Generation of reactive mist using ultrasonic atomization and UV irradiation and its application to an air purification technique

采用超声波和短波紫外辐照产生反应雾，并将其用于挥发性有机化合物（VOC）气体的降解。一般来说，已经报道的超声雾具有微尺度的直径。然而，本研究主要确定的是亚微米尺度的雾。采用含TiO_2光催化剂和UV照射的超声波雾剂，无论其疏水性如何，均能有效地分解雾剂表面的OH自由基，从而获得了较高的VOC去除率。挥发性有机化合物气体降解形成的分解产物被捕获到雾中，在反应器出口未被检测到。另一方面，我们认为即使不使用TiO_2，过氧化氢在紫外照射下也会在雾表面形成OH自由基。然而，它们的数量很少，VOC气体的去除率取决于OH自由基的形成率。

Reactive mist was generated using ultrasonication and short-wavelength UV irradiation, and it applied to degradation of volatile organic compound (VOC) gases. In general, it has been reported that ultrasonic mist has a micro-scale diameter. However, a submicron-scale mist was mainly confirmed in this study. High removal ratios of VOC gases were obtained using ultrasonic mist including TiO_2 photocatalyst and UV irradiation because their gases were effectively decomposed by OH radicals on the mist surface regardless of their hydrophobic properties. The decomposition products formed by degradation of VOC gases were captured into the mist and were not detected at the outlet of the reactor. On the other hand, it was thought that OH radicals were formed on the mist surface from hydrogen peroxide with UV irradiation even though TiO_2 was not used. However, their amount was a little, and the removal ratio of VOC gases depended on the formation ratio of OH radicals.