PMID- 37223990
OWN - NLM
STAT- MEDLINE
DCOM- 20231129
LR  - 20240224
IS  - 1520-5851 (Electronic)
IS  - 0013-936X (Print)
IS  - 0013-936X (Linking)
VI  - 57
IP  - 47
DP  - 2023 Nov 28
TI  - Oxidation of Per- and Polyfluoroalkyl Ether Acids and Other Per- and 
      Polyfluoroalkyl Substances by Sulfate and Hydroxyl Radicals: Kinetic Insights 
      from Experiments and Models.
PG  - 18970-18980
LID - 10.1021/acs.est.3c00947 [doi]
AB  - Per- and polyfluoroalkyl substances (PFAS) are widely used anthropogenic 
      chemicals. Because of the strength of the carbon-fluorine bond, PFAS are not 
      destroyed in typical water treatment processes. Sulfate (SO(4)(*-)) and hydroxyl 
      ((*)OH) radicals can oxidize some PFAS, but the behavior of per- and 
      polyfluoroalkyl ether acids (PFEAs) in processes involving SO(4)(*-) and (*)OH is 
      poorly understood. In this study, we determined second-order rate constants (k) 
      describing the oxidation of 18 PFAS, including 15 novel PFEAs, by SO(4)(*-) and 
      (*)OH. Among the studied PFAS, 6:2 fluorotelomer sulfonate reacted most readily 
      with (*)OH [k(*OH) = (1.1-1.2) x 10(7) M(-1) s(-1)], while polyfluoroalkyl ether 
      acids containing an -O-CFH- moiety reacted more slowly [k(*OH) = (0.5-1.0) x 
      10(6) M(-1) s(-1)]. In the presence of SO(4)(*-), polyfluoroalkyl ether acids 
      with an -O-CFH- moiety reacted more rapidly [k(SO4)(*-) = (0.89-4.6) x 10(6) 
      M(-1) s(-1)] than perfluoroalkyl ether carboxylic acids (PFECAs) and a 
      chloro-perfluoro-polyether carboxylic acid (ClPFPECA) [k(SO4)(*-) = (0.85-9.5) x 
      10(4) M(-1) s(-1)]. For homologous series of perfluoroalkyl carboxylic acids, 
      linear and branched monoether PFECAs, and multiether PFECAs, PFAS chain length 
      had little impact on second-order rate constants. SO(4)(*-) reacted with the 
      carboxylic acid headgroup of perfluoroalkyl carboxylic acids and PFECAs. In 
      contrast, for polyfluoroalkyl ether carboxylic and sulfonic acids with an -O-CFH- 
      moiety, the site of SO(4)(*-) attack was the -O-CFH- moiety. Perfluoroalkyl ether 
      sulfonic acids were not oxidized by SO(4)(*-) and (*)OH under the conditions 
      evaluated in this study.
FAU - Zhang, Chuhui
AU  - Zhang C
AUID- ORCID: 0000-0001-9686-0416
AD  - Department of Civil, Construction, and Environmental Engineering, North Carolina 
      State University, Raleigh, North Carolina 27695, United States.
FAU - Tang, Tiffany
AU  - Tang T
AD  - Department of Civil, Construction, and Environmental Engineering, North Carolina 
      State University, Raleigh, North Carolina 27695, United States.
FAU - Knappe, Detlef R U
AU  - Knappe DRU
AUID- ORCID: 0000-0003-1315-1791
AD  - Department of Civil, Construction, and Environmental Engineering, North Carolina 
      State University, Raleigh, North Carolina 27695, United States.
AD  - Center for Human Health and the Environment, North Carolina State University, 
      Raleigh, North Carolina 27695, United States.
LA  - eng
GR  - P42 ES031009/ES/NIEHS NIH HHS/United States
PT  - Journal Article
DEP - 20230524
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (ammonium 2,3,3,3-tetrafluoro-2-(heptafluoropropoxy)-propanoate)
RN  - 0F5N573A2Y (Ether)
RN  - 0 (fluorotelomer sulfonic acids)
RN  - 3352-57-6 (Hydroxyl Radical)
RN  - 0 (Sulfates)
RN  - 0 (Fluorocarbons)
RN  - 0 (Ethers)
RN  - 0 (Sulfonic Acids)
RN  - 0 (Carboxylic Acids)
RN  - 0 (Water Pollutants, Chemical)
SB  - IM
MH  - Ether
MH  - Hydroxyl Radical
MH  - Sulfates
MH  - *Fluorocarbons/analysis
MH  - Ethers
MH  - Sulfonic Acids
MH  - Carboxylic Acids
MH  - *Water Pollutants, Chemical/analysis
PMC - PMC10667564
MID - NIHMS1929684
OTO - NOTNLM
OT  - GenX
OT  - Nafion byproduct 2
OT  - PFAS destruction
OT  - fluoroethers
OT  - photolysis
EDAT- 2023/05/24 19:13
MHDA- 2023/11/29 06:42
PMCR- 2024/02/23
CRDT- 2023/05/24 12:04
PHST- 2023/11/29 06:42 [medline]
PHST- 2023/05/24 19:13 [pubmed]
PHST- 2023/05/24 12:04 [entrez]
PHST- 2024/02/23 00:00 [pmc-release]
AID - 10.1021/acs.est.3c00947 [doi]
PST - ppublish
SO  - Environ Sci Technol. 2023 Nov 28;57(47):18970-18980. doi: 
      10.1021/acs.est.3c00947. Epub 2023 May 24.