Table 5 Specific surface area and pore volume before and after pretreatment for different substrates[108, 109]
| Substrate | Pretreatment conditions | Specific surface area (m2/g) | Pore volume (ml/g) |
|---|---|---|---|
| Rice straw | untreated | 1.33 | 0.004 |
| 130°C, 2% H2SO4, 15 min | 4.48 | 0.012 | |
| 150°C, 2% H2SO4, 4 min | 5.35 | 0.020 | |
| 160°C, 2% H2SO4, 2 min | 5.76 | 0.022 | |
| 170°C, 2% H2SO4, 1 min | 8.94 | 0.027 | |
| Sugarcane bagasse | untreated | 1.00 | NA |
| 130°C, 2% H2SO4, 5 min | 1.80 | NA | |
| 160°C, 2% H2SO4, 5 min | 2.38 | NA | |
| 190°C, 2% H2SO4, 5 min | 6.31 | NA | |
| 160°C, 2% H2SO4, 10 min | 0.98 | NA | |
| 190°C, 2% H2SO4, 10 min | 5.00 | NA |