Kinetic Model

Parameters

Pb2+ ion

Cu2+ ion

Pseudo-first order

kad (min−1)

qe, cal (mg/g)

R2

0.059

62.08

0.836

0.023

26.12

0.958

Pseudo-second order

qe, cal (mg/g)

k (g∙mg−1∙min−1)

h (mg∙g−1∙min−1)

qe, exp (mg/g)

R2

52.63

2.23 × 10−3

6.17

48.5

0.997

52.63

1.47 × 10−3

4.08

49.2

0.996