Isotherm model

Parameters

Cu2+ ion

Pb2+ ion

Langmuir

K (L/mg)

qm (mg/g)

R2

0.0737

157.3

0.9686

0.0962

153.5

0.9763

Freudlich

Kf (mg/g)

n

R2

38.05

3.6

0.8032

41.1

3.74

0.9675