Equilibrium, Adsorption Isotherm and Kinetic Studies on the Removal of Methylene Blue Dye from Aqueous Solution onto Senna Occidentalis Seeds Activated Carbon

Abstract

This paper studied the adsorption potentials and efficiency of low cost activated carbon produced from Senna occidentalis seeds for the removal of Methylene Blue dye in aqueous solutions.Batch adsorption experiments were carried out to investigate the effects of variables such as initial dye concentration, carbon dosage, contact time, pH and temperature to the process.Similarly, adsorption isotherms consisting Langmuir, Freundlich and Temkin were employed and found Langmuir Adsorption model fitted best.However, Kinetic models consisting pseudo first-order, pseudo second-order and intra-particle diffusion were also used to investigate the kinetic nature of the process, and found that pseudo second-order model better explained the process.