Relative contents (%) of oxygen-containing functional groups obtained from O1s spectra curve fitting.
Sample | Carbonyl oxygen (531.3 eV) | Hydroxyl oxygen (532.7 eV) | Carboxyl oxygen (533.9 eV) | Absorbed water (535.5 eV) |
---|---|---|---|---|
Non-treated | 52.14 | 35.41 | 5.10 | 7.35 |
HNO3 treated | 47.82 | 41.52 | 8.40 | 2.26 |