where C0 (mg/L) is the highest initial concentration of adsorbate
and Ka (L/mg) is Langmuir constant. The value of RL indicates
the shape of the isotherm to be either unfavorable (RL > 1), linear
(RL = 1), favorable (0 < RL < 1), or irreversible (RL = 0). The RL value
for the adsorption of MB onto JFP was 0.1269, indicating that the
adsorption is a favorable process.
The equilibrium datawere further analyzed using the linearized
form of Freundlich isotherm, by plotting ln qe versus ln Ce (Fig. 5).