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Reductive degradation of perfluoroalkyl compounds with aquated electrons generated from iodide photolysis at 254 nm

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Abstract

The perfluoroalkyl compounds (PFCs), perfluoroalkyl sulfonates (PFXS) and perfluoroalkyl carboxylates (PFXA) are environmentally persistent and recalcitrant towards most conventional water treatment technologies. Here, we complete an in depth examination of the UV-254 nm production of aquated electrons during iodide photolysis for the reductive defluorination of six aquated perfluoroalkyl compounds (PFCs) of various headgroup and perfluorocarbon tail length. Cyclic voltammograms (CV) show that a potential of +2.0 V (vs. NHE) is required to induce PFC oxidation and −1.0 V is required to induce PFC reduction indicating that PFC reduction is the thermodynamically preferred process. However, PFCs are observed to degrade faster during UV(254 nm)/persulfate (S2O82−) photolysis yielding sulfate radicals (E◦ = +2.4 V) as compared to UV(254 nm)/iodide (I-) photolysis yielding aquated electrons (E◦ = −2.9 V). Aquated electron scavenging by photoproduced triiodide (I3−), which achieved a steady-state concentration proportional to [PFOS]0, reduces the efficacy of the UV/iodide system towards PFC degradation. PFC photoreduction kinetics are observed to be dependent on PFC headgroup, perfluorocarbon chain length, initial PFC concentration, and iodide concentration. From 2 to 12, pH had no observable effect on PFC photoreduction kinetics, suggesting that the aquated electron was the predominant reductant with negligible contribution from the H-atom. A large number of gaseous fluorocarbon intermediates were semi-quantitatively identified and determined to account for ~25% of the initial PFOS carbon and fluorine. Reaction mechanisms that are consistent with kinetic observations are discussed.

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Authors and Affiliations

  1. School of Energy Engineering, Kyungpook National University, Daegu, 702-701, Korea

    Hyunwoong Park

  2. School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA

    Chad D. Vecitis

  3. W. M. Keck Laboratories, California Institute of Technology, Pasadena, California, 91125, USA

    Jie Cheng & Michael R. Hoffmann

  4. Environmental Analysis Center, California Institute of Technology, Pasadena, California, 91125, USA

    Nathan F. Dalleska

  5. 3M Environmental Laboratory, 3M Center, Building 260-05-N-17, Maple-wood, Minnesota, 55144-1000, USA

    Brian T. Mader

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  1. Hyunwoong Park
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  2. Chad D. Vecitis
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Correspondence to Hyunwoong Park.

Additional information

Electronic supplementary information (ESI) available: Additional figures regarding the chemical actinometry, cyclic voltammetry, and GC-MS quantification of perfluorooctyl iodide. See DOI: 10.1039/c1pp05270e

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Park, H., Vecitis, C.D., Cheng, J. et al. Reductive degradation of perfluoroalkyl compounds with aquated electrons generated from iodide photolysis at 254 nm. Photochem Photobiol Sci 10, 1945–1953 (2011). https://doi.org/10.1039/c1pp05270e

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  • DOI: https://doi.org/10.1039/c1pp05270e

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