A06 超音波と短波長紫外光を併用した水中アルデヒド類の二相分解

抄録

In this study, 430 kHz of ultrasonication which can cause pyrolysis by chemical effect and atomization by physical effect simultaneously was selected and applied to highly effective decomposition of organic pollutants in water. In order to investigate the influence of physical properties on the degradation rate, three different aldehydes, formaldehyde, acetaldehyde and benzaldehyde, were chosen as model substances. As a result, removal ratio of formaldehyde, acetaldehyde and benzaldehyde reached 21.1%, 53.0% and 100% after 120 min by only US irradiation, respectively. It means that the decomposition of hydrophobic organic compounds proceeds rapidly in liquid phase by pyrolysis inside the cavity. Also, in the case of combining the UV irradiation and the ultrasonic atomization, formaldehyde and acetaldehyde with hydrophilic property were effectively decomposed on the mist surface in gas phase, however, benzaldehyde with hydrophobicity was hardly decomposed in the same condition. From these results, it was confirmed that UV irradiation acts on decomposition of hydrophilic organic compounds which exist inside or surface of the mist effectively.