Dye Adsorption on Expanding Three-Layer Clays - Green Chemistry for Dyes Removal from Wastewater - page 348

Table 9.6 Adsorption of cationic and anionic dyes by the expanding three-layer clays using the Langmuir and
Freundlich models.

Adsorbents Dyes name Langmuir Freundlich

q max
mg/g

K L
L/g

K f
mol/g

n Reference

Sodium montmorillonite Acid fuchsin 2.76*10 -4 5.81*10 -4 1.48 1.21 [23]

hermal Activated
Acid Activated
Combined acid and ther-
mal activation

Congo red (CR) 54.64

69.44
75.75

0.061
0.060
0.068

4.84
5.62
6.99

1.68
1.73
1.79

[25]

Natural bentonite Basic Yellow 28

Basic Red 46

256.4
333.3

0.257
0.769

[30]

Natural Bentonite Congo Red 35.84 0.23 [39]

Ca-bentonite Congo Red 107.41 0.11 26.91 3.23 [63]

Acid-activated bentonite Acid Red 57 and

Acid Blue 294

641.9
117.8

3.18
12.2

1.27
3.16

[70]

2.46 10 -3
7.16 10 -3

KSF-montmorillonite Remozal Brilliant

Blue R

30.76 0.28 [72]

Surfactant-Al- bentonite Supranol Yellow

4GL

111.11 0.2 [73]

CDBA-bentonite And
CP-bentonite

Acid Red 151 357. 14

416.66

0.5714
12.04

[83]