Abstract
Sorption isotherms from water solution onto immobilized humic acid have been determined at 4, 14, 24, and 34°C for toluene, cyclohexane, o-xylene, benzyl alcohol, phenol, and cyclohexanol. The experimental data were well described by the Freundlich sorption equation. The higher values of K constant were obtained for the two aromatic hydrocarbon compounds, toluene (924 mmoln−1Lnkg−1) and o-xylene (1,350 mmoln−1Lnkg−1). The isosteric sorption enthalpy (ΔistH) and the standard enthalpy were negative for all compounds analyzed, and the absolute values of ΔistH decreased with increasing sorbate loading. Comparisons with data for a humic acid-zeolitic tuff adduct supports the conclusion that the sorption properties of combined materials may not be the sum of the components, thus strengthening the rationale for research of novel adducts.
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