链长和官能团对全氟有机酸降解路径的影响

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Abstract Effect of carbon chain length and functional group on decomposition of perfluorinated organic acids by the high intensity UV/sulfite system was investigated in this study. Typical perfluorinated organic acids, such as PFOA and PFOS, were selected to reveal their decomposition mechanisms. The results showed five kinds of perfluorinated organic acids were efficiently decomposed in this system, and their decomposition rate increased with increase of carbon chain length. Functional group played an important role in decomposition of perfluorinated organic acids. Decomposition rate of perfluorocarboxylic acids was obviously faster than perfluorosulfonic acids. Decomposition of perfluorocarboxylic acids started from the fluorine atom at α-position bonding with carboxyl, and then underwent decomposition with stepwise elimination of CF₂ to form short chain perfluorocarboxylic acids. Desulfonation, defluorination at α position and centermost C-C bond scission were three main decomposition pathways of perfluorosulfonic acids.

Key words： perfluorinated organic acids UV/sulfite hydrated electron carbon chain length functional group

Received: 16 December 2019

PACS:

X703

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	Articles by authors
	GU Yu-rong
	LI Xu
	ZHU Jia
	DONG Zi-jun
	LI Xian-li

Cite this article:

GU Yu-rong,LI Xu,ZHU Jia等. Effect of carbon chain length and functional group on decomposition pathway of perfluorinated organic acids[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 2952-2959.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I7/2952

[1]	方淑红,李成,卞玉霞,等.岷江流域全氟化合物的污染特征及排放通量[J]. 中国环境科学, 2019,39(7):2983-2989. Fang S H, Li C, Bian Y X, et al. Pollution characteristics and flux of perfluoroalkyl substances in Minjiang River[J]. China Environmental Science, 2019,39(7):2983-2989.
[2]	Sun Z Y, Zhang C J, Chen P, et al. Impact of humic acid on the photoreductive degradation of perfluorooctane sulfonate (PFOS) by UV/Iodide process[J]. Water Research, 2017,127:50-58.
[3]	Zhang Y Z, Wang B, Wang W, et al. Occurrence and source apportionment of Per-and poly-fluorinated compounds (PFCs) in North Canal Basin, Beijing[J]. Scientific Report, 2016,6:36683.
[4]	Merino N, Qu Y, Deeb R A, et al. Degradation and removal methods for perfluoroalkyl and polyfluoroalkyl substances in water[J]. Environmental Engineering Science, 2016,33:615-649.
[5]	Bentel M J, Yu Y C, Xu L H, et al. Defluorination of per-and polyfluoroalkyl substances (PFASs) with hydrated electrons:structural dependence and implications to PFAS remediation an management[J]. Environmental Science & Technology, 2019,53:3718-3728.
[6]	GuY R, Dong W Y, Luo C, et al. Efficient reductive decomposition of perfluorooctanesulfonate in a high photon flux UV/sulfite system[J]. Environmental Science & Technology, 2016,50(19):10554-10561.
[7]	顾玉蓉,董文艺,董紫君,等.高强UV/SO32-体系高效降解一氯乙酸[J]. 中国环境科学, 2019,39(11):4772-4729. Gu Y R, Dong W Y, Dong Z J, et al. Efficient decomposition of monochloroaceticaid in the high intensity UV/sulfite system[J]. China Environmental Science, 2019,39(11):4772-4729.
[8]	Park H, Vecitis C, Cheng J, et al. Reductive defluorination of aqueous perfluorinated alkyl surfactants:effects of ionic headgroup and chain length[J]. The Journal of Physical Chemistry A, 2009,113(4):690-696.
[9]	Zhuo Q F, Deng S B, Yang B, et al. Degradation of perfluorinated compounds on a boron-doped diamond electrode[J]. Electrochim. Acta, 2012,77:17-22.
[10]	Syracuse Research Corporation, Interactive PhysProp Database[EB/OL]. http://www.syrres.com/esc/physdemo.htm, 2006.
[11]	Qu Y, Zhang C, Chen P, et al. Effect of initial solution pH on photo-induced reductive decomposition of perfluorooctanoic acid[J]. Chemosphere, 2014,107:218-223.
[12]	Song Z, Tang H, Wang N, et al. Reductive defluorination of perfluorooctanoic acid by hydrated electrons in a sulfite-mediated UV photochemical system[J]. Journal of Hazardous Materials, 2013,262:332-338.
[13]	Bentel M J, Yu Y C, Xu L H, et al. Defluorination of per-and polyfluoroalkyl substances (PFASs) with hydrated electrons:structural dependence and implications to PFAs remediation and management[J]. Environmental Science & Technology, 2019,53:3718-3728.
[14]	Hori H, Hayakawa E, Einaga H, et al. Decomposition of environmentally persistent perfluorooctanoic acid in water by photochemical approaches[J]. Environmental Science & Technology, 2004,38(22):6118-6124.
[15]	Song Z, Dong X, Wang N, et al. Efficient photocatalytic defluorination of perfluorooctanoic acid over BiOCl nanosheets via a hole direct oxidation mechanism[J]. Chemical Engineering Journal, 2017,317:925-934.
[16]	Blondel C, Cacciani P, Delsart C, et al. High-resolution determination of the electron affinity of fluorine and bromine using crossed ion and laser beams[J]. Physical Review A, 1989,40(7):3698-3701.
[17]	Combellas C, Kanoufi F, Thiébault A. Reduction of polyfluorinated compounds[J]. The Journal of Physical Chemistry B, 2003,107(39):10894-10905.
[18]	Qu Y, Zhang C, Li F, et al. Photo-reductive defluorination of perfluorooctanoic acid in water[J]. Water Research, 2010,44(9):2939-2947.
[19]	Paul A, Wannere C, Schaefer H. Do linear-chain perfluoroalkanes bind an electron?[J]. The Journal of Physical Chemistry A, 2004, 108(43):9428-9434.
[20]	Lyu X, Li W, Lam P, et al. Insights into perfluorooctane sulfonate photodegradation in a catalyst-free aqueous solution[J]. Scientific Reports, 2015,5:9353.
[21]	Yamamoto T, Noma Y, Sakai S, et al. Photodegradation of perfluorooctane sulfonate by UV irradiation in water and alkaline 2-propanol[J]. Environmental Science & Technology, 2007,41(16):5660-5665.