Application of GAC for the Removal of Heavy Metal Ions From Aqueous Solution

Abstract: Granular Activated Carbon (GAC) has received widespread attention as an adsorbent for pollutants because of its low cost and great adsorption potentials. GAC has abundant that can bind heavy metal ions. However, in this research article we also studied on sensitivity to pH, Concentration, adsorbent dosage , which limit the application of GAC in aqueous solution. The porosity and specific surface area of GAC has been improved by medication of GAC by some oxidizing agents. Several kinetic models have been investigated to recognize the metal ions adsorption mechanism onto GAC. The results showed that the adsorption process obeyed the pseudo-second-order and intra-particle diffusion kinetic models, pointing that the adsorption mechanism is chemical and physical adsorption process. Langmuir and Freundlich adsorption isotherms have been investigated. The thermodynamic parameters have been studied, and it proved that, adsorption of Metal using GAC is endothermic. This study convinced that the naturally GAC proved to be an alternative, attractive, effective, economic, and environmentally friendly adsorbent for Metal removal from aqueous solution.