Determination and comparison of competitive isotherms by rectangular pulse method and frontal velocity analysis...

Area of Science:

• Analytical Chemistry
• Chromatography
• Surface Science

Background:

• Competitive adsorption phenomena are crucial in various chemical processes.
• Understanding adsorption behavior on stationary phases like ODS-silica is essential for separation science.
• Accurate determination of competitive isotherms is key to optimizing chromatographic separations.

Purpose of the Study:

• To compare the efficacy of the rectangular pulse method and a novel frontal velocity analysis method for determining competitive isotherms.
• To evaluate the applicability of the competitive-Langmuir isotherm equation to experimental data.
• To establish the frontal velocity analysis method as a viable alternative for binary competitive isotherm determination.

Main Methods:

• Application of the rectangular pulse method for competitive isotherm determination.
• Implementation of the frontal velocity analysis method for competitive isotherm determination.
• Analysis of experimental data using the competitive-Langmuir isotherm equation.

Main Results:

• Experimental data from both methods showed good agreement with the competitive-Langmuir isotherm equation.
• Coefficients obtained for competitive isotherms were comparable between the two methods.
• The frontal velocity analysis method demonstrated good agreement with the established rectangular pulse method.

Conclusions:

• The frontal velocity analysis method is a reliable and simpler approach for determining binary competitive isotherms.
• Both methods confirm the applicability of the competitive-Langmuir isotherm model for the studied systems.
• The frontal velocity analysis method provides a more accessible route for characterizing competitive adsorption on ODS-silica.