Table 2 The maximum adsorption capacities of Cr(VI) obtained in some similar studies
Adsorbent | Maximum Cr(VI) adsorption capacity (mg g−1) | Reference |
|---|---|---|
Almond shell | 3.40 | (Pehlivan and Altun 2008) |
Walnut shell | 8.01 | (Pehlivan and Altun 2008) |
Hazelnut shell | 8.28 | (Pehlivan and Altun 2008) |
Rice straw biochar-supported nanoscale zero-valent iron | 40.00 | (Qian et al. 2017) |
Magnetic biochar prepared from Melia azedarach wood | 25.27 | (Zhang et al. 2018) |
Pinewood sawdust/Fe(NO3)3·9H2O magnetic biochar | 42.70 | (Yang et al. 2017) |
Biochar derived from almond shell supported nano-zero-valent iron composite | 26.63 | (Shu et al. 2020) |
Chitosan combined with magnetic loofah biochar | 30.14 | (Xiao et al. 2019) |
CaCl2-modified Sargassum oligocystum biomass | 34.36 | (Foroutan et al. 2018) |
Ziziphus spina–christi leaf-activated carbon | 13.81 | (Abshirini et al. 2019) |