The linearized form of the pseudo-second order model is given in Fig. 8.
The values of the correlation coefficients were all extremely high and all greater than 0.999. Besides, the calculated
qe values agreed very well with the experimental data.
Thus experiment results supports the assumption behind the model that the rate limiting step in adsorption of heavy metals are chemisorption involving valence forces through the sharing or exchange of electrons between adsorbent and metal ions.
Some studies on the kinetics of Cr (VI) adsorption onto various adsorbents have
also reported higher correlations for pseudo-second order model.