D-K-R Equation Parameters

Energy of Activation

Metal

R2

qm(mg/g)

β(mol2/J2)

E (kJ/mol)

R2

Ea(kJ/mol)

A

Lead

0.92

8.88

3e-06

0.41

0.99

4.89

9.88

Cadmium

0.88

5.84

3e-06

0.41

0.95

3.49

179.9

Copper

0.81

4.53

5e-06

0.32

0.95

3.39

16.45

Table 2: D-K-R and Arrhenius parameters for the adsorption of Pb (II), Cd (II) and Cu (II) onto raw wheat straw.