Direct measurement of fluorocarbon radicals in the thermal destruction of perfluorohexanoic acid using photoionization mass spectrometry DOI Creative Commons
Minggao Xu,

Chen Yang Huang,

Long Zhao

et al.

Science Advances, Journal Year: 2025, Volume and Issue: 11(9)

Published: Feb. 28, 2025

Thermal destruction is a critical cornerstone of addressing the rampant contamination natural resources with per- and polyfluoroalkyl substances (PFAS). However, grave concerns associated stack emissions from incineration exist because mechanistic studies have thus far relied on ex situ analyses end products theoretical calculations. Here, we used synchrotron-based vacuum ultraviolet photoionization mass spectrometry to study pyrolysis representative PFAS—perfluorohexanoic acid—and provide direct evidence fluorocarbon radicals intermediates. A key reaction pathway perfluorocarboxylic acids ketenes via acyl fluorides proposed. We furthermore propose CF 2 /CF 3 radical–centered mechanisms explain their roles in formation other that may form full-scale incinerators. These results not only unveiled role intermediates thermal PFAS decomposition recombination but also unique insight into improving safety viability industrial incineration.

Language: Английский

Direct measurement of fluorocarbon radicals in the thermal destruction of perfluorohexanoic acid using photoionization mass spectrometry DOI Creative Commons
Minggao Xu,

Chen Yang Huang,

Long Zhao

et al.

Science Advances, Journal Year: 2025, Volume and Issue: 11(9)

Published: Feb. 28, 2025

Thermal destruction is a critical cornerstone of addressing the rampant contamination natural resources with per- and polyfluoroalkyl substances (PFAS). However, grave concerns associated stack emissions from incineration exist because mechanistic studies have thus far relied on ex situ analyses end products theoretical calculations. Here, we used synchrotron-based vacuum ultraviolet photoionization mass spectrometry to study pyrolysis representative PFAS—perfluorohexanoic acid—and provide direct evidence fluorocarbon radicals intermediates. A key reaction pathway perfluorocarboxylic acids ketenes via acyl fluorides proposed. We furthermore propose CF 2 /CF 3 radical–centered mechanisms explain their roles in formation other that may form full-scale incinerators. These results not only unveiled role intermediates thermal PFAS decomposition recombination but also unique insight into improving safety viability industrial incineration.

Language: Английский

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