where ΔG°, ΔS° and ΔH° are standard free energy change, standard
enthalpy change and standard entropy change, respectively, Kc is the
equilibrium constant, Cs is the equilibrium concentration of HA on oxidized
activated carbons (mg/L), Ce is the equilibrium concentration of
HA in solution (mg/L), R is the ideal gas constant (8.314 J/mol K) and
T is the adsorption temperature on Kelvin scale.