Table 5 Comparison of the nutrient adsorption capacity of different adsorbents
Biochar/Adsorbent | Pyrolysis(°C) | Treatment | Solution | Adsorbate | Adsorption capacity (mg g−1) | Ref. | |
|---|---|---|---|---|---|---|---|
Pre- | Post- | ||||||
Giant reed straw | 500 | – | – | NH4+ | NH4+ | 1.5 | 34 |
Corncob | 400 | – | – | NH4+ | NH4+ | 2.5 | 37 |
Corncob | 400 | – | HNO3 | NH4+ | NH4+ | 2.6 | 37 |
Rubber tyre | NA | – | – | NO3− | NO3− | 16 | 22 |
Soybean | 400 | – | HCl | NO3− + NO2− | NO3− | 8.6 | 38 |
Chitosan microspheres | – | – | – | NO3− | NO3− | 32 | 15 |
Chitosan microspheres | – | – | – | PO43− | PO43− | 34 | 15 |
Oak wood | 600 | – | – | PO43− | PO43− | 3.6 | 26 |
Oak wood | 250 | – | – | PO43− | PO43− | 27 | 26 |
Soybean straw | 500 | – | – | NH4+ + NO3− + PO43− | NH4+ | ≈ 0.50 | 13 |
Soybean straw | 500 | – | – | NH4+ + NO3− + PO43− | PO43− | ≈ 2.5 | 13 |
Soybean straw | 500 | AlCl3 | – | NH4+ + NO3− + PO43− | NO3− | ≈ 7.0 | 13 |
Coconut husk | 400 | – | – | NH4+ + NO3− + PO43− | NH4+ | 5.0 | This study |
Coconut husk | 400 | – | chitosan | NH4+ + NO3− + PO43− | NO3− | 1.6 | This study |
Coconut husk | 400 | – | eggshell | NH4+ + NO3− + PO43− | PO43− | 1.5 | This study |