Abstract
The red coloring in water colored by an organic dye, rhodamine B, was removed in as fast as 10 s by pulsed gas discharge. Water was atomized by air and flowed as a mist down the central part of a reactor and as a water film down the inner wall. Radicals, such as ozone, OH and O, which were produced by radial barrier discharge, decolorized rhodamine B. Color was completely removed at a low water flow rate and high total input energy, but the removal efficiency was highest at a high water flow rate and low total input energy. By using oxygen, the color removal and removal efficiency were improved due to higher ozone concentration produced than in the case of using air. The efficiency was improved in proportion to the initial concentration of rhodamine B. The highest removal efficiency of 8.2 µg/J was obtained at 22 mg/L and a water flow rate of 150 mL/min. The results of the discharge performed in Ar suggest that the radicals produced from water considerably contributed to the decolorization. By changing the reactor radius, we clarified that the water flowing down the reactor wall as a water film was decolorized as well as the atomized water in the reactor.
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