Yasumori Atsuo, Yanagida Sayaka, Sawada Jun
Department of Materials Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan.
Photocatalysis International Research Center, Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan.
Molecules. 2015 Jan 30;20(2):2349-63. doi: 10.3390/molecules20022349.
Combinations of TiO2 photocatalysts and various adsorbents have been widely studied for the adsorption and photocatalytic decomposition of gaseous pollutants such as volatile organic compounds (VOCs). Herein, a TiO2-zeolite-porous glass composite was prepared using melt-quenching and partial sintering, hydrothermal treatment, and drop coating for preparation of the porous glass support and X-zeolite and their combination with TiO2, respectively. The obtained composite comprised anatase phase TiO2, X-zeolite, and the porous glass support, which were combined at the micro to nanometer scales. The composite had a relatively high specific surface area of approximately 25 m2/g and exhibited a good adsorption capacity for 2-propanol. These data indicated that utilization of this particular phase-separated glass as the support was appropriate for the formation of the bulk photocatalyst-adsorbent composite. Importantly, the photocatalytic decomposition of adsorbed 2-propanol proceeded under UV light irradiation. The 2-propanol was oxidized to acetone and then trapped by the X-zeolite rather than being released to the atmosphere. Consequently, it was demonstrated that the micrometer-scaled combination of TiO2 and zeolite in the bulk form is very useful for achieving both the removal of gaseous organic pollutants and decreasing the emission of harmful intermediates.
二氧化钛光催化剂与各种吸附剂的组合已被广泛研究用于吸附和光催化分解气态污染物，如挥发性有机化合物（VOCs）。在此，采用熔融淬火和部分烧结、水热处理以及滴涂法分别制备了多孔玻璃载体、X型沸石及其与二氧化钛的组合，从而制备出二氧化钛-沸石-多孔玻璃复合材料。所得复合材料包含锐钛矿相二氧化钛、X型沸石和多孔玻璃载体，它们在微米到纳米尺度上结合在一起。该复合材料具有约25 m²/g的相对较高比表面积，对异丙醇表现出良好的吸附能力。这些数据表明，利用这种特殊的相分离玻璃作为载体适合形成块状光催化剂-吸附剂复合材料。重要的是，吸附的异丙醇在紫外光照射下进行光催化分解。异丙醇被氧化成丙酮，然后被X型沸石捕获，而不是释放到大气中。因此，证明了块状形式的二氧化钛和沸石在微米尺度上的组合对于实现气态有机污染物的去除和减少有害中间体的排放非常有用。
