Sorption of non-ionic organic pollutants onto a humic acids-zeolitic tuff adduct: Thermodynamic aspects

Sorption isotherms from water solutions for toluene, cyclohexane, o-xylene, benzyl alcohol, phenol and cyclohexanol onto a humic acid-zeolite adduct were determined at 4, 14, 24 and 34 °C and utilized to calculate the isosteric enthalpy (ΔadsHi) and isosteric entropy (ΔadsSi) of the process. For hyd...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2014, Vol.95, p.75-80
Main Authors: LEONE, Vincenzo, IOVINO, Pasquale, SALVESTRINI, Stefano, CAPASSO, Sante
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Biological and physicochemical phenomena
Exact sciences and technology
Hazardous Substances - chemistry
Humic Substances
Models, Chemical
Natural water pollution
Pollution
Thermodynamics
Water Pollutants, Chemical - chemistry
Water treatment and pollution
Zeolites - chemistry
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Summary:Sorption isotherms from water solutions for toluene, cyclohexane, o-xylene, benzyl alcohol, phenol and cyclohexanol onto a humic acid-zeolite adduct were determined at 4, 14, 24 and 34 °C and utilized to calculate the isosteric enthalpy (ΔadsHi) and isosteric entropy (ΔadsSi) of the process. For hydrocarbon compounds, toluene, cyclohexane and o-xylene, both ΔadsHi and ΔadsSi were negative, the process was exothermic. In contrast, for hydroxyl compounds, benzyl alcohol, phenol and cyclohexanol, ΔadsHi and ΔadsSi were positive, the increase in entropy possibly reflecting the release of water molecules during sorption. The results suggest that sorption/desorption of either class of compounds could be controlled by operating on the temperature.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2013.08.019