Metal ion

Langmuir isotherm

Freundlich isotherm

K_L

Q_max

R_L

R²

K_f

1/n

R²

Pb(II)

0.203

89.29

0.0073

0.9810

16.43

0.6324

0.9919

Cd(II)

0.246

47.85

0.0024

0.9605

10.21

0.6049

0.9797

Zn(II)

0.229

60.24

0.0021

0.9732

11.98

0.6324

0.9867