P15 ラジカル反応による水処理に関する研究 : 超音波処理における石炭灰の影響について
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Introduction It has been reported that hydrophilic compounds were decomposed by OHgenerated from ultrasound cavitation or with catalyst as TiO_2 etc. Coal ash from a thermal power station is composed of inorganic oxides such as SiO_2, Al_2O_3, Fe_2O_3, TiO_2 etc. The ash is mainly used as cement or concrete materials, however not sufficiently used its advanced characteristic. We report the results of the study for catalysis of the coal ash on radical reaction for water treatment with ultrasound. Experimental Methods As shown in Fig.1, the experimental apparatus for the ultrasonic irradiation consisted of an ultrasonic generator, a barium titanate oscillator operation at 200 kHz, and a water bath for the maintenance of the constant temperature of 20℃. The glass vessel was fixed at a constant position (λ/2=3.8 mm from the oscillator) relative to the nodal plane of the sound wave. Phenol solution (100 mL) was prepared at 10 ppm (106 μM) in the vessel, and irradiated with ultrasound. Phenol was analyzed by JIS (Japanese Industrial Standards) 0102 28.1 (spectrophotometric analysis with 4-aminoantipyrine). Coal ash was a fly ash gotten from the thermal power station burns an Australian coal. Results and Discussion The initial degradation rate of phenol by sonication was 1.87 μM/min, and in the presence of coal ash (0.5 wt%) was 3.92 μM/min. In the case of only coal ash without sonication, phenol was not degraded (Fig.2). In the sonic treatment, the initial degradation rate of phenol increased with increasing the amount of coal ash (Fig.3). Iron was eluted from coal ash by sonication. It has been reported that organic compounds were decomposed by radical from the Fenton reaction in the presence of Fe^<2+> and H_2O_2. Degradation of phenol is assumed to be promoted by increase of radical which was formed in the presence of eluted Fe^<2+> and generated H_2O_2 by sonication.
- 日本ソノケミストリー学会の論文
- 2005-10-14
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