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<p>We report the defluorination of the per- and polyfluoroalkyl substances (PFAS) chemical perfluorooctane sulfonate (PFOS) by deep ultraviolet light assisted electrocatalysis, using the industrial thermoelement materials Constantan and Nichrome as anodes. Surface analysis of wire anodes after anodic conditioning in aqueous base, which enabled uptake of incidental iron from the electrolyte, showed the in situ formation of surface nickel–iron (oxy)hydroxides, which are active electrocatalysts for PFOS defluorination. The defluorination activity of Constantan wire was higher than that of Nichrome wire, which was unstable under PFOS defluorination conditions. Constantan wire mesh completely defluorinated PFOS over a 48-hour period, maintaining 85.5% defluorination after 120&#xa0;h. The decrease in PFOS defluorination efficiency was attributed to an increase in charge transfer resistance due to the buildup of transition metal hydroxides, oxyhydroxides, or oxides on the wire surface, rather than anode dissolution. Our results provide necessary mechanistic insights into the stability of commercially widely available nickel alloys for the development of economically viable aqueous PFAS remediation systems.</p>

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Defluorination of Perfluorooctane Sulfonate in Aqueous Solution Electrocatalyzed by Industrial Thermoelement Materials

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Ziyi Meng,
  • Madeleine K. Wilsey,
  • Hashini H. Sithari,
  • Astrid M. Müller

摘要

We report the defluorination of the per- and polyfluoroalkyl substances (PFAS) chemical perfluorooctane sulfonate (PFOS) by deep ultraviolet light assisted electrocatalysis, using the industrial thermoelement materials Constantan and Nichrome as anodes. Surface analysis of wire anodes after anodic conditioning in aqueous base, which enabled uptake of incidental iron from the electrolyte, showed the in situ formation of surface nickel–iron (oxy)hydroxides, which are active electrocatalysts for PFOS defluorination. The defluorination activity of Constantan wire was higher than that of Nichrome wire, which was unstable under PFOS defluorination conditions. Constantan wire mesh completely defluorinated PFOS over a 48-hour period, maintaining 85.5% defluorination after 120 h. The decrease in PFOS defluorination efficiency was attributed to an increase in charge transfer resistance due to the buildup of transition metal hydroxides, oxyhydroxides, or oxides on the wire surface, rather than anode dissolution. Our results provide necessary mechanistic insights into the stability of commercially widely available nickel alloys for the development of economically viable aqueous PFAS remediation systems.