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Table. 2.

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
New Phys.: Sae Mulli 2023;73:429~436 https://doi.org/10.3938/NPSM.73.429
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