Table 1.

Comparison of adsorption capacity of various agricultural wastes.

Agricultural waste	Metal	Adsorption capacity (mg/g)	Reference
Wheat bran	Pb	69–87	[11]
Rice bran	Cu	27.81	[12]
Black gram husk	Pb, Cd, Zn, Cu, Ni	19.56–49.97	[13]
Dal husk	Cr(VI), Fe(III)	96.05, 66.63	[14]
Coffee waste	Pb	63	[15]
Exhausted coffee	Cr(VI)	1.42	[16]
Coffee husk	Cu	7.5	[17]
Tea residue	Cu/Pb	48–65	[18]
Almond shell	Pb	8.08, 28.18	[19]
Nut shell	Cr(VI)	1.47	[16]
Walnut shell	Cr(VI)	1.33	[16]
Chestnut shell	Cu	12.56	[20]
Peanut shell	Cu	21.25	[21]
Peanut hull	Cu/Pb	0.18, 0.21	[22]
Mango peel	Cu	46.09	[23]
Grape bagasse	Pb	0.428	[24]
Barley straw	Cu/Pb	4.64, 23.2	[19]
Saw dust	Cr(VI)	10.01, 16.05	[25, 26]
Coir fibers	Pb	263	[27]
Pumpkin waste	Cr(VI), Pb	68	[28]
Sugar beet pulp	Cu	31.4	[29]
Pea waste	Cr(VI)	21.2	[30]