Isotherm model

Parameters

Cu²⁺ ion

Pb²⁺ ion

Langmuir

K (L/mg)

q_m (mg/g)

R²

0.0737

157.3

0.9686

0.0962

153.5

0.9763

Freudlich

K_f (mg/g)

n

R²

38.05

3.6

0.8032

41.1

3.74

0.9675