Concentration of heavy metals leached from pGO-mAHS and dye adsorbed pGO-mAHS at different pH conditions.
| Heavy metals | Concentration of heavy metals (μg L−1) | ZDHC limit (mg L−1) | |||||
|---|---|---|---|---|---|---|---|
| Leachate from RhB adsorbed pGO-mAHS | Leachate from pGO-mAHS | ||||||
| pH 3 | pH 7 | pH 10 | pH 3 | pH 7 | pH 10 | ||
| Fe | <0.000 | <0.000 | <0.000 | <0.000 | <0.000 | <0.000 | — |
| Ni | 541.330 | 258.794 | 32.737 | 25.022 | 19.161 | 4.916 | 0.2 |
| Cr | 2.769 | 0.574 | 0.465 | 2.024 | 3.992 | 3.275 | 0.2 |
| Zn | 284.708 | 236.491 | 251.450 | 245.275 | 116.917 | 348.177 | 5.0 |
| Cd | 0.527 | 0.143 | 0.031 | 0.255 | 0.095 | 0.035 | 0.1 |