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Citation
Tags
HERO ID
3981286
Reference Type
Journal Article
Title
Reductive defluorination of perfluorooctanoic acid by titanium(III) citrate with vitamin B12 and copper nanoparticles
Author(s)
Lee, YC; Chen, YP; Chen, MJ; Kuo, J; Lo, SL
Year
2017
Is Peer Reviewed?
Yes
Journal
Journal of Hazardous Materials
ISSN:
0304-3894
EISSN:
1873-3336
Volume
340
Page Numbers
336-343
Language
English
PMID
28728112
DOI
10.1016/j.jhazmat.2017.06.020
Web of Science Id
WOS:000409149800035
Abstract
Perfluorooctanoic acid (PFOA) is widespread in the environment, which causes serious health and safety concerns. A mechanistic study on reductive defluorination of PFOA by titanium(III) citrate in the presence of catalysts was conducted. Vitamin B12 was used to catalyze reduction reactions by shuttling electrons from a reducing agent (electron donor) to PFOA to produce a Co-carbon bond intermediates. In the presence of copper nanoparticles, a precursor complex, B12-C7F14COOH, adsorbed on the metal surface, followed by a hydrogenolytic reaction to form less-fluorinated products. The synergistic effect between vitamin B12 and copper nanoparticles enhances the reductive activities by electron-transfer reactions and hydrogenolysis. The efficient reduction of PFOA to less-noxious compounds was demonstrated with a copper dose of 2gL(-1), titanium(III) citrate (45mM), and vitamin B12 (0.2mM) with an initial pH of 9.0 and 70°C. In this anoxic aqueous solution, the biomimetic reductive system effectively removed 65% of PFOA. The mass balance on fluoride matched the observed degradation of PFOA, while no short-chain intermediates were detected.
Keywords
Catalytic defluorination; Perfluorooctanoic acid; Copper nanoparticles; Vitamin B-12; Reductive defluorination
Tags
PFAS
•
Additional PFAS (formerly XAgency)
•
^Per- and Polyfluoroalkyl Substances (PFAS)
PFOA (335-67-1) and PFOS (1763-23-1)
Literature Search – Adverse outcome pathway (2015-present)
Pubmed
•
PFAS 150
Literature Search August 2019
PubMed
Web of Science
Not prioritized for screening
Ammonium perfluorooctanoate
Perfluorooctanoic acid
•
PFNA
Litsearch Update 2017-2018
Pubmed
Literature Search
Pubmed
•
PFOA (335-67-1) and PFOS (1763-23-1)
Literature Search – Adverse outcome pathway (2015-present)
Pubmed
Screening Results
Excluded/Not on Topic
Literature Search Update (2013-2019)
PubMed
WOS
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