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UV/nitrilotriacetic acid process as a novel strategy for efficient photoreductive degradation of perfluorooctanesulfonate

Sun, Zhuyu and Zhang, Chaojie and Xing, Lu and Zhou, Qi and Dong, Wenbo and Hoffmann, Michael Robert (2019) UV/nitrilotriacetic acid process as a novel strategy for efficient photoreductive degradation of perfluorooctanesulfonate. In: 257th ACS National Meeting & Exposition, 31 March-4 April 2019, Orlando, FL.

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Perfluorooctanesulfonate (PFOS) is a toxic, bioaccumulative and highly persistent anthropogenic chem. Hydrated electrons ( e(aq)(-) ) are potent nucleophiles that can effectively decomp. PFOS. In previous studies, e(aq)(-) are mainly produced by photoionization of aq. anions or arom. compds. In this study, we proposed a new photolytic strategy to generate e(aq)(-) and in turn decomp. PFOS, which utilizes nitrilotriacetic acid (NTA) as a photosensitizer to induce water photodissocn. and photoionization, and subsequently as a scavenger of hydroxyl radical ((OH)-O-center dot) to minimize the geminate recombination between (OH)-O-center dot and e(aq)(-) . The net effect is to increase the amt. of e(aq)(-) available for PFOS degrdn. The UV/NTA process achieved a high PFOS degrdn. ratio of 85.4% and a defluorination ratio of 46.8% within 10 h. A pseudo first-order rate const. (k) of 0.27 h^(-1) was obtained. The laser flash photolysis study indicates that e(aq)(-) is the dominant reactive species responsible for PFOS decompn. The generation of e(aq)(-) is greatly enhanced and its half-life is significantly prolonged in the presence of NTA. The ESR (ESR) measurement verified the photodissocn. of water by detecting (OH)-O-center dot. The model compd. study indicates that the acetate and amine groups are the primary reactive sites.

Item Type:Conference or Workshop Item (Paper)
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Zhang, Chaojie0000-0003-3108-8271
Hoffmann, Michael Robert0000-0001-6495-1946
Additional Information:© 2019 American Chemical Society.
Record Number:CaltechAUTHORS:20190830-092221461
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98364
Deposited By: Tony Diaz
Deposited On:30 Aug 2019 16:29
Last Modified:03 Mar 2020 13:01

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