抄録
Orgarnc matter dissolved in water was decomposed by pyrolysis and reaction with OH radicals generated in the cavities formed by ultrasound. In general, hydmphobic olgarnc pollutanis are thought to be decomposed by sonolytic reactions more than hydrophilic organic pollutants. When the hydrophobic oigarnc pollutants are decomposed in water, their hydrophilic organic intennediates could remain longer. Therefore, we tried to enhance the sonolytic degradation of hydrophilic organic pollutants by combining ultrasound with TiO_2 photocatalytic reaction, and investigated the effects of the photocatalyst amount and frequencies by ultrasound on their decomposition ratios. Benzaldehyde and formaldehyde were selected as model pollutants due to their hydrophobicity and hydrophiiicity, respectively. Remarkable enhancement of decomposition ratios of hydrophilic organic pollutants and interaction between ultrasound and photocatalytic reaction was observed independently of the frequency. Moreover, an effective decomposition was obtained with lower photocatalyst amounts than when using only in photocatalytic reactions.
