Table 4.

Comparison of adsorption capacity Cr (VI) onto VB with other adsorbents.

Adsorbents	pH	Particle size (μm)	Adsorbent dosage (g L−1)	Metal conc. (mg L−1)	Adsorption capacity (mg kg−1)	Reference
Clay (treated)	2.5	75	20	10	200	[71]
Palygorskite clay	7	-	2	100	58480	[73]
Kaolinite	4.6	-	2	50	6100	[74]
Volcanic pumice	2	75–425	100	10	46.05	[37]
Riverbed sand	2.5	-	20	7.84	150	[75]
VB	2	90–500	50	5	79.20	This study