Where, KF is the Freundlich adsorption constant related to the adsorption capacity of the adsorbent (mg/g) (mg/L). 1/n and n are dimensionless constants of the adsorbents, which can be used to explain
the adsorption intensity between the solute concentration and adsorbent respectively. The values of R2, KF and n were determined from the slopes
and intercepts of the linear plots of Log qe against Log Ce (Table 2).