Table 5 Langmuir and Freundlich isotherm parameters and correlation coefficients for Pb+2, Cu+2, and Cd+2 adsorption onto CaCO3 and CaO.

From: Effective removal of heavy metal ions (Pb, Cu, and Cd) from contaminated water by limestone mine wastes

Model

Parameters

CaCO3

CaO

Pb+2

Cu+2

Cd+2

Pb+2

Cu+2

Cd+2

Langmuir

qmax (mg/g)

270.3

73.53

0.61

1666.6

769.2

1250

KL (b)

0.086

6.18

0.5

1.5

13

4

RL

0.019–0.011

0.003–0.001

0.038–0.013

0.0007–0.0003

0.0007–0.00011

0.001–0.0005

R2

0.957

0.9845

0.9881

0.9997

0.862

0.999

Freundlich

Kf

324.56

98.22

1.53

3409.57

978.1

832.72

n

− 52.35

14.92

− 5.49

− 8.1

− 4.73

3.8

R2

0.3394

0.2277

0.7469

0.9357

0.94

0.9775

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