Table 3.
Maximum adsorption capacity of some adsorbents for Cr(VI) ions removal.
| Adsorbent | pH | Time (min) | Concentration of Cr (VI) (mg/l) | Adsorption capacity (mg/g) | Source |
|---|---|---|---|---|---|
| Aluminum –magnesium mixed hydroxide | 2.5–5 | 90 | 200 | 105.3–112 | 92 |
| LDHNSs | 6 | 8 | 20–200 | 125.97 | 93 |
| maghemite nanoparticles | 2.5 | 15 | 50 | 19.2 | 94 |
| Fe3O4@C@MgAl-LDH | 6 | 60 | 100 | 152 | 95 |
| flowerlike α-Fe2O3 | 3 | 180 | 25 | 30 | 96 |
| Poly aniline-polyethylene glycol composite | 5 | 30 | 50 | 68.97 | 97 |
| Melaleucadiosmifolialeaf | 7 | 120 | 250 | 62.5 | 98 |
| Halloysite nanotubes | 3 | 30 | 50 | 6.9 | 99 |
| Zn/Al LDH | 5.2 | 15 | 2.00 | 10.23 | 39 |
| Zn/Al/Ala LDH | 5.2 | 15 | 2.00 | 12.25 | 39 |
| Ni/Fe LDH/GL | 5 | 30 | 50 | 136.05 | This study |
| Ni/Fe LDH | 5 | 30 | 50 | 50.43 | This study |