| Adsorbents | Adsorption capacity (mg/g) | Initial chromium conc mg/L | pH | Reference |
| Synthetic nano size zero valent iron | 17.240 | 1 to 30 | 7.0 | Rahmani, Samadi and Noroozi [36] |
| Saw dust | 0.198 | 1 to 10 | 5.0 | Aliabadi, Morshedzadeh & Soheyli [27] |
| Pine leaves | 0.470 | 1 to 10 | 5.0 | Aliabadi, Morshedzadeh & Soheyli [27] |
| Activated spent Pleurotus | 50.470 | 5 | 2-11 | Carol, Kingsley & Vincent [37] |
| Tea factory waste | 27.240 |
| 2.0 | Malkoc and Nuhoglu [38] |
| Polyaniline with rice husk | 4.739 |
| 3.0 | Kanwal et al., [39] |
| Polyaniline with rice saw dust | 5.128 |
| 3.0 | Kanwal et al., [39] |
| Fish-scales | 27.270 | 0.158 | 2.0 | This study |
| Egg-shells | 10.300 | 0.158 | 2.0 | This study |