Fig. 3: PFAS destruction and fluorinating reagents from PFAS.

a, Scope of PFAS destruction. The total yield of released fluoride (both F⁻ and PO₃F²⁻) and their ratio were determined by quantitative ¹⁹F NMR spectroscopy (in 10% D₂O in H₂O using NaOTf as an internal standard). Reactions were performed in triplicates, and average yields are reported. b, Synthesis of KF and tetraalkylammonium fluoride from PTFE and other PFAS sources under mechanochemical conditions. Yields of isolated products are reported. ^aReaction was performed once. ^bThe yield was calculated on the basis of the fluorine content of the copolymer as determined by elemental analysis. ^cThe amount of K₃PO₄ was increased to 2 equiv. per F. ^dReaction was carried out for 6 h. quant., quantitative; r.t., room temperature; TMAOH, tetramethylammonium hydroxide; TBAOH, tetrabutylammonium hydroxide.