Adsorption Isotherms of Alkali Metal and Alkaline Earth Metal Ions on Multiwall Carbon Nanotube

Abstract

In this paper, adsorption isotherms of alkali metal and alkaline earth metal ions on multiwall carbon nanotubes were studied for three common adsorption isotherm models: Langmuir, Freundlich and Temkin. For each of these models determined different parameters for carbon nanotube adsorbent. The experimental results were fitted to the Langmuir, Freundlich and Temkin isotherms to obtain the characteristic parameters of each model. The Langmuir isotherm was found to well represent the measured sorption data for alkaline earth metal and both the Freundlich and Temkin isotherms were found to well represent the measured sorption data for alkali metal. According to the evaluation using the Langmuir equation, the maximum sorption capacities of metal ions onto multiwall carbon nanotube.