12. Seymour, James D.; Gupta, Ram B.. Oxidation of
Aqueous Pollutants Using Ultrasound: Salt Induced Enhancement.
Abstract
Ultrasound can be used to oxidize aq. pollutants; however, due to economic reasons, higher oxidn./destruction rates are needed. Enhanced reaction rates by addn. of NaOH salt are reported. Using 20 kHz ultrasound, large, salt-induced enhancements were obsd.: 6-fold for chlorobenzene, 7-fold for p-ethylphenol, and 3-fold for phenol oxidn. Reaction rate enhancements are proportional to the di-Et ether-water partitioning coeff. of the pollutants. It appears the majority of oxidn. reactions occur in the bubble-bulk interface region. Salt addn. increases the aq. phase ionic strength which drives org. pollutants toward the bubble-bulk interface. A first order reaction rate equation is proposed which can represent the obsd. enhancement with good accuracy. A new sonochem.-waste-oxidn. process is proposed using this salt-induced enhancement.
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