Adsorption experiments were carried out on each solid except
Alx(OH)y-Montm, whose adsorption abilitywas previously
proven to be very low, as seen above.
Results are shown in Figs. 6a and 6b. Under acidic conditions
(3at more neutral pH values (6adsorbed. This agrees with data from Lombi et al. (23), and
with other results obtained on carbon-based adsorbents and on
zerovalent iron (3, 33). TixHy-Montm was the least efficient matrix
in both cases. As for HFO, the results were similar to those
described by Wilkie and Hering (34).
For basic pH values (pH>10), the pillared clays were damaged
(changes in solutions colour and solids aspect) and arsenic
elimination from the aqueous phase decreased.
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