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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 11, No. 5, 2014, pp. 1277-1284
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Bioline Code: st14125
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 11, No. 5, 2014, pp. 1277-1284
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Oxidative–reductive photodecomposition of perfluorooctanoic acid in water
Giri, R.R.; Ozaki, H.; Guo, X.; Takanami, R. & Taniguchi, S.
Abstract
This article aims to elucidate on usefulness of
vacuum ultraviolet (VUV) for photoreductive degradation
of perfluorooctanoic acid (PFOA), a representative perfluorinated
compound (PFC), in water for the first time.
Bench-scale tests were conducted on oxidative and reductive
(with aquated electron: eaq
–) mineralization of PFOA
using low-pressure UV (LPUV) lamps and potassium
iodide. Unlike with 254 nm wavelength (UVC), the
reductive mineralization with VUV was very inefficient
compared to the corresponding oxidative mineralization.
The inefficiency is attributed to low reactivity of eaq
– with
PFOA and its fluorinated products than that of 185 nm
photons. Direct VUV photolysis of PFOA and its products
in reductive reaction conditions was not apparent due to a
very big difference in reactivity of 185 and 254 nm photons
with iodide. The results demonstrated that highly
energetic VUV photons are not suitable for photoreductive
degradations of PFCs involving eaq
–, but they can be best
used for oxidative degradations. These findings should
serve as an important reference on VUV usage to decompose
refractory micropollutants.
Keywords
Aquated electrons; Defluorination; Mineralization; Oxidation; Reduction; Vacuum ultraviolet
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