Cephalosporins Langmuir model   KLL g-1) qm(mg g-1) R2 Cephalexin 0.0242 500.00 0.9966 Cefixime 0.0131 526.31 0.9930 Freundlich   KF(mg g-1)/(mg L-1)1/n n R2 Cephalexin 46.437 2.2502 0.9891 Cefixime 16.876 1.6270 0.9867 Dubinin–Radushkevich   X'm(mg g-1) K′ E (kJ mol-1) R2 Cephalexin 5.8327 -6E-05 84.515 0.8276 Cefixime 5.7789 -2E-04 50.000 0.8943

Table 2: Langmuir, Freundlich and Dubinin-Radushkevich isotherm constants for adsorption of Cephalexin and Cefixime.