Abstract
This study presents the equilibrium and thermodynamic parameters of the adsorption of stearic acid on sepiolite as a function of temperature. The equilibrium data were applied to linear Langmuir and Freundlich models and the coefficients of determination (r2 = 0.849-0.935 for linear Langmuir model and r2 = 0.990-0.995 for linear Feundlich model), indicating that the second model was more applicable in the evaluation of equilibrium data at studied conditions. Thermodynamic parameters such as free energy (ΔG°), enthalpy (ΔH°) and entropy of adsorption (ΔS°) were also calculated. These parameters revealed that the adsorption of stearic acid on sepiolite was feasible, spontaneous and exothermic in nature. On the basis of the results, it can be concluded that the sepiolite has a considerable potential for removal of stearic acid from the main sources such as raw and edible soybean, sunflower and olive oils.
| Original language | English |
|---|---|
| Pages (from-to) | 2099-2104 |
| Number of pages | 6 |
| Journal | Asian Journal of Chemistry |
| Volume | 20 |
| Issue number | 3 |
| State | Published - Mar 2008 |
| Externally published | Yes |
Bibliographical note
Funding Information:These studies were supported by grants from Ministero della Uni-versità e Ricerca Scientifica (quote 40 and 60%). Professor Natale De Santo of the 2nd University of Naples, Italy, and Professor Tullio Faraggiana of the University “La Sapienza” of Rome, Italy, provided helpful advice.
Funding Information:
These studies were supported by grants from Ministero della Universit? e Ricerca Scientifica (quote 40 and 60%). Professor Natale De Santo of the 2nd University of Naples, Italy, and Professor Tullio Faraggiana of the University "La Sapienza" of Rome, Italy, provided helpful advice.
Keywords
- Adsorption isotherm
- Sepiolite
- Stearic acid
- Thermodynamic parameters
ASJC Scopus subject areas
- General Chemistry