Campbell, Tammy and Hoffmann, Michael R. (2015) Sonochemical degradation of perfluorinated surfactants: Power and multiple frequency effects. Separation and Purification Technology, 156 . pp. 1019-1027. ISSN 1383-5866. http://resolver.caltech.edu/CaltechAUTHORS:20160107-153732854
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Perfluorosulfonates and carboxylates, C_4 to C_8 surfactants, are sonolytically degraded primarily at the vapor–water interface of cavitation bubbles. The observed pseudo first-order rate constants for the elimination of the perfluorosurfactants indicate that rates should be proportional to the degree of interfacial bubble–water partitioning. In fact, the sonochemical degradation rates of the more soluble and less hydrophobic perfluorobutane sulfonate, PFBS, and perfluorobutanoate, PFBA, were found to be slower than longer chain analogs due to their greater water solubility compared to the C_8 counter parts. The observed degradation rate constants are found to increase with increasing power density. Enhanced degradation rates were observed for the C_8 surfactants, PFOS (∼12%) and PFOA (∼23%) under simultaneous irradiation at 20 kHz and 202 kHz at a power combined power density of 250 W L^(−1).
|Additional Information:||© 2015 Elsevier B.V.|
|Subject Keywords:||Ultrasound; Perfluoro-surfactants; Degradation; Frequency; Power density; Chain length; PFOA; PFOS|
|Official Citation:||Tammy Campbell, Michael R. Hoffmann, Sonochemical degradation of perfluorinated surfactants: Power and multiple frequency effects, Separation and Purification Technology, Volume 156, Part 3, 17 December 2015, Pages 1019-1027, ISSN 1383-5866, http://dx.doi.org/10.1016/j.seppur.2015.09.053. (http://www.sciencedirect.com/science/article/pii/S1383586615302288)|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||07 Jan 2016 23:42|
|Last Modified:||07 Jan 2016 23:42|
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