<
(Na)Al-MCM-41
<
(Cu)Al-MCM-41.
At
the
same
temperature,
the
adsorption
of
PCP
on
(Cu)Al-
MCM-41
was
more
pronounced
compared
to
its
adsorption
on
alumina-pillared
montmorillonite
and
mesoporous
alumina
aluminium
phosphates.
Analysis
of
the
isosteric
curves
showed
that
(Cu)Al-MCM-41
and
(Na)Al-MCM-41
presented
a heterogeneous
profile.
In
contrast,
(K)Al-MCM-41
and
(Cr)Al-MCM-41
did
not
exhibit
energetic
heterogeneity
throughout
the
entire
range
of
coverage.