Table 2: Comparison of the adsorption capacity, contact time, and particle size of SCMNPs with similar adsorbents in removing of Cd(II).

Adsorbent

Adsorption capacity mg/g

Contact time

Particle size of adsorbent

Ref.

Aluminosilicates

42.7-57.9

20 h

0.2-2.18 mm

[27]

Calcite

18.52

10 min

100 mesh

[28]

Chromite mine over burden

22.47

30 min

-

[29]

Iron ore slime

34.75

-

-

[30]

Low grade manganese ore

59.17

7 h

0.152 mm

[31]

Manganese nodule residue

21.2

1h

150 Mesh B.S.S passed

Particles (100% < - 100 μm)

[32]

Nickel laterite (high iron)

13.2

1 h

100% < 100 µm (-150 mesh )

[33]

Nickel laterite (low iron)

11

1 h

100% < 100 µm (-150 mesh )

[33]

Nickel, leaching residue

25

-

Smaller than 20 µm

[34]

Palygorskite

4.54

1 h

200 mesh

[35]

Perlite

0.64

6 h

1.7 mm

[36]

Red bauxite

38.77

-

-

[32]

Silica, mesoporous

111.3 ± 3.3

1 h

2-50 nm

[37]

Silicate MCM-41, mesoporous

100

1 h

2-50 nm

[37]

Oxidized MWCNTs

25.7

45 min

Outer diameters = 20-30 nm

Inner diameters = 5-10 nm

Length between 5 and 200 µm

[38]

SCMNPs

260.11

10 min

11.7-24.81 nm

Current study