Adsorbent

Adsorption capacity (mg/g)

Cu²⁺ ion

Pb²⁺ ion

References

Aniline formaldehyde coated

76.3

−

[23]

Tree fern

11.7

−

[24]

Grafted silica

16.5

−

[25]

Dye loaded sawdust

9.8

17.90

[26]

HCl treated clay

80.90

63.20

[27]

Cork biomass

44.60

22.22

[28]

p-tert(dimethylamino)methyl-calix[4]arene

52.80

36.40

[29]

Modified coir fibers

4.33

7.88

[30]

Green algae spirogyra

133.0

−

[31]

Succinylatedmercericed cellulose (DIPCI)

56.8

147.1

[32]

Hyperbranched aliphatic polyester grafted cellulose

9.8

−

[33]

Vinyl pyrrolidone grafted cellulose

−

323

[34]

Poly(hydroethyl acrylate)-Grafted cross-linked poly(vinyl chloride)

55

−

[35]

Cellulose modified with azomethine (DTD)

157.3

153.5

Present work