DBPapers
DOI: 10.5593/sgem2012/s04.v2001

ACTIVATION OF NATURAL BENTONITE FROM THE SLOVAK DEPOSIT

T. SCHUTZ, A. MOCKOVCIAKOVA, Z. OROLINOVA, A. ZORKOVSKA, P. HUDEC
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 2, 357 - 364 pp

ABSTRACT

The monoionic chemical activations of bentonite with the aim to improve its sorption
properties were carried. For the chemical activation, the double transformation based on
ion exchange was accomplished. In the first stage the as-received bentonite with the
most amount of calcium cations in the interlayer space was modified by the saturation
with sodium salt. The obtained natrified bentonite was then saturated with calcium
cations. The surface parameters of the as-received and activated bentonites were
determined by low temperature nitrogen adsorption measurements. The structural
changes were characterized by X-ray diffraction analysis. The morphology of the
bentonites was observed by scanning electron microscopy. The methylene blue method
was used to determine the cation exchange capacity. The zeta potential measurement
showed the negative surface charge of the investigated samples. To compare the
sorption properties of the activated samples, batch equilibrium experiments were done.
The sorption of cadmium cations was studied in the initial concentration range from 10
to 700 mg/l. Both activated samples showed higher maximal adsorption capacity of
sorption of Cd2+ cations than as-received bentonite.

Keywords: bentonite, activation, characterization, sorption

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