Table 2 Comparison of parameters of different materials for Cr(VI) adsorption.

From: Hexavalent chromium elimination from wastewater by integrated micro-electrolysis composites synthesized from red mud and rice straw via a facile one-pot method

Adsorbent

Metal source

Preparation

Conditions

qmax (mg/g)

References

nZVI-RS

FeSO4·7H2O

600 °C, 2 h

pH 3.0–8.0

40.0

50

nZVI-HBC

FeSO4·7H2O

700 °C, 2 h

pH 3.0

96.0

35

S-nZVI/BC

FeCl·4H2O

400 °C, 3 h

pH2.5

126.0

51

SSB-nZVI

FeCl2·4H2O

NaBH4

pH 4.0

20.0

52

MMBC

Red mud

700 °C, 2 h

pH 3.0

99.8

53

IMC

Red mud, rice straw

800 °C, 1 h

pH 6.0

190.6

This work

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