Comparison of adsorption of azo dyes onto various adsorbents.
| Azo dye | Adsorbent | pH | Time (min) | q max (mg g−1) | References |
|---|---|---|---|---|---|
| Acid orange 7 | CuFe2O4/activated carbon | 5.2 | 1140 | 392 | 54 |
| Reactive orange 16 | CoFeNPs1/CoFeNPs2 | 4 | 75 | 68 | 15 |
| Methylene blue | Magnetic zeolite/iron oxide nanocomposite | 10 | 40 | 1.1 | 10 |
| Eucalyptus sheathiana bark biochar | 11.3 | 150 | 104.2 | 12 | |
| Wheat straw biochar | 8–9 | 120 | 12.03 | 53 | |
| Orange II | Zr-based chitosan | 2 | 30 | 926 | 4 |
| Reactive red 24 | CRHB-ZnO3 | 3 | 60 | 71.13 | This study |
| SBB-ZnO3 | 3 | 60 | 75.13 | This study |