Combined adsorption and electrochemical oxidation of perfluorooctanoic acid (PFOA) using graphite intercalated compound
Article
Trzcinski, Antoine P. and Harada, Kouji. 2024. "Combined adsorption and electrochemical oxidation of perfluorooctanoic acid (PFOA) using graphite intercalated compound." Environmental Science and Pollution Research. 31 (13). https://doi.org/10.1007/s11356-024-32449-0
Article Title | Combined adsorption and electrochemical oxidation of perfluorooctanoic acid (PFOA) using graphite intercalated compound |
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ERA Journal ID | 5827 |
Article Category | Article |
Authors | Trzcinski, Antoine P. and Harada, Kouji |
Journal Title | Environmental Science and Pollution Research |
Journal Citation | 31 (13) |
Number of Pages | 15 |
Year | 2024 |
Publisher | Springer |
Place of Publication | Germany |
ISSN | 0944-1344 |
1614-7499 | |
Digital Object Identifier (DOI) | https://doi.org/10.1007/s11356-024-32449-0 |
Web Address (URL) | https://link.springer.com/article/10.1007/s11356-024-32449-0 |
Abstract | Perfluorooctanoic acid (PFOA) is a bioaccumulative synthetic chemical containing strong C–F bonds and is one of the most common per- and polyfluoroalkyl substances (PFAS) detected in the environment. Graphite intercalated compound (GIC) flakes were used to adsorb and degrade PFOA through electrochemical oxidation. The adsorption followed the Langmuir model with a loading capacity of 2.6 µg PFOA g−1 GIC and a second-order kinetics (3.354 g µg−1 min−1). 99.4% of PFOA was removed by the process with a half-life of 15 min. When PFOA molecules broke down, they released various by-products, such as short-chain perfluoro carboxylic acids like PFHpA, PFHxA, and PFBA. This breakdown indicates the cleavage of the perfluorocarbon chain and the release of CF2 units, suggesting a transformation or degradation of the original compound into these smaller acids. Shorter-chain perfluorinated compounds had slower degradation rates compared to longer-chain ones. Combining these two methods (adsorption and in situ electrochemical oxidation) was found to be advantageous because adsorption can initially concentrate the PFOA molecules, making it easier for the electrochemical process to target and degrade them. The electrochemical process can potentially break down or transform the PFAS compounds into less harmful substances through oxidation or other reactions. |
Keywords | Adsorption |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 401102. Environmentally sustainable engineering |
Byline Affiliations | School of Agriculture and Environmental Science |
Kyoto University, Japan |
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