Comparison of the maximum adsorption capacities of Cu(ii) by different adsorbents reported in the literature.
| Silica gel-ligand | Metal ion (mg g−1) | Reference |
|---|---|---|
| Pyridin-2-ylmethanol | 90.25 | This work |
| Porphyrin | 19.08 | 67 |
| N-Propyl-2-pyridylimine | 35.63 | 68 |
| Methyl methacrylate | 41.36 | 69 |
| Dithiocarbamate | 25.00 | 70 |
| (E)-4-(Furan-2-ylmethyleneamino) phenol | 36.20 | 71 |
| (E)-2-(Furan-2-ylmethyleneamino) phenol | 79.36 | 71 |
| 3-Hydroxysalicylaldiminepropyltriethoxy-silane | 5.72 | 72 |
| Furan ketone enol | 31.82 | 73 |
| 3-Amino-1,2-propanediol | 31.18 | 74 |
| Commercial Lewatit (L-207) | 68.09 | 75 |
| Bis(pyrazole)butane | 20.24 | 76 |