Table 2.
Elemental analysis and metal content results of pyrolytic carbon black samples.
| CB | CB.H2SO4 | CB.KOH | CB.H2SO4 + KOH | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | ± | SD | Mean | ± | SD | Mean | ± | SD | Mean | ± | SD | |
| Nitrogen (%) | 0.90 | ± | 0.01 | 0.86 | ± | 0.15 | 0.97 | ± | 0.02 | 1.02 | ± | 0.02 |
| Carbon (%) | 79.46 | ± | 0.34 | 86.90 | ± | 1.08 | 70.38 | ± | 1.49 | 60.75 | ± | 0.94 |
| Hydrogen (%) | 0.30 | ± | 0.01 | 0.41 | ± | 0.05 | 0.44 | ± | 0.08 | 0.75 | ± | 0.02 |
| Sulfur (%) | 3.09 | ± | 0.06 | 1.36 | ± | 0.02 | 3.04 | ± | 0.04 | 4.45 | ± | 0.06 |
| Oxygen (%) | 0.70 | ± | 0.01 | 0.97 | ± | 0.06 | 8.79 | ± | 0.05 | 16.06 | ± | 0.39 |
| Cd (mg/kg) | 0.00 | ± | 0.01 | 0.30 | ± | 0.08 | 0.45 | ± | 0.21 | 0.11 | ± | 0.00 |
| Cr (mg/kg) | 8.83 | ± | 0.25 | 6.41 | ± | 0.15 | 9.29 | ± | 0.51 | 5.77 | ± | 0.30 |
| Fe (mg/kg) | 862.47 | ± | 2.50 | 147.93 | ± | 1.14 | 549.67 | ± | 2.15 | 80.98 | ± | 0.61 |
| Ni (mg/kg) | 7.36 | ± | 0.11 | 6.87 | ± | 0.06 | 3.74 | ± | 0.11 | 2.99 | ± | 0.14 |
| Pb (mg/kg) | 4.77 | ± | 0.18 | 1.99 | ± | 0.30 | 6.73 | ± | 0.23 | 3.16 | ± | 0.19 |
| Zn (mg/kg) | 37543.33 | ± | 565.89 | 1990.67 | ± | 4.51 | 8032.67 | ± | 74.90 | 158.13 | ± | 0.72 |
CB: pyrolytic carbon black; CB.H2SO4: carbon black from H2SO4 activation; CB.KOH: carbon black from KOH activation; CB.H2SO4 + KOH: carbon black from H2SO4 and KOH activation. See text for details.