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By using O 3  fine bubbles that promote the mass transfer of O 3  to the liquid phase and the conversion of the dissolved O 3  into active oxygen species with a high oxidation potential, an improved liquid-phase oxidation technique was developed to accelerate the degradation of an organic compound at a constant O 3  flow rate. By the use of a dielectric-barrier-discharge reactor, O 2  was converted into O 3  at an O 2  flow rate of 0.56 mmol/(L·min), with 5 mol% O 2 -to-O 3  conversion. Using a self-supporting bubble generator, O 3  bubbles with an average diameter ( dbbl ) of 50 µm were continuously supplied into a solution in TBA (OH• scavenger) at 303 K, and the TBA being degraded. For comparison, O 3  bubbles with  dbbl  values of 200–5000 µm were obtained using a dispersing-type generator. It was found that the minimization of bubble diameter accelerated both O 3  dissolution, as a consequence of the increase in the gas–liquid interfacial area and the residence time of the bubbles, and enhanced OH• generation, because of the increase in contact probability between dissolved O 3  and OH –  at the minute gas–liquid interfaces, caused by the accumulation of OH –  around the fine bubble surfaces. To ascertain the influence on organic compound degradation of the improved oxidation potential, bisphenol A, as a model compound, was degraded by O 3  bubble injection at different  dbbl  values. Sequentially, the high OH• selectivity obtained by minimizing the bubble diameter can effectively achieve the rapid degradation of organic compounds and intermediates under a constant O 3  flow rate.

Enhanced generation of active oxygen species induced by O 3 fine bubble formation and its application to organic compound degradation