Effect of surfactants on the degradation of perfluorooctanoic acid (PFOA) by ultrasonic (US) treatment
Journal
Ultrasonics Sonochemistry
Journal Volume
28
Pages
130-135
Date Issued
2016
Author(s)
Abstract
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. © 2015 Published by Elsevier B.V.
Subjects
Critical micelle concentration; Hexadecyl trimethyl ammonium bromide; Perfluorooctanoic acid; Surfactants; Ultrasonic
Other Subjects
Critical micelle concentration; Degradation; Efficiency; Organic pollutants; Sulfur compounds; Surface active agents; Ultrasonics; Water treatment; Degradation rate; Hexadecyl trimethyl ammonium bromide; Nonionic; Perfluorooctanoic acid; Persistent organic pollutant (POP); Removal efficiencies; Surfactant concentrations; Water interface; Sodium dodecyl sulfate; cetrimide; dodecyl sulfate sodium; perfluorooctanoic acid; surfactant; triton x 100; Article; bioremediation; chemical analysis; concentration (parameters); controlled study; decomposition; defluorination; energy consumption; persistent organic pollutant; pH; priority journal; ultrasound; waste component removal; water management
Type
journal article