Photocatalytic decomposition of l-phenylalanine over TiO2: Identification of intermediates and the mechanism of photodegradation

▶ UV-A excitation of TiO2 particles induces concerted electron transfers. ▶ Electron transfers lead to the release of NH3 and CO2. ▶ Anaerobic photocatalytic performance results in hydroxylation of aromatic ring. ▶ Hydroxylated intermediates are identified. ▶ Aromatic ring opening occurs in aerobic conditions.