Table 2.
Reported As(V) adsorption capacities of various adsorbents.
| Adsorpent | Kinetics model | (mg g −1) | Isotherm model | mg g −1) | Initial concentration (mg l−1) | pH | Reference |
|---|---|---|---|---|---|---|---|
|
| |||||||
| Maghemite nano particles | 2h, Pseudo 1st and 2nd order | NA | Langmuir and Freundlich | 4.64 | 1 | 7 | (Park et al., 2008) |
| Magnetite- maghemite | 3h, two steps | 4.85 | Langmuir | 6 | 2 | 6.5 | (Chowdhury et al., 2010) |
| Biochar/γ -Fe2O3 | 24h, Pseudo 2nd order | 3.525 | Langmuir | 3.147 | 50 | NA | (Zhang et al., 2013a) |
| ZVI-RO ZVISG | 48h, Pseudo 2nd order | 15.87 6.94 |
Langmuir | 15.58 7.92 |
25 | NA | (Bakshi et al., 2018) |
| Peanut shell biochar | Pseudo 1st and 2nd order | 4.76 | Langmuir, Freundlich, and others | 7.94 | 5 | 5.4 | (Sattar et al., 2019) |
| 20%-BC/VE | 48h, Pseudo 2nd order | 6.5 | Langmuir | 20.1 | 20 | This study | |