Optimization of process parameters for the adsorption of nickel onto activated carbon using response surface methodology

Abstract

In the present study, the adsorption characteristics of Ni2+ onto activated carbon produced from the biomass residue Citrullus colocynthis peel was studied. Batch experiments were conducted to remove Ni2+ from synthetic solutions. Effects of various operating parameters such as pH, contact time, activated carbon loading and initial Ni2+ ion concentration on the adsorption process of Ni2+ have been studied. Kinetic and isotherm studies for the removal of Ni2+ from synthetic wastewater were carried out. Langmuir isotherm model fits to the adsorption of Ni2+ ion onto activated carbon sourced from CCP. The pseudo-second-order model was found to explain the kinetics of Ni2+ adsorption most effectively. The optimization of the process was carried out by using central composite rotary design in response surface methodology.