Abstract
The photochemical decomposition of perfluorodecanoic acid (PFDeA) in water in the presence of persulfate ion (S 2O 8 2−) and sulfur ion (S 2−) was investigated under vacuum ultraviolet (VUV) light irradiation. PFDeA was decomposed under VUV light irradiation. With the addition of S 2O 8 2− or S 2−, the photo-decomposition and defluorination of PFDeA were enhanced significantly. Sulfate radical anion (SO 4 − ) generated from photolysis of S 2O 8 2− initiated PFDeA oxidation. While the S 2− ion, acting as a OH scavenger, enhanced the role of reduction pathway induced by aqueous electrons (e aq −). The shorter-chain perfluorocarboxylic acids (PFCAs), formed in a stepwise manner from longer-chain PFCAs, were identified as products by HPLC/MS.
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