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Table 5 Langmuir and Freundlich equilibrium parameters for the adsorption of lead and cadmium on activated carbons

From: Adsorption of aqueous Cd(II) and Pb(II) on activated carbon nanopores prepared by chemical activation of doum palm shell

Adsorbent Metal Langmuir parameters Freundlich parameters
qmax (mg/g) KL (l/mg) RL R2 N KF (l/mg) R2
NaOH-AC Cd(II) 100 2.01 × 10−4 0.999 0.996 1.00 0.02 1.00
Pb(II) 500 4.01 × 10−5 0.998 1.000 1.00 0.02 1.00
KOH-AC Cd(II) 1000 2.00 × 10−4 0.999 1.000 1.00 0.02 1.00
  333 6.03 × 10−5 0.997 1.000 1.00 0.02 1.00
ZnCl2-AC Cd(II) 125 1.59 × 10−4 0.992 1.000 0.99 0.02 0.99
Pb(II) 250 8.04 × 10−5 0.996 1.000 1.00 0.02 1.00
Regular AC Cd(II) −125 1.60 × 10−4 0.992 1.000 1.00 0.02 1.00
Pb(II) 167 1.20 × 10−3 0.943 1.000 1.00 0.02 1.00