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| Element (EDX atomic%) | O/C | Surface DS | |||||
|---|---|---|---|---|---|---|---|
| C | O | S | N | This study | Faugeras et al.22 | ||
| KFT-Raw | 59.7 | 40.2 | — | — | 0.67 | — | — |
| KFT-NaOH | 57.5 | 41.4 | — | — | 0.72 | — | — |
| KFT-Pr | 74.0 | 25.9 | — | — | 0.35 | 1.52 | 1.32 |
| KFT-Ts | 75.8 | 19.2 | 4.8 | — | 0.25 | 1.68 | 0.60 |
| KFT-Az | 63.5 | 24.7 | 0.2 | 11.5 | 0.39 | 1.09 | 0.22 |
