Publikacje

Abstract:

Three hydrocarbons (benzene, toluene, and p-xylene) and methylene were subjected to sorption on
natural and homoionic forms of three bentonites of different origin (SWy–2, Stx–1b, and bentonite
from Slovakia). The obtained results analysis shows that the bentonites saturated with polyvalent
cations Ca2+lub Fe3+ manifest the best sorption properties. The sorption of p-xylene was the sole exception
to this rule, occurring most efficiently on potassium forms. The sorption ability of a natural bentonite
toward a given sorbate can be predicted by means of a logarithmic function of plasticity limit,
representing the water content at which clay loses its plastic properties. Using a linear function of
plasticity limit of bentonite natural form (i.e., before the modification), it is possible to predict its sorption
ability after cation exchange. The relative error of the prediction in wide range of concentrations
was between 0.09% for sorption of p-xylene on K-form and 10.4% for sorption of toluene on natural
bentonite. The method permits a preliminary a priori assessment of the sorption properties after a
possible clay modification.

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Predicting bentonite sorption properties toward selected hydrocarbons based on certain physical properties