Table 5 Concentration of surface functional groups by Boehm titration.
Activated carbon | Carboxylic groups (mmol/g) | Lactonic groups (mmol/g) | Phenolic groups (mmol/g) | Total acidic sites (mmol/g) | Total basic sites (mmol/g) |
---|---|---|---|---|---|
TAC1 | 0.20 | 0.05 | 0.10 | 0.35 | 0.761 |
TAC2 | 0.30 | 0.00 | 0.35 | 0.65 | 0.217 |
TAC3 | 0.70 | 0.00 | 0.45 | 1.15 | 0.109 |
TAC4 | 0.25 | 0.15 | 0.40 | 0.80 | 0.000 |
TAC5 | 0.50 | 0.00 | 0.35 | 0.85 | 0.000 |
TAC6 | 0.35 | 0.00 | 0.25 | 0.60 | 0.326 |