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.
Sorption of non-ionic organic pollutants onto immobilized humic acid
IOVINO, Pasquale;SALVESTRINI, Stefano;Capasso S.
2015
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.