Table 3 Adsorption isotherm model analysis for BB41 and EBT.

From: The development of Giant reed biochar for adsorption of Basic Blue 41 and Eriochrome Black T. azo dyes from wastewater

Isotherm models

 

BB41

EBT

Dubinin-Radushkevich (D-R) isotherm

intercept

2.515

1.908

slope

–9.98E + 08

–3.53E + 07

β (mol2/k2 J2)

9.98E + 08

3.53E + 07

E (KJ/mol)

2.24E-05

1.19E-04

qm

12.366

6.739

R2

0.933

0.887

Freundlich isotherm

Intercept

2.216

0.934

slope

0.896

0.439

1/nf

0.896

0.439

Kf

9.169

2.544

R2

0.985

0.935

Langmuir isotherm

Intercept

0.017

0.11

slope

0.0914

0.314

Qmax

58.48

9.09

KL

0.187

0.35

RL

0.15

0.087

R2

0.995

0.995

Temkin isotherm

intercept

9.478

2.426

slope

5.298

1.943

BT(J/mol)

5.298

1.943

KT L/mg)

5.983

3.485

R2

0.921

0.970