Isotherm Langmuir Freundlich
  qm(mg/g) KL(L/mg) r2 KF n r2
nZVI 4.8476 0.4677 0.9957 3.6838 0.5705 0.9916
Pd-nZVI 6.6181 0.5488 1.0000 7.6278 0.6477 0.9904
Table 2: Isotherm constants for the adsorption of 4C2NP.