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| Adsorbent | Contaminant | Adsorption capacity (mg g−1) | Ref. |
|---|---|---|---|
| MWCNTs | MO | 25.73 | 41 |
| MWCNTs | Sufranine O | 43.48 | 105 |
| MWCNTs | Procion red MX-5B | 44.68 | 106 |
| MWCNTs | Reactive blue 4 | 502.5 | 107 |
| SWCNTs | Reactive blue 4 | 567.7 | 107 |
| MWCNTs | Pb2+ | 4.00 | 108 |
| MWCNTs | Ni2+ | 7.53 | 109 |
| SWCNTs | Ni2+ | 9.22 | 109 |
| SWCNTs | Zn2+ | 43.66 | 110 |
| CNTs | Pb2+ | 49.95 | 111 |
