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.