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← ScienceWhich outcome is observed from ultraviolet radiation of titanium dioxide?
A)Electron-hole separation promotes oxidation✓
B)Band gap narrowing disables photocatalysis
C)Oxygen vacancies prevent charge transfer
D)Surface hydroxylation decreases reduction
💡 Explanation
Electron excitation from valence to conduction bands leaves holes. The mechanism, electron-hole separation, causes strong oxidation and reduction. This reaction occurs because photons striking TiO2 possess sufficient energy to overcome its band gap; therefore oxidation is promoted rather than suppressed because the photons' energy greatly surpasses thermal fluctuations alone.
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