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Table 3 Kinetic parameters for Cu(II), Zn(II), Cd(II), and Pb(II) ions sorption on ST20-ALG

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

Model

Parameter

Cu(II)

Zn(II)

Cd(II)

Pb(II)

PFO

q 1,cal

6.29

7.21

6.23

8.38

k 1

0.022

0.003

0.028

0.001

t 1/2

0.04

0.008

0.007

0.009

R 2

0.9532

0.8573

0.9686

0.9387

PSO

q 2,cal

10.19

11.47

12.75

19.99

k 2

0.020

0.013

0.034

0.063

h

2.040

1.691

3.957

2.200

t 1/2

0.002

0.0011

0.003

0.0032

R 2

0.9913

0.9986

0.9984

1.0000

IPD

ki1 (mg g−1 min−1/2)

0.94

1.29

0.64

1.28

C 1

3.25

1.92

5.84

3.95

R 2 1

0.9532

0.9008

0.9399

0.9642

ki2 (mg g−1 min−1/2)

0.62

0.59

0.44

0.64

C 2

4.27

5.02

6.65

16.25

R 2 2

0.9142

0.7714

0.9489

0.8927

ki3 (mg g−1 min−1/2)

0.54

0.23

0.49

0.03

C 3

4.67

7.94

6.12

19.50

R 2 3

0.9566

0.5984

0.9692

0.8214

EM

a

8.12

7.45

5.97

9.79

b

0.59

0.57

0.75

0.64

R 2

0.9516

0.9494

0.9123

0.8688

  1. PFO pseudo first order, PSO pseudo second order, IPD intraparticle diffusion model, EM Elovich model

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