| Alkali washing treatment with different NaOH concentration (%) | Crystallinity (%) | Crystallite width (nm) |
|---|---|---|
| Without washing | 76 (0.4) | 3.65 (0.02) |
| 1 | 78 (1.2) | 3.66 (0.02) |
| 2 | 79 (2.1) | 3.99 (0.02) |
| 3 | 81 (2.3) | 4.12 (0.03) |
| 4 | 78 (1.1) | 3.68 (0.03) |
| 5 | 78 (1.4) | 3.90 (0.01) |