Adsorbent conditions Cu(II) Ni(II) Cd(II) Pb(II) References
Olive stones A.C (ZnCl2)   - - 1.851 - Kula et al.
Granular A.C
Powdered A.C
pH 5 15.58
26.9
  3.37
3.37
15.58
26.90
Faur-Brasquet et al.
Chestnut shell A.C
Grapeseed A.C
  100.00
48.78
- - - Özc et al.
apricot stone A.C pH 6.5; 25°C 24.08 26.9 33.57 22.84 Kobya et al.
hazelnut shell A.C   51.52 - - - Demirbas et al.
hazelnut husks A.C pH5.7; 18°C 6.645 - - 13.05 Imamoglu et al.
Moso bombo A.C Lo et al.
S1C1 7.54; 25°C 0.401   0.174 0.407
S2C1 7.4; 25°C 0.400   0.257 0.396
Ma bomboo A.C
S1M1 10.02; 25°C 0.634   0.398 0.404
S2M1 7.95; 25°C 0.398   0.396 0.397
immobilized tannic acid A.C   2.224   1.461   Ucer et al.,
Carbon Nanotube pH 5 28.595   10.903 96.969 Li et al.,
Olive stone waste pH 5 5.655 5.165 16.972 28.386 Fiol et al.
Bamboo activated carbon pH 5; 23 °C 7.371 6.457 5.170 - Liu et al.
COSAC pH 5; 30°C 14.552 13.536 60.021 112.348 In this study
Table 5: Comparison of maximum adsorption capacities (mg.g-1) with various adsorbents for different metal ions.