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Photoinduced Reductive Decomposition of Perflurooctanoic Acid in Water: Effect of Temperature and Ionic Strength

Zhang, Chaojie and Qu, Yan and Zhao, Xiaoyun and Zhou, Qi (2015) Photoinduced Reductive Decomposition of Perflurooctanoic Acid in Water: Effect of Temperature and Ionic Strength. CLEAN - Soil, Air, Water, 43 (2). pp. 223-228. ISSN 1863-0650. https://resolver.caltech.edu/CaltechAUTHORS:20150310-103047376

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Abstract

Aqueous photo-reductive decomposition of perflurooctanoic acid (PFOA) was investigated as a function of temperature (293, 298, and 313 K) and ionic strength (2.5, 5.0, or 20.0 mmol/L as NaCl). As an advanced reduction process, iodide was used under UV irradiation to produce highly reactive reducing reagent hydrated electrons. PFOA was reduced by hydrated electrons and short-chain perfluorinated acid intermediates including perfluoroheptanoic acid, perfluorohexanoic acid, perfluoropentanoic acid, perfluorobutyric acid, pentafluoropropionic acid, and trifluoroacetic acid were detected during the reaction. In this study, the same intermediates were observed under different temperature and ionic strength conditions. It was found that the increase of reaction temperature could positively affect the decomposition of PFOA. Defluorination of PFOA was observed to increase as the temperature increased. After 6 h, the defluorination efficiency increased from 47.71% to 80.91% when the system temperature increased from 293 to 313 K. As the temperature increased, the maximum concentration of the six short-chain perfluorinated acid intermediates decreased. Meanwhile, there was a positive correlation between the ionic strength and PFOA decomposition rate. According to the Brønsted–Bjerrum equation, Z_A Z_B was calculated to be 2.2, indicating that both single-charged and double-charged species play a role during the decomposition process.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/clen.201300869 DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/clen.201300869/abstractPublisherArticle
ORCID:
AuthorORCID
Zhang, Chaojie0000-0003-3108-8271
Additional Information:© 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. November 24, 2013; revised: January 21, 2014; accepted: January 30, 2014. This study has been supported by the National Science Foundation Committee of PR China (Project No. 20807032). The authors have declared no conflict of interest.
Funders:
Funding AgencyGrant Number
National Science Foundation Committee of PR China20807032
Subject Keywords:Defluorination mechanism; Hydrated electrons; Thermodynamics; UV-irradiation
Issue or Number:2
Record Number:CaltechAUTHORS:20150310-103047376
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150310-103047376
Official Citation:Zhang, C., Qu, Y., Zhao, X. and Zhou, Q. (2015), Photoinduced Reductive Decomposition of Perflurooctanoic Acid in Water: Effect of Temperature and Ionic Strength. Clean Soil Air Water, 43: 223–228. doi: 10.1002/clen.201300869
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55666
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Mar 2015 18:30
Last Modified:09 Mar 2020 13:19

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