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

In the present study, the adsorption characteristics of Ni 2+ onto activated carbon produced from the biomass residue Citrullus colocynthis peel was studied. Batch experiments were conducted to remove Ni 2+ from synthetic solutions. Effects of various operating parameters such as pH, contact time, activated carbon loading and initial Ni 2+ ion concentration on the adsorption process of Ni 2+ have been studied. Kinetic and isotherm studies for the removal of Ni 2+ from synthetic wastewater were carried out. Langmuir isotherm model fits to the adsorption of Ni 2+ ion onto activated carbon sourced from CCP. The pseudo-second-order model was found to explain the kinetics of Ni 2+ adsorption most effectively. The optimization of the process was carried out by using central composite rotary design in response surface methodology.