| Adsorbents | Pb(II) | Cu(II) |
| References |
| Modified tea leaves (MTL) | 91.68 | 71.2 |
| This study |
| Peanut husk | 29.41 | _ | [31] | |
| Alfalfa biomass | 89.2 | _ | [32] | |
| Nipah palmshoot biomass | _ | 66.71 | [33] | |
| Azolla filiculoides | _ | 62 | [34] |