Abstract
Ultrasonic degradation of 2,4-dichlorophenol (2,4-DCP) has been studied under oxygen, air, argon, and nitrogen in aqueous solutions for a liquid temperature of 20 ° C at 489 kHz. The degradation rate increases significantly in the presence of O 2, and argon, whereas it remains the lowest under nitrogen, for which a competitive reaction model has been proposed for its non-exponential decay. Experiments have been also performed at three different pHs, 11.0, 6.3, and 2.0. The significant degradation has been achieved at pH 6.3 under O 2( 0.86 × 1 0 − 3 s −1), which is 1.9 and 4 times higher than acidic (pH 2.0), and basic (pH 11.0) conditions, respectively. The degradation rates have decreased in the order O 2 > Ar > air > N 2 irrespective of pH.
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