where, Ce (mg/L) is the concentration of the dye solution
at equilibrium; qe (mg/g) is the amount of dye adsorbed
per unit weight of activated carbon at equilibrium; KL
(L/mg) is a Langmuir constant related to the free energy
of adsorption; and Qm (mg/g) is the maximum adsorption
capacity. KF is a Freundlich constant indicating the relative
adsorption capacity of the carbon, and 1/n is the adsorption
intensity.