Ion

Adsorption capacity, mmol/g

Quantitative extraction, mmol/g

Color of complex

W(VI)

5.70

˂0.30

white

Mo(VI)

0.76

˂0.30

pale green

Cr(VI)

0.44

˂0.01

grey-yellow

V(V)

0.70

˂0.10

yellow

Co(II)

0.12

-

violet

Zn((II)

0.18

˂0.02

white

Cu(II)

0.22

˂0.12

light blue

Pb(II)

0.02

-

white

Cd(II)

0.11

-

white