Isotherm model Equation
Langmuir
Freundlich
Dubinin-Radushkevich
Table 1: Summary of equilibrium isotherms (KL, KF, K′: Langmuir, Freundlich and Dubinin–Radushkevich constants; n: heterogeneity coefficient; qm, X′m : maximum adsorption capacity; qe: uptake at equilibrium; Ce: equilibrium concentration; E: adsorption energy).