Table 4 Isotherm models investigation data of AY36 dye adsorption of 100–400 mg/L as initial dye concentration onto 0.5–2.5 g/L NDAC800 doses at 25 ± 2 °C.

From: Fabrication of N-doping activated carbons from fish waste and sawdust for Acid Yellow 36 dye removal from an aquatic environment

Isotherm models

IM parameters

NDAC800 (g/L)

0.5

1.0

1.5

2.0

2.5

Langmuir

Qm (mg/g)

232.56

169.49

169.49

188.68

142.86

Ka × 103

25.34

38.89

35.04

36.53

86.85

R2

0.947

0.948

0.932

0.892

0.897

Freundlich

1/n

0.21

0.16

0.28

0.42

0.30

KF (mg1-1/nL1/n/g)

63.61

60.62

33.88

21.90

32.94

R2

0.619

0.815

0.946

0.895

0.921

Temkin

AT

1.19

7.89

0.93

0.45

2.53

BT

34.93

19.40

27.59

37.91

22.29

R2

0.600

0.748

0.861

0.863

0.810

Dubinin-Radushkevich

Qm (mol/kg)

178.70

128.09

111.37

117.08

84.88

K × 106 (mol/kJ)2

48,800

6900

6500

10,900

500

E (kJ/mol)

3.20

8.51

8.77

6.77

31.62

R2

0.327

0.537

0.609

0.780

0.565

Halsey isotherm

1/nH

0.2053

0.1611

0.2796

0.4197

0.3025

KH

6.09E+08

1.16E+11

2.96E+05

1.56E+03

1.04E+05

R2

0.6189

0.8148

0.9458

0.8895

0.9208

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