PMID: 16509356Mar 3, 2006Paper

Efficient decomposition of environmentally persistent perfluorooctanesulfonate and related fluorochemicals using zerovalent iron in subcritical water

Environmental Science & Technology
Hisao HoriRyuichi Arakawa

Abstract

Decomposition of perfluorooctanesulfonate (PFOS) and related chemicals in subcritical water was investigated. Although PFOS demonstrated little reactivity in pure subcritical water, addition of zerovalent metals to the reaction system enhanced the PFOS decomposition to form F-ions, with an increasing order of activity of no metal approximately equal Al < Cu < Zn < Fe. Use of iron led to the most efficient PFOS decomposition: When iron powder was added to an aqueous solution of PFOS (93-372 microM) and the mixture was heated at 350 degrees C for 6 h, PFOS concentration in the reaction solution fell below 2.2 microM (detection limit of HPLC with conductometric detection), with formation of F-ions with yields [i.e., (moles of F- formed)/(moles of fluorine content in initial PFOS) x 100] of 46.2-51.4% and without any formation of perfluorocarboxylic acids. A small amount of CHF3 was detected in the gas phase with a yield [i.e., (moles of CHF3)/(moles of carbon content in initial PFOS) x 100] of 0.7%, after the reaction of PFOS (372 microM) with iron at 350 degree C for 6 h. Spectroscopic measurements indicated that PFOS in water markedly adsorbed on the iron surface even at room temperature, and the adsorbed fluorinated species on ...Continue Reading

References

May 10, 2002·Environmental Science & Technology·John P Giesy, Kurunthachalam Kannan
Dec 3, 2004·Environmental Science & Technology·Hisao HoriRyuichi Arakawa
Jun 2, 2005·Environmental Science & Technology·Hiroshi MoriwakiYasuaki Maeda

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Citations

Oct 22, 2008·Analytical and Bioanalytical Chemistry·C NerínR Batlle
Jan 8, 2010·Archives of Environmental Contamination and Toxicology·Natalia QuineteRolf-Dieter Wilken
Mar 16, 2013·Archives of Environmental Contamination and Toxicology·Sachi TaniyasuNobuyoshi Yamashita
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