A4 光触媒と超音波を併用した有機物の分解 : 中間生成物の分解速度からみた併用効果

概要

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Various purification techniques are researched for water effluent treatment and environmental water clean-up. As one of those techniques, ultrasound (US) and the combined technique of ultraviolet irradiation (UV, main wavelength: 365 nm) with TiO_2 photocatalysis (UV/TiO_2) has been researched. It has been reported that the combined use of US with UV/TiO_2 (US/UV/TiO_2) synergistically improved the VOC degradation efficiency in water treatment. However, this synergistic effect has a large extent of unexplained features. Especially, reports about the influence of the characteristics of the organic matter are very few. Therefore, in order to clear this influence, degradation experiments using model substances with different characteristics such as benzaldehyde (C_6H_5CHO) and formaldehyde (HCHO), were carried out, considering about the behavior of decomposition products generated from the model substances. As a result, low degradation ratio was confirmed when using US for highly hydrophilic organic matter and low concentration organic matter, and also it was confirmed when using UV/TiO_2 for high concentration organic matter. However, because of the synergistic effect between ultrasound and the photocatalytic reactions, these disadvantages were improved and high concentration organic matter was completely decomposed.
日本ソノケミストリー学会の論文
2005-10-14