Sonochemical Oxidation of Arsenite in Aqueous Phase

概要

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The objective of this research is to assess critically the experimental rate data for sonochemical oxidation of arsenite [As(III)] at different frequencies and powers in the aqueous phase. The oxidative conversion of As(III) into arsenate [As(V)] was ${>}90$% in the range of 283 to 450 kHz. With a power density of 69 W L-1, the oxidation of As(III) for 40 min at 283 kHz showed a second-order rate constant of $7.1\times 10^{2}$ M-1 s-1, whereas it was $3.8\times 10^{3}$ M-1 s-1 at 450 kHz. As calculated by the calorimetric method, the power transferred into samples was in the range of 7--34.5 W with the two frequencies of 283 or 450 kHz. Approximately 100% oxidation efficiency was obtained with a frequency of 450 kHz and 34.5 W. As the pretreatment process, oxidation by sonication has potential applications to groundwater contaminated with both As(III) and As(V).
2011-07-25