Table 4 IM study data of removal of Cr6+ ions of various starting concentrations (100–400 mg/L) at 25 ± 2 °C onto 0.5–2.5 g/L NDAC600 doses.

From: Formation of self-nitrogen-doping activated carbon from Fish/sawdust/ZnCl2 by hydrothermal and pyrolysis for toxic chromium adsorption from wastewater

Isotherm model

Isotherm Parameters

NDAC600 (g/L)

0.5

1.0

1.5

2.0

2.5

LIM

Qm (mg/g)

769.23

476.19

277.78

185.19

156.25

Ka × 103

2.71

15.31

34.85

67.33

86.72

R2

0.294

0.791

0.777

0.940

0.981

FIM

1/n

0.06

0.34

0.42

0.78

0.72

KF (mg1–1/nL1/ng–1)

1.07

0.30

0.22

0.05

0.07

R2

0.271

0.852

0.798

0.978

0.864

HIM

1/nH

0.831

0.563

0.444

0.344

0.370

KH

18.5

236.0

2010.0

2.300.0

9140.0

R2

0.960

0.965

0.924

0.981

0.986

TIM

AT

0.07

0.18

0.49

1.35

1.40

BT

263.17

95.63

53.16

31.59

28.18

R2

0.848

0.864

0.785

0.893

0.940

DRIM

Qm (mol kg–1)

433.98

208.62

140.43

107.20

88.77

K × 106 (mol kJ–1)2

96,400

21,300

3700

1100

900

E (kJ mol–1)

2.28

4.85

11.62

21.32

23.57

R2

0.766

0.686

0.583

0.622

0.622

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