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Relationship Between Reaction Rate of Perfluorocarboxylic Acid Decomposition at a Plasma–Liquid Interface and Adsorbed Amount
Author(s) -
Matsuya Yuriko,
Takeuchi Nozomi,
Yasuoka Koichi
Publication year - 2014
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.22526
Subject(s) - adsorption , perfluorooctanoic acid , decomposition , chemistry , carbon chain , saturation (graph theory) , carbon fibers , plasma , inorganic chemistry , chemical engineering , chromatography , analytical chemistry (journal) , organic chemistry , materials science , physics , mathematics , combinatorics , quantum mechanics , composite number , engineering , composite material
SUMMARY Perfluorooctanoic acid (PFOA: C 7 F 15 COOH) in water is effectively decomposed by plasma generated at a gas–liquid interface. During the decomposition of PFOA, perfluorocarboxylic acids (PFCAs:C n F 2 n + 1COOH ) 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.