Abstract
The photocatalytic C F bond cleavage in pentafluorobenzoic acid (PFBA) with ZnO using UV-C light has been investigated under different conditions. Strong C F bond is completely cleaved with ZnO under 150 min of UV-C light irradiation. The defluoridation is more with UV/ZnO process than with UV/TiO 2 process at pH 5. The oxidants such as IO 4 −, BrO 3 −, S 2O 8 2− and ClO 3 − ions enhance the defluoridation rate of PFBA. On the contrary the addition of H 2O 2 decreases the rate. The order of their activities is IO 4 − > S 2O 8 2− > BrO 3 − > ClO 3 −. The C F cleavage is also influenced by the addition of inorganic anions and metal ions. The GC–MS analysis of PFBA solution after irradiation with ZnO reveals the formation of pentafluorobenzene, pentafluorophenol and tetrafluoroquinone as intermediates.
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