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Enhanced photoreductive degradation of perfluorooctanesulfonate by UV irradiation in the presence of ethylenediaminetetraacetic acid

Gu, Pengfei and Zhang, Chaojie and Sun, Zhuyu and Zhang, Haozhen and Zhou, Qi and Lin, Sijie and Rong, Jinyu and Hoffmann, Michael R. (2020) Enhanced photoreductive degradation of perfluorooctanesulfonate by UV irradiation in the presence of ethylenediaminetetraacetic acid. Chemical Engineering Journal, 379 . Art. No. 122338. ISSN 1385-8947. http://resolver.caltech.edu/CaltechAUTHORS:20190729-152446555

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Abstract

Perfluorooctanesulfonate (PFOS) is a persistent organic pollutant (POP) that is globally distributed. Hydrated electrons (e_(aq)–) are known to effectively initiate the decomposition of PFOS. In this study, we explore an alternative photolytic approach employing aquated electrons, e_(aq)– in the presence of ethylenediaminetetraacetic acid (EDTA) in order to enhance the photo-induced degradation of PFOS. EDTA, in this case, serves primarily as a hydroxyl radical scavenger, which inhibits the recombination of e_(aq)– with ∙OH resulting in an increased average photolytic lifetime for e_(aq)–. The net effect is to enhance the degradation of PFOS. UV/EDTA irradiation is shown to increase the overall decomposition percentages of PFOS. The empirical pseudo first-order rate constant for the loss of PFOS is 0.113 h^(-1). In addition, we used laser flash photolysis kinetics to show that the e_(aq)– is the dominant species responsible for the decomposition of PFOS. EDTA also allows for the photolytically-produced hydrated electrons to be used in the presence of air over a wide range of pH. Furthermore, perfluoroalkyl sulfonates with longer chain lengths have higher overall decomposition percentages and increased defluorination percentages. The observed kinetic enhancements appear to be due primarily to the impact of the amine and methylene groups of EDTA with respect of hydroxyl radical scavenging.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.cej.2019.122338DOIArticle
ORCID:
AuthorORCID
Zhang, Chaojie0000-0003-3108-8271
Lin, Sijie0000-0002-6970-8221
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:© 2019 Published by Elsevier B.V. Received 12 April 2019, Revised 23 July 2019, Accepted 25 July 2019, Available online 26 July 2019. The authors gratefully acknowledge Prof. Weiming Zhang and Dr. Bingdang Wu from State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China, for their kind assistance on the LFP result analysis. This study was supported by the National Natural Science Foundation of China (Project No. 21677109), the Fundamental Research Funds for the Central Universities (Project No. 22120180118, No. 22120180247) and the Major Science and Technology Program for Water Pollution Control and Treatment (Project No. 2018ZX 07109-001-03).
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China21677109
Fundamental Research Funds for the Central Universities22120180118
Fundamental Research Funds for the Central Universities22120180247
Major Science and Technology Program for Water Pollution Control and Treatment2018ZX 07109-001-03
Subject Keywords:Perfluorooctanesulfonate; Hydrated electron; Photoreductive degradation; Ethylenediaminetetraacetic acid
Record Number:CaltechAUTHORS:20190729-152446555
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190729-152446555
Official Citation:Pengfei Gu, Chaojie Zhang, Zhuyu Sun, Haozhen Zhang, Qi Zhou, Sijie Lin, Jinyu Rong, Michael R. Hoffmann, Enhanced photoreductive degradation of perfluorooctanesulfonate by UV irradiation in the presence of ethylenediaminetetraacetic acid, Chemical Engineering Journal, Volume 379, 2020, 122338, ISSN 1385-8947, https://doi.org/10.1016/j.cej.2019.122338. (http://www.sciencedirect.com/science/article/pii/S1385894719317413)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97496
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Jul 2019 15:45
Last Modified:03 Sep 2019 16:42

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