« Previous AbstractFemale Mice Avoid Male Odor from the Same Strain via the Vomeronasal System in an Estrogen-Dependent Manner    Next AbstractFacile surface modification of textiles with photocatalytic carbon nitride nanosheets and the excellent performance for self-cleaning and degradation of gaseous formaldehyde »

J Hazard Mater

Title:		"The first quantitative investigation of compounds generated from PFAS, PFAS-containing aqueous film-forming foams and commercial fluorosurfactants in pyrolytic processes"
Author(s):		Yao B; Sun R; Alinezhad A; Kubatova A; Simcik MF; Guan X; Xiao F;
Address:		"Department of Civil Engineering, University of North Dakota, 243 Centennial Drive Stop 8115, Grand Forks, ND 58202, United States. Department of Chemistry, University of North Dakota, 151 Cornell Street Stop 9024, Grand Forks, ND 58202, United States. School of Public Health, University of Minnesota, Minneapolis, MN 55455, United States. School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China. Department of Civil Engineering, University of North Dakota, 243 Centennial Drive Stop 8115, Grand Forks, ND 58202, United States. Electronic address: feng.xiao@und.edu"
Journal Title:		J Hazard Mater
Year:		2022
Volume:		20220607
Issue:
Page Number:		129313 -
DOI:		10.1016/j.jhazmat.2022.129313
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"Pyrolysis as a thermochemical technology is commonly used in waste management and remediation of organic-contaminated soil. This study, for the first time, investigated fluorinated and non-fluorinated compounds emitted from per- and polyfluoroalkyl substances (PFAS) and relevant products upon pyrolysis (200-890 degrees C) and their formation mechanisms. Approximately 30 non-fluorinated compounds were detected from PFAS-containing aqueous film-forming foams (AFFFs) and commercial surfactant concentrates (SCs) after heating, including glycols and glycol ethers that were predominant at 200 degrees C. Oxygen (e.g., 1,4-dioxane) and nitrogen heterocycles and benzene were unexpectedly observed at higher temperatures (300-890 degrees C), which were likely formed as a consequence of the thermal dehydration, dehydrogenation, and intermolecular cyclization of glycols and glycol ethers. Fluorinated volatiles in six major classes were detected at low and moderate temperatures (200-500 degrees C), including perfluoroalkenes, perfluoroalkyl aldehydes, fluorotelomer alcohols, and polyfluorinated alkanes/alkenes. Several features of the pyrolyses of PFAS suggest that the underlying decomposition mechanism is radical-mediated. Perfluoroheptene thermally decomposed at 200 degrees C to shorter-chain homologues following a radical chain-scission mechanism. Most of these volatiles observed at low/moderate temperatures were not detected at 890 degrees C. Ultra-short-chain fluorinated greenhouse gases (e.g., perfluoromethane) were not found"
Keywords:		"Ethers *Fluorocarbons/analysis Glycols Pyrolysis Water *Water Pollutants, Chemical/analysis Aromatics and heteroaromatics Cationic and zwitterionic PFAS Perfluoroalkenes Radical-chain reactions Thermal transformation;"
Notes:		"MedlineYao, Bin Sun, Runze Alinezhad, Ali Kubatova, Alena Simcik, Matt F Guan, Xiaohong Xiao, Feng eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Netherlands 2022/06/25 J Hazard Mater. 2022 Aug 15; 436:129313. doi: 10.1016/j.jhazmat.2022.129313. Epub 2022 Jun 7"