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Electrochemical oxidation of PFOA and PFOS in landfill leachates at low and highly boron-doped diamond electrodes
Abstract
Polyfluorinated alkyl substances (PFASs) may reach landfill leachates (LLs) due to improper waste management. In this study perfluorooctanoate (PFOA) and perfluorooctane sulphonate (PFOS) were used as representatives of PFASs in the decomposition on boron-doped diamond electrodes (BDDs) with high (10k ppm) and low (0.5k ppm) boron doping concentrations. The result shows that although better COD removal efficacies are obtained on the low-doped BDD (59 % after 8 h), the decomposition rate of PFOA and PFOS was not affected by boron doping. In LLs, at the current density of 75 mA/cm2, averaged removal efficiencies of 80 % and 78 % were achieved for PFOA and PFOS, respectively. But besides concentration of mother compounds, the presence of intermediates during electrolysis should be monitored. After 8 h of LL electrolysis, the presence of long-chain degradates C6 F13 and C6 F13 COO˗ was still observed only in 10k BDD-PFOA assays, while during 0.5k assays C 6F13 and C6 F13 COO˗ form more intesively at the beginning of the process. This indirectly confirms the more intensive generation of perfluoroalkoxy and hydroxyl radicals and higher susceptibility to electrolysis of PFOA’s long-chain intermediates on 0.5k BDD. This is the first study reporting BDD-electrolysis as promising in PFAS removal from the complex matrix of LLs, despite the oxidation of competing LLs components.
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Authors (7)
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Mattia Pierpaoli dr
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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JOURNAL OF HAZARDOUS MATERIALS
no. 403,
ISSN: 0304-3894 - Language:
- English
- Publication year:
- 2020
- Bibliographic description:
- Pierpaoli M., Szopińska M., Wilk B., Sobaszek M., Łuczkiewicz A., Bogdanowicz R., Fudala-Książek S.: Electrochemical oxidation of PFOA and PFOS in landfill leachates at low and highly boron-doped diamond electrodes// JOURNAL OF HAZARDOUS MATERIALS -Vol. 403, (2020), s.123606-
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.jhazmat.2020.123606
- Sources of funding:
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- Project Efektywne usuwanie mikrozanieczyszczeń ze ścieków przy użyciu elektrochemicznego utleniania na nanokrystalicznych anodach diamentowych (DIAOPS)
- Polish National Agency for Academic Exchange (NAWA), under the Ulam program, Agreement no. PPN/ULM/2019/1/00061/DEC/1 (M.Pierpaoli).
- Verified by:
- Gdańsk University of Technology
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