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| adsorbent | adsorption capacity (mg·g–1) | temperature (°C) | ref. |
|---|---|---|---|
| rice husk ash | 6.28 | 25 | (42) |
| cassava residue-derived biochar | 9.68 | 25 | (39) |
| modified Ni–Al LDH | 8.86 | (43) | |
| calcined magnetic iron nanoparticles | 12.80 | 30 | (44) |
| ilmenite biochar composite | 15.06 | (45) | |
| calcined bean dregs-hydrocalumite composites | 15.85 | 30 | present study |
