Oxidative–reductive photodecomposition of perfluorooctanoic acid in water英文电子书.pdf

Int. J. Environ. Sci. Technol. DOI 10.1007/s13762-013-0312-2 ORIGINAL PAPER Oxidative–reductive photodecomposition of perfluorooctanoic acid in water R. R. Giri • H. Ozaki • X. Guo • R. Takanami • S. Taniguchi Received: 9 January 2013 / Revised: 1 March 2013 / Accepted: 23 April 2013 Islamic Azad University (IAU) 2013 Abstract This article aims to elucidate on usefulness of Keywords Aquated electrons Defluorination vacuum ultraviolet (VUV) for photoreductive degradation Mineralization Oxidation Reduction Vacuum of perfluorooctanoic acid (PFOA), a representative per- ultraviolet fluorinated compound (PFC), in water for the first time. Bench-scale tests were conducted on oxidative and reduc- tive (with aquated electron: e- ) mineralization of PFOA Introduction aq using low-pressure UV (LPUV) lamps and potassium iodide. Unlike with 254 nm wavelength (UVC), the Occurrence of perfluorinated compounds (PFCs) in water reductive mineralization with VUV was very inefficient environment and their negative impacts on aquatic eco- compared to the corresponding oxidative mineralization. system and human health has been a major focal point of The inefficiency is attributed to low reactivity of e- with researchers and scientists particularly in the industrialized aq PFOA and its fluorinated products than that of 185 nm countries for the last several years. Among the PFCs, photons. Direct VUV photolysis of PFOA and its products perfluorooctanoic acid (PFOA) and perfluorooctane sulfo- in reductive reaction conditions was not apparent due to a nate (PFOS) have received more attentions as the com- very