Table 3 Parameters of isotherms for methylene blue dye treatment using modified rice straw at different temperatures (293–333 K) and pH 6.

From: Isotherms, kinetics and thermodynamic mechanism of methylene blue dye adsorption on synthesized activated carbon

Model

Parameters

293 K

303 K

313 K

323 K

333 K

Langmuir

Kl × 10–4

7.663

4.404

1.490

1.147

2.491

qm × 104

9.64

8.58

6.36

4.14

3.01

R2

0.999

0.994

0.997

0.986

0.997

Freundlich

KF × 10–2

4.952

1.795

1.888

5.911

14.881

n

10.1

4.05

3.39

4.69

8.41

R2

0.683

0.731

0.898

0.965

0.980

Temkin

KT × 10–8

4.851

1.784

0.012

0.0062

0.173

b × 10–7

3.045

0.251

2.546

4.475

9.228

R2

0.702

0.754

0.935

0.932

0.968

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