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Table 4 Adsorption parameters for Cu(II), Zn(II), Cd(II), and Pb(II) ions sorption on ST20 and ST20-ALG obtained from LM, FM, and D-RM

From: Titania-Coated Silica Alone and Modified by Sodium Alginate as Sorbents for Heavy Metal Ions

Isotherm

Parameters

Cu(II)

Zn(II)

Cd(II)

Pb(II)

ST20

 LM

qe (mg g−1)

20.26

17.63

16.73

26.89

KL (L mg− 1)

0.056

0.065

0.049

0.184

R 2

0.9999

0.9998

0.9992

0.9999

 FM

KF (mg g−1)

4.12

6.25

2.73

6.82

n

3.266

5.301

3.431

4.609

R 2

0.9657

0.9563

0.9388

0.9551

 D-RM

KDR (mg g−1)

0.001

0.011

0.001

0.002

E (kJ mol−1)

11.794

13.009

11.408

13.077

R 2

0.9825

0.9847

0.9900

0.8021

ST20-ALG

 LM

qe (mg g−1)

22.44

19.95

18.85

32.49

KL ((L mg−1)

0.027

0.044

0.123

0.227

R 2

1.0000

0.9999

0.9999

0.9999

 FM

KF (mg g−1)

4.12

5.12

3.33

9.54

n

3.113

4.224

2.551

3.789

R 2

0.9612

0.9222

0.9439

0.9472

 D-RM

KDR (mg g−1)

0.002

0.002

0.001

0.001

E (kJ mol−1)

11.247

12.778

11.333

15.651

R 2

0.9001

0.9873

0.9355

0.9982

  1. LM Langmuir isotherm model, FM Freundlich isotherm model, D-RM Dubinin–Radushkevich isotherm model

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