A summary for the adsorption of Pb2+ and Cd2+ using HAp based materials.
| Adsorbent | Form | Processing | HAp (%) | Adsorbate | Adsorption capacity (mg g−1) | Ref. |
|---|---|---|---|---|---|---|
| PLA/HAp | Foams | Supercritical CO2 foaming | 40 | Pb | 140.5 | 10 |
| HAp | Powder | Hydrothermal | 100 | Cd | 89.9 | 58 |
| Pb | 154 | |||||
| Commercial synthetic HA | Cd | 188.9 | 9 | |||
| Neutralization of Ca(OH)2 with H3PO4, at room temperature | Cd | 67.55 | 70 | |||
| Pb | 676.09 | |||||
| HAp/polyurethane | Foam | Immobilization | 50 | Pb | 150 | 22 |
| HAp/polyacrylamide | Hydrogel | Free radical polymerization | 70 | Pb | 178 | 21 |
| Fe3O4/HAp | Powder | Hydrothermal | 85 | Cd | 219.9 | 24 |
| In situ precipitation | 50 | Pb | 598.8 | 23 | ||
| Fe3O4/HAp/bentonite | • Co-precipitation | Cd | 309 | 71 | ||
| • Hydrothermal | Pb | 482 | ||||
| PLA/HAp | 3D filter | 3D printing | 15 | Cd | 360.5 | This study |
| Pb | 112.6 |