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