Microstructure properties and surface functional groups of the biocharsa.
| Biochars | BET surface area (m2 g−1) | Total pore volume (mL g−1) | Average pore diameter (nm) | Surface functional groups (μmol g−1) | ||
|---|---|---|---|---|---|---|
| Acidic | Basic | Carboxylic | ||||
| PC300 | 3.79 | 0.014 | 14.66 | 2060.74 | 803.89 | 374.16 |
| PC500 | 18.05 | 0.061 | 13.60 | 1813.15 | 4880.48 | 837.49 |
| PC700 | 188.57 | 0.134 | 2.84 | 1148.62 | 4300.97 | 147.55 |
| SC300 | 12.97 | 0.028 | 8.77 | 1870.43 | 600.24 | 539.89 |
| SC500 | 47.07 | 0.070 | 5.97 | 1359.73 | 2749.31 | 189.43 |
| SC700 | 218.70 | 0.138 | 2.52 | 851.65 | 3790.90 | 158.76 |
a
Spent Pleurotus ostreatus substrate biochar (PC), spent shiitake substrate biochar (SC).