Table 1: BET surface areas and removal capacity of different kinds of adsorbent samples.

Adsorbent samplesBET surface area
(m2·g−1)
Adsorption capacity for Cr(VI)
(mg·g−1)

Fe2O3-Mn3O4 (1 : 0)*18722.9
Fe2O3-Mn3O4 (1 : 2.5)*21321.3
Fe2O3-Mn3O4 (1 : 5)*22221.2
Fe2O3-Mn3O4 (1 : 10)*26424.6
Fe2O3-Mn3O4 (1 : 15)*26826.3
Mn3O46111.6
-Fe2O3 [15]17819.4
Fe3O419821.0
MnFe2O4(MnO2 and Fe2O3) [14] 20831.3

Different ratio of MnCl2 to KCl in the preparation.