Sorbents

pH

Cr(III)

Cr(VI)

References

Ectodermis of opuntia

4

15.38

2.91

[6]

Wheat bran

3

-

0.942

[9]

Palm flower

4.5

5.99

4.90

[37]

Hazelnut shell

4

3.08

-

[48]

Hazelnut shell

2

-

17.7

[48]

Cross-linked chitosan

4

6.00

215

[49]

Rose waste

5

67.34

-

[50]

Rice bran

5

0.13

0.069

[51]

Native saltbush stem

5

16.3

0.00

[52]

Native saltbush leaves

5

22.7

0.1

[52]

Native saltbush flowers

5

27

0.1

[52]

Lignin

<3

6.59

-

[53]

Lignin

<2

-

5.64

[53]

Rubber wood saw dust

2

4.87

[54]

Okra leaves

4

221.17

-

This study

Okra leaves

2

-

81.94

This study