Comparative and competitive adsorptive removal of Ni2Â + and Cu2Â + from aqueous solution using iron oxide-vermiculite composite

In the kinetic study, the experimental data fitted well the pseudo-second-order kinetics for Ni2 + and Cu2 + adsorption data. Furthermore, calculated thermodynamic parameters, ΔG°, ΔH° and ΔS° of adsorption showed that the adsorption of Ni2 + and Cu2 + was feasible, spontaneous and an exothermic process.