Adsorption of oxalic acid on activated charcoal; the Langmuir and freundlich adsorption isotherms

Abstract

The aim of this research is to demonstrate the experiment of oxalic acid on activated charcoal prepared from eggshells and eggshell membranes, in a medium of aqueous solution and the determination of either the Langmuir or Freundlich adsorption isotherms. The current report enhances the study of adsorption, chemisorption and physisorption. Different samples of oxalic acid were prepared and different masses of activated charcoal from eggshells and eggshell membranes was added and left on an electric shaker for about an hour until equilibrium was attained. Furthermore, the samples were filtered and then titrated against standard sodium hydroxide solution in order to deduce the concentration. Using the given equations related to the experiment, a graph of 1/Qe vs 1/Ce in which the slope is 244.1 indicating that the Langmuir isotherm was determined and hence adsorption was monolayer. Hence activated charcoal from chicken eggshells acted as a good adsorbent for the removal of oxalic acid in wastewater.