Persulfate oxidation of perfluorooctanoic acid under the temperatures of 20-40°C
Journal
Chemical Engineering Journal
Journal Volume
198-199
Pages
27-32
Date Issued
2012
Author(s)
Abstract
Treatment of persistent and bioaccumulative perfluorooctanoic acid (PFOA) in water using persulfate (S2O82-) oxidation with heating or UV radiation has been found effective. However, applications of this process to remediate PFOA contamination require a relatively high temperature (70-90 °C) or energy-consuming irradiation to proceed. The objectives of this study were to investigate persulfate oxidation of PFOA under relatively low temperatures (20-40 °C), more commonly encountered in the natural environment and to evaluate the effects of pH (pH = 2.5, 3.6, 7.1 and 11.0) and persulfate doses (20-200. mM) on the reaction rate for this temperature range. PFOA compounds (241.5 μM) with 200. mM persulfate were almost completely decomposed under an initial pH of 2.5 after 72. h at 40 °C and after 215. h at 30 °C. Even under such a low temperature of 20 °C, the decomposition efficiency reached 80.5% after 648. h. Lower pH or higher persulfate doses resulted in a faster PFOA degradation. A series of kinetic experiments (20, 26, 30 and 40 °C) on PFOA degradation by persulfate oxidation were conducted, and a model was developed that successfully predicted the PFOA decay at various reaction times in this low temperature range (20-40 °C). © 2012 Elsevier B.V.
SDGs
Type
journal article