Table 3 shows the parameter sets obtained by fitting the experimental data to different models. The Langmuir isotherm provides accurate fitting at high temperature while Dubinin–Radushkevich isotherm is better at low temperature. Despite experimental data being reasonably fitted by Freundlich isotherm (r2 = 0.98), the adsorption capacity value,qmax, obtained with Langmuir and Dubinin–Radushkevich models, represents in a better way the experimentally obtained adsorption capacity. In Langmuir isotherm, the equilibrium parameter RL, which is defined as RL = 1/(1 + KLC0) in the range of 0 < RL < 1, reflects a favourable adsorption process [37] where KL (L mg−1) is the Langmuir's constant and C0 (mg L−1) is the initial adsorbate concentration. In this work, the equilibrium parameter ( Table 3) was found to be in the range of 0 < RL < 1 therefore indicating that the adsorption process was favourable.