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Cited by 103

The DOI matches its Crossref record; 5 of the 5 references it cites were found in a registry or an index.

Perfluorooctanesulfonate Degrades in a Laccase-Mediator System

Luo, Qi, Yan, Xiufen, Lu, Junhe, Huang, Qingguo·2018·Environmental Science & Technology
DOI 10.1021/acs.est.8b00839
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Abstract

Perfluorooctanesulfonate (PFOS) is a compound that has wide applications with extreme persistence in the environment and the potential to bioaccumulate, and could induce adverse effects to ecosystems. We investigated the degradation of PFOS by laccase-induced enzyme catalyzed oxidative humification reactions (ECOHRs) using 1-hydroxybenzotriazole (HBT) as a mediator. Approximately 59% of PFOS was transformed over 162 days of incubation, and the reaction appeared to follow a pseudo-first-order model with reaction rate constant of 0.0066/ d ( r 2 = 0.87) under one condition tested. Using differential absorption spectra and theoretical simulation, we elucidated the interaction between Cu 2+ /Mg 2+ and PFOS, and proposed that Cu 2+ and Mg 2+ could serve as a bridge to bring the negatively charged PFOS and laccase to proximity, thus increasing the chance of radicals that are released from laccase to reach and react with PFOS. In addition, density functional theory modeling showed that PFOS complexation to the metal ions could unlock its helical configuration and decrease the C-C bond energy of PFOS. These changes allow the attack of PFOS C-C backbone by radicals to become easier. On the basis of products identification, we proposed that direct attack of PFOS by the HBT radical initiated the free radical chain reaction processes and led to the formation of fluoride and partially fluorinated compounds. These results suggest that ECOHR is a potential pathway by which PFOS could be deg…

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Metadata

Authors
Luo, Q., Yan, X., Lu, J., & Huang, Q.
Affiliations
  • Interdisciplinary Toxicology Program, Department of Crop and Soil Sciences, University of Georgia, Griffin, Georgia 30223, United States
  • Department of Environmental Science and Engineering, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
ORCID
Venue
Environmental Science & Technology
Publisher
American Chemical Society (ACS)
Published
2018-08-27
Volume
52
Issue
18
Pages
10617-10626
ISSN
  • 0013-936X
  • 1520-5851
DOI
10.1021/acs.est.8b00839
Cited by
103
References
5
Language
en
Funders
  • Air Force Civil Engineer Center (FA8903-12-C-0005)
  • U.S. Department of Defense (ER-2127, W912HQ-11-C-0022)

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