Table 4 The adsorption isotherm parameters of OS-M(P) and OS-M(G) for Pb(II) and Cd(II).

From: Adsorption properties of Pb(II) and Cd(II) in acid mine drainage by oyster shell loaded lignite composite in different morphologies

Isotherm model and parameters

Pb(II)

Cd(II)

OS-M(P)

OS-M(G)

OS-M(P)

OS-M(G)

15 °C

25 °C

35 °C

15 °C

25 °C

35 °C

15 °C

25 °C

35 °C

15 °C

25 °C

35 °C

Langmuir

 qm

331.1064

332.6219

336.6549

101.3423

93.6463

85.4838

278.4663

318.9854

320.7048

6.1763

6.7822

5.8340

 KL

5.6535

6.0358

7.4839

0.8167

1.2940

1.8875

2.7857

2.7885

4.6931

11.4101

13.8031

39.3041

 R2

0.9841

0.9972

0.9970

0.9463

0.9897

0.9949

0.9823

0.9659

0.9595

0.9602

0.9623

0.8822

Freundlich

 KF

185.2500

242.1503

229.6895

47.1470

57.3174

59.7620

175.1987

150.5919

158.2080

3.7478

3.9763

4.1319

 1/n

0.2322

0.0976

0.1344

0.7010

0.6507

0.5938

0.4255

0.2847

0.2767

0.1452

0.1478

0.1307

 R2

0.6952

0.6613

0.7056

0.9792

0.9995

0.9949

0.7882

0.7339

0.7471

0.9878

0.9887

0.9638

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