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PreprintCC BY-NCChemRxiv

Recycling of PFAS using magnesium through mechanochemical process

  • Masashi Hattori1,2
  • Kouki Nagano3,2
  • Moe Fujishiro4
  • Kanako Inoo4
  • Yosuke Kishikawa4
  • Zhengyu Zhao3,2
  • Norio Shibata3,2
4 affiliations
  1. 1Department of Nanopharmaceutical Sciences
  2. 2Nagoya Institute of Technology, Gokiso
  3. 3Department of Life Science and Applied Chemistry
  4. 4Technology and Innovation Center, DAIKIN Industries, Ltd, 1-1 Nishi-Hitotsuya, Settsu, Osaka, Japan
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Abstract

Per- and polyfluoroalkyl substances (PFAS) are widely used a class of organofluorine compounds whose high chemical and thermal stability has motivated the development of strategies for their chemical conversion and fluorine recovery from the perspective of effective fluorine resource utilization. Herein, we report a mechanochemical strategy for the recovery and utilization of fluorine using alkaline-earth metals. Mechanochemical treatment of polytetrafluoroethylene (PTFE) with Mg rapidly converted the fluoropolymer into MgF2, and the method was extended to various PFAS. We further established a method for converting poorly soluble MgF2 into water-soluble NaF by ball milling with NaOH. The poorly water soluble Mg(OH)2 formed during this conversion, which enabled the selective recovery of NaF without additional metal oxide additives. These two transformations were subsequently integrated into a single-step process, enabling the direct conversion of fluoropolymers and perfluoroalkanes into water-soluble and reaildy usable NaF under mechanochemical conditions. The recovered NaF was directly utilized as a fluoride source for one-pot fluorination reactions of sulfonyl chlorides and acyl chlorides, affording the corresponding fluorinated products. This protocol was also scaled up, highlighting important considerations for reaction scale and operational safety. This study provides a useful approach to recovering PFASderived fluorine as a reusable fluoride source and demonstrates its potential for the circular utilization of fluorine resources.

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Cite

BibTeXRIS
BibTeX
@misc{hattori2026recycling,
  title = {{Recycling of PFAS using magnesium through mechanochemical process}},
  author = {Masashi Hattori and Kouki Nagano and Moe Fujishiro and Kanako Inoo and Yosuke Kishikawa and Zhengyu Zhao and Norio Shibata},
  howpublished = {ChemRxiv},
  year = {2026},
  month = oct,
  doi = {10.26434/chemrxiv.15010532/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010532/v1},
  note = {CC BY-NC},
}
RIS
TY  - UNPB
TI  - Recycling of PFAS using magnesium through mechanochemical process
AU  - Masashi Hattori
AU  - Kouki Nagano
AU  - Moe Fujishiro
AU  - Kanako Inoo
AU  - Yosuke Kishikawa
AU  - Zhengyu Zhao
AU  - Norio Shibata
PY  - 2026
DA  - 2026/10/15
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15010532/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010532/v1
AB  - Per- and polyfluoroalkyl substances (PFAS) are widely used a class of organofluorine compounds whose high chemical and thermal stability has motivated the development of strategies for their chemical conversion and fluorine recovery from the perspective of effective fluorine resource utilization. Herein, we report a mechanochemical strategy for the recovery and utilization of fluorine using alkaline-earth metals. Mechanochemical treatment of polytetrafluoroethylene (PTFE) with Mg rapidly converted the fluoropolymer into MgF2, and the method was extended to various PFAS. We further established a method for converting poorly soluble MgF2 into water-soluble NaF by ball milling with NaOH. The poorly water soluble Mg(OH)2 formed during this conversion, which enabled the selective recovery of NaF without additional metal oxide additives. These two transformations were subsequently integrated into a single-step process, enabling the direct conversion of fluoropolymers and perfluoroalkanes into water-soluble and reaildy usable NaF under mechanochemical conditions. The recovered NaF was directly utilized as a fluoride source for one-pot fluorination reactions of sulfonyl chlorides and acyl chlorides, affording the corresponding fluorinated products. This protocol was also scaled up, highlighting important considerations for reaction scale and operational safety. This study provides a useful approach to recovering PFASderived fluorine as a reusable fluoride source and demonstrates its potential for the circular utilization of fluorine resources.
ER  -