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Factors controlling the rate of perfluorooctanoic acid degradation in laccase-mediator systems: The impact of metal ions

Luo, Qi, Wang, Zunyao, Feng, Mingbao, Chiang, Dora, Woodward, David, Liang, Shangtao, Lu, Junhe, Huang, Qingguo·2017·Environmental Pollution
DOI 10.1016/j.envpol.2017.02.050
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Abstract

This study investigated the factors that regulated the degradation of perfluorooctanoic acid (PFOA) in laccase-catalyzed oxidative humification reactions with 1-hydroxybenzotriazole (HBT) as a mediator. The reaction rates were examined under conditions with key factors varied, including initial PFOA concentrations, laccase and HBT dosages, and the ionic contents of the reaction solutions. The PFOA degradation followed pseudo-first order kinetics, and the rate constants (k) were similar for the high (100 μmol L -1 ) and low (1.00 μmol L -1 ) initial PFOA concentrations, respectively at 0.0040 day -1 (r 2 = 0.98) and 0.0042 day -1 (r 2 = 0.86) under an optimum reaction condition tested in this study. The metal ions contained in the reaction solution appeared to have a strong impact on PFOA degradation. Differential UV-Vis spectrometry revealed that Cu 2+ can complex with PFOA, which plays an essential role to enable PFOA degradation, probably by bridging the negatively charged PFOA and laccase, so that the free radicals of HBT that are released from laccase can reach and react with PFOA. It was also found that Fe 3+ plays a similar role as Cu 2+ to enable PFOA degradation in the laccase-HBT reaction system. In contrast, Mg 2+ and Mn 2+ cannot complex with PFOA under the investigated conditions, and do not enable PFOA degradation in the laccase-HBT system. Fluoride and partially fluorinated compounds were detected as PFOA degradation products using ion chromatography and high re…

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Metadata

Authors
Luo, Q., Wang, Z., Feng, M., Chiang, D., Woodward, D., Liang, S., Lu, J., & Huang, Q.
ORCID
Wang, Zunyao
Venue
Environmental Pollution
Publisher
Elsevier BV
Published
2017-05
Volume
224
Pages
649-657
ISSN
0269-7491
DOI
10.1016/j.envpol.2017.02.050
Cited by
34
References
6
Language
en
Licence
Funders
  • U.S. Department of Defense (SERDP ER-2127, W912HQ-11-C-0022)
  • U.S. Air Force Civil Engineering Center (FA8903-12-C-0005)
  • NSFC (51178224)

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CoChat. (2026). Citation check: Factors controlling the rate of perfluorooctanoic acid degradation in laccase-mediator systems: The impact of metal ions. https://app.cochat.ai/papers/10.1016/j.envpol.2017.02.050
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Luo, Q., Wang, Z., Feng, M., Chiang, D., Woodward, D., Liang, S., Lu, J., & Huang, Q. (2017). Factors controlling the rate of perfluorooctanoic acid degradation in laccase-mediator systems: The impact of metal ions. Environmental Pollution. https://doi.org/10.1016/j.envpol.2017.02.050