| Activated carbon number | Preparation |
| 650-0 | Pyrolyzed at 650°C, sieved, washed with water, and dried at 80°C | 650-1 | KOH impregnation ratio 1:1, dried at 80°C. Pyrolyzed at 650°C for 1 h, sieved, washed with water to neutrality, and dried at 80°C | 650-2 | KOH impregnation ratio 1:2, dried at 80°C. Pyrolyzed at 650°C for 1h, sieved, pickled for 12 h, washed with water to neutrality, and dried at 80°C | 750-1 | KOH impregnation ratio 1:1, dried at 80°C. Pyrolyzed at 750 °C for 1 h, sieved, washed with water to neutrality, and dried at 80°C. | 750-2 | KOH impregnation ratio 1:2, dried at 80°C. Pyrolyzed at 750°C for 1 h, sieved, pickled for 12 h, washed with water to neutrality, and dried at 80°C. |
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