TY - JOUR
T1 - Effect of surfactants on the degradation of perfluorooctanoic acid (PFOA) by ultrasonic (US) treatment
AU - Lin, Jo Chen
AU - Hu, Ching-Yao
AU - Lo, Shang Lien
N1 - Publisher Copyright:
© 2015 Published by Elsevier B.V.
PY - 2016/7/15
Y1 - 2016/7/15
N2 - Abstract Perfluorooctanoic acid (C7F15COOH, PFOA) is an aqueous anionic surfactant and a persistent organic pollutant. It can be easily adsorbed onto the bubble-water interface and both mineralized and degraded by ultrasonic (US) cavitation at room temperature. The aim of this study is to investigate whether the effect of US on the degradation of PFOA in solution can be enhanced by the addition of surfactant. To achieve this aim, we first investigated the addition of a cationic (hexadecyl trimethyl ammonium bromide, CTAB), a nonionic (octyl phenol ethoxylate, TritonX-100), and an anionic (sodium dodecyl sulfate, SDS) surfactant. We found the addition of CTAB to have increased the degradation rate the most, followed by TritonX-100. SDS inhibited the degradation rate. We then conducted further experiments characterizing the removal efficiency of CTAB at varying surfactant concentrations and solution pHs. The removal efficiency of PFOA increased with CTAB concentration, with the efficiency reaching 79% after 120 min at 25°C with a 0.12 mM CTAB dose.
AB - Abstract Perfluorooctanoic acid (C7F15COOH, PFOA) is an aqueous anionic surfactant and a persistent organic pollutant. It can be easily adsorbed onto the bubble-water interface and both mineralized and degraded by ultrasonic (US) cavitation at room temperature. The aim of this study is to investigate whether the effect of US on the degradation of PFOA in solution can be enhanced by the addition of surfactant. To achieve this aim, we first investigated the addition of a cationic (hexadecyl trimethyl ammonium bromide, CTAB), a nonionic (octyl phenol ethoxylate, TritonX-100), and an anionic (sodium dodecyl sulfate, SDS) surfactant. We found the addition of CTAB to have increased the degradation rate the most, followed by TritonX-100. SDS inhibited the degradation rate. We then conducted further experiments characterizing the removal efficiency of CTAB at varying surfactant concentrations and solution pHs. The removal efficiency of PFOA increased with CTAB concentration, with the efficiency reaching 79% after 120 min at 25°C with a 0.12 mM CTAB dose.
KW - Critical micelle concentration
KW - Hexadecyl trimethyl ammonium bromide
KW - Perfluorooctanoic acid
KW - Surfactants
KW - Ultrasonic
KW - Critical micelle concentration
KW - Hexadecyl trimethyl ammonium bromide
KW - Perfluorooctanoic acid
KW - Surfactants
KW - Ultrasonic
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U2 - 10.1016/j.ultsonch.2015.07.007
DO - 10.1016/j.ultsonch.2015.07.007
M3 - Article
AN - SCOPUS:84937598076
SN - 1350-4177
VL - 28
SP - 130
EP - 135
JO - Ultrasonics Sonochemistry
JF - Ultrasonics Sonochemistry
M1 - 2941
ER -