Research Article
Adsorptive Removal of Hexavalent Chromium by Diphenylcarbazide-Grafted Macadamia Nutshell Powder
Table 4
Comparison of adsorption capacities.
| Adsorbents | Pretreatment | Functionalization | pH | (mg/g) | References |
| Potato peels | HCl | — | 2.5 | 3.28 | [45] | Raw rutin | Extraction/isolation | — | 3 | 26.3 | [34] | Rutin resin | Formaldehyde/HNO3 | — | 3 | 41.6 | [34] | Banana peels | HCl/NaOH/H2O2 | Acrylonitrile grafted | 3 | 6.17 | [31] | Palm branches | H2SO4 | — | 2 | 25 | [32] | Palm branches | Acetic acid | Chitosan | 6 | 55 | [32] | Palm branches | H2SO4 | Cationic surfactant | 6 | 41.7 | [32] | Grape peelings | H2O2 | — | 5.5 | 39.06 | [7] | Banana peels | — | — | 5 | 3 | [15] | Orange peels | — | — | 3 | 9 | [15] | Coir pith | — | Acrylic acid | 2 | 165 | [16] | Masau stones | NaOH | Epichlorohydrin/diethylenetriamine | 3.5 | 87.33 | [19] | Coir pith | — | Acrylic acid | 2 | 196 | [16] | Macadamia nutshell | H2O2 | — | 1 | 37.74 | This study | Macadamia nutshell | H2O2 | Diphenylcarbazide | 1 | 72.12 | This study |
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