Adsorbent

Initial concentration (mg∙L⁻¹)

Adsorption efficiency (%)

Heat-acid activate red mud

0.08

92.21

Acid activate red mud

0.08

84.23

H₂O₂ activate red mud

0.08

−18

Calcined red mud (400˚C)

0.08

−37.12

Calcined red mud (600˚C)

0.08

−204.73

FeCl₃∙6H₂O activate red mud

0.08

96.18

AlCl₃∙6H₂O activate red mud

0.08

43.54

CaCl₂ activate red mud

0.08

13.03

1% CTAB activate red mud

0.08

14

1% SDBS activate red mud

0.08

−13.125