Low-cost adsorbents Adsorption capacities (mg/g) References
Diatomite 27.55 63
Modified diatomite 55.56 63
Sawdust 1.79 64
Peat 12.07 15
Low-rank Turkish coals 1.62 65
Tea-industry waste 8.64 66
Lentil Shell 9.59 27
Wheat shell 17.42 27
Rice shell 2.95 27
Grape stalk wastes 0.78 67
Citric acid modified soybean hulls 154.90 68
Cassava waste 56.82 69
Peanut hulls pellets 9.11 70
Banana peel 4.75 34
Orange peel 3.65 34
Cocoa shell 2.87 71
Teak leaves powder 13.14 72
Wheat shell 10.87 73
Herbaceous peat 4.84 74
Peanut hulls 10.17 75
Tobacco dust 36 76
Modified rice husk 29 77
Raw pomegranate peel 1.3185 78
Unmodified jute 4.23 79
Dye loaded jute 8.40 79
Oxidized jute 7.73 79
RSAC 5.729 80
RSD 8.1103 51
PMSD4 2.6631 51
SMSD3 12.484 51
Cotton boll 11.40 81
Sour orange waste 23.47 82
Sour orange waste (NaOH treated) 52.08 82
Soybean hulls 154.9 83
Dehydrated wheat bran 51.51 84
Modified orange peel 289 40
Rice husk 31.85 85
Formaldehyde modified sawdust (poplar tree) 13.95 55
NaOH modified sawdust (poplar tree) 6.92 54
Saw dust (fir tree) 12.70 54
HCl modified saw dust (oak tree) 3.60 86
Reactive orange 13 modifiedsawdust 8.07 87
Peanut husk 10.15 88
Cassava tuber bark waste 90.90 89
HCl modified Indian barks
Sal
Mango
Jack fruit

51.40
42.60
17.40

50
Reactive orange modified jute fibre 8.40 90
H202 modified jute fibre 7.73 90
Unmodified jute fibre 4.23 90
Banana pith 13.46 91
Carrot residues 32.74 92
Sugarbeet pulp 0.15 93
Groundnut shells 7.60 87
Peanut hull 8.00 94
Corn cobs 7.62 94
Corn starch 8.57 94
Pine bark 9.46 94
Table 6: Adsorption capacities of copper (II) ions on various low-cost adsorbents.