| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
We investigated the effects of 200 kHz ultrasonication and short-wavelength UV (UV254+185) irradiation on the degradation of persistent perfluorochemicals, such as perfluorooctane (PFO) with hydrophobic property, and perfluorooctanoic acid (PFOA) and pentafluoropropionic acid (PFPrA) with hydrophilic property that were found as degradation intermediates of PFO. 200 kHz ultrasonic irradiation strongly affected on hydrophobic PFO, and UV254+185 irradiation was more effective for hydrophilic PFOA and PFPrA. On the other hand, volatile organic compound (VOC) gas was decomposed and mineralized effectively in gas phase on the mist surface generated by 2.4 MHz ultrasonication with advanced oxidation process. Furthermore, the optimal frequency that can cause the effects of both frequencies was chosen from the viewpoint of mist generation, and three aldehydes with different physical properties were effectively decomposed thermally inside the cavity and radical reactions on the mist surface.
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