Photochemical transformation of perfluoroalkyl acid precursors in water using engineered nanomaterials

Abstract

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Perfluoroalkyl Acid-Functionalized Aluminum Nanoparticles for Fluorine Fixation and Energy Generation

“…It is resulted from the better thermal stability of short-chain PFAAs since the decomposition initiates from skeleton chain breakage. 30 Moreover, the main reaction during the combustion is the association of Al with CF n free radicals generated from initial pyrolysis, 18 which provides a faster and more complete defluorination for long-chain PFAAs. An exception is the FF R of nAl/PFGA in N 2 , which is higher than that of nAl/PFBA.…”

Photo-chemical/catalytic oxidative/reductive decomposition of per- and poly-fluoroalkyl substances (PFAS), decomposition mechanisms and effects of key factors: a review

“…Further, with the great potential of nanoparticles as catalysts for water purification, Dai et al 140 studied the photochemical transformation of perfluoroalkyl acid precursors (PrePFAAs) in the presence of six engineered nanomaterials (ENMs) under simulated sunlight. n TiO 2 , n ZnO, n Fe 2 O 3 , n CuO, graphene oxide (GO), and multi-walled carbon nanotubes (MWCNTs) were the studied ENMs.…”

“…Thus, the addition of ENMs increased transformation rates of 8 : 2 FTSA and 8 : 2 FTOH by 2–6 times, whereas most ENMs showed adverse effects on the transformation of SAmPAP. 140…”

“…In the next work of the same research group, 138 another aspect of the application of adsorptive photocatalysts was reported in the decomposition of a mixture of PFAS in landfill leachate. Despite the strong matrix effect, in pilot-scale tests, Fe/TNTs@AC exhibited good adsorption selectivity and removed >92% of 18 PFAS in 8 h, and degraded an average of 84% of 16 PFAS within 72 h. 138 Further, with the great potential of nanoparticles as catalysts for water purification, Dai et al 140 studied the photochemical transformation of perfluoroalkyl acid precursors (PrePFAAs) in the presence of six engineered nanomaterials (ENMs) under simulated sunlight. nTiO 2 , nZnO, nFe 2 O 3 , nCuO, graphene oxide (GO), and multi-walled carbon nanotubes (MWCNTs) were the studied ENMs.…”

“…Thus, the addition of ENMs increased transformation rates of 8 : 2 FTSA and 8 : 2 FTOH by 2-6 times, whereas most ENMs showed adverse effects on the transformation of SAmPAP. 140 Table 1 presents a summary of experimental conditions and the effectiveness of photo-chemical/catalytic oxidative processes. In general, the addition of mediators enhances decomposition Environmental Science: Water Research & Technology Critical review and defluorination efficiencies where the former is commonly greater than the latter, implying the formation of F-containing intermediates in the process of PFAS degradation.…”