求翻譯一段英文，謝謝�。。。。。�！

TiO2 as potentially the most efficient and environmentally benign photocatalyst can be used for photodegradation of pollutants. Upon absorption of photons with energy higher than its band gap, the excitation from the valence band to the conduction band creates electron-hole pairs. It is these light-induced carriers that migrate to the surface and degrade the surrounding pollutants in contact. 返回小木蟲查看更多