Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
583668 | Journal of Hazardous Materials | 2008 | 8 Pages |
Abstract
Thermodynamic parameters such as the standard free energy change (ÎG)°, enthalpy change (ÎH°) and entrophy change (ÎS°) were calculated to determine the nature of sorption process. From these parameters, ÎH° were found to be endothermic values: 38.39, 18.0, and 14.7 kJ molâ1 for the same sequence of divalent cations and ÎS° values were calculated to be positive for the sorption of each metal ion onto the modified silica gel. Negative ÎG° values indicated that sorption process for all metal ions were spontaneous in nature although they presented an endothermic enthalpy for the interaction, resulting in an entropically favoured process.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
I. Hatay, R. Gup, M. Ersöz,