Model Modification of Binary Competitive Isotherm

Abstract

Frontal analysis (FA) has enabled the experimental determination of the binary isotherms for 2-phenylethanol and 3-phenylpropanol using an octadecylsilane (ODS) bonded liquid chromatographic column. Existing models were applied and others developed to determine which provided the most accurate prediction of the binary isotherms. The competitive Langmuir was the basic model initially applied for fitting. The results indicated that this classical model provided large relative errors at the upper concentration limit of the range used in these studies. Further improvement of the competitive Langmiur model for predicting adsorption data was obtained using a modified Freundlich equation and the multicomponent Sips equation. Among these three isotherm models, the modified Freundlich equation could be successfully used as an accurate modeling technique through the entire experimental concentration range studied.

Keywords:

• Adsorption equilibria
• Competitive Langmuir
• Freundlich-Langmuir model
• Frontal analysis
• Isotherm modeling
• Model modification

ACKNOWLEDGMENT

This work was supported financially by of the National Innovative Fund for the Middle and Small Enterprise (No. 03C26212100852) of China.