8

Co-precipitation

Dendrimers

Amine group

90

Zn(II)

[68]

9

Co-precipitation followed by a

sol-gel process using sodium

silicate (Fe₃O₄@SiO₂)

(3-aminopropyl)

Trimethoxysilane

Amine group

-

Pb(II), Cd(II), Cu(II)

[69]

10

Stabilization of Fe⁰ nanoparticles

with Fe₃O₄

-

-

47.8

Cr(VI)

[70]

11

Bacterial reduction of schwertmannite

-

-

-

Cr(VI), Tc(VII)

[71]

12

Co-precipitation

-

-

-

As(V)

[72]

13

Commercially available

magnetite-maghemite mixture

nanoparticles

-

-

65

As(V), As(III), Cr(VI)

[73]

14

Commercially available Magnetite

-

-

99

As(V), As(III)

[74]

15

Modification of co-precipitation method

Starch

Hydroxyl group

91

As(V)

[75]