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| Hydrogel | pH | Metal ions (mg g−1) | ||
|---|---|---|---|---|
| Cu(ii) | Cd(ii) | Pb(ii) | ||
| H1 | 3 | 22.9 | 19.5 | 26.2 |
| 4 | 23.0 | 24.6 | 28.2 | |
| 5 | 32.3 | 14.7 | 25.4 | |
| H2 | 3 | 24.1 | 21.0 | 28.0 |
| 4 | 23.5 | 27.0 | 29.4 | |
| 5 | 32.0 | 15.0 | 26.4 | |
| H3 | 3 | 23.0 | 20.3 | 26.6 |
| 4 | 23.6 | 26.9 | 27.8 | |
| 5 | 31.4 | 15.7 | 25.5 | |
