Relationship Between Reaction Rate of Perfluorocarboxylic Acid Decomposition at a Plasma-Liquid Interface and Adsorbed Amount

SUMMARY Perfluorooctanoic acid (PFOA: C7F15COOH) in water is effectively decomposed by plasma generated at a gas–liquid interface. During the decomposition of PFOA, perfluorocarboxylic acids (PFCAs: CnF2n+1 COOH ) with shorter carbon chains (n = 1–6) are generated as by‐products. Since these PFCAs a...

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Bibliographic Details
Published in:Electrical engineering in Japan 2014-07, Vol.188 (2), p.1-8
Main Authors: Matsuya, Yuriko, Takeuchi, Nozomi, Yasuoka, Koichi
Format: Article
Language:English
Subjects:
adsorption
Byproducts
Carbon
Decomposition
Discharge
Electrical engineering
perfluorooctanoic acid (PFOA)
plasma
Saturation
Surface chemistry
surfactant
Surfactants
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Summary:SUMMARY Perfluorooctanoic acid (PFOA: C7F15COOH) in water is effectively decomposed by plasma generated at a gas–liquid interface. During the decomposition of PFOA, perfluorocarboxylic acids (PFCAs: CnF2n+1 COOH ) with shorter carbon chains (n = 1–6) are generated as by‐products. Since these PFCAs are surfactants, they are adsorb onto the gas–liquid interface and show high surface concentrations. This study investigated the relationship between the adsorbed amount of PFCA and the rate of decomposition by a direct current plasma. The adsorbed amount of PFCA at the gas–liquid interface increased as the length of the carbon chain increased, resulting in a higher rate of decomposition. However, the reaction rate reached saturation at a certain adsorption amount, depending on the discharge current.
ISSN:0424-7760
1520-6416
DOI:10.1002/eej.22526