Kamegawa Takashi, Ishiguro Yasushi, Kido Ryota, Yamashita Hiromi
Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Molecules. 2014 Oct 13;19(10):16477-88. doi: 10.3390/molecules191016477.
Hydrophobic Y-zeolite (SiO2/Al2O3 = 810) and TiO2 composite photocatalysts were designed by using two different types of TiO2 precursors, i.e., titanium ammonium oxalate and ammonium hexafluorotitanate. The porous structure, surface property and state of TiO2 were investigated by various characterization techniques. By using an ammonium hexafluorotitanate as a precursor, hydrophobic modification of the Y-zeolite surface and realizing visible light sensitivity was successfully achieved at the same time after calcination at 773 K in the air. The prepared sample still maintained the porous structure of Y-zeolite and a large surface area. Highly crystalline anatase TiO2 was also formed on the Y-zeolite surface by the role of fluorine in the precursor. The usages of ammonium hexafluorotitanate were effective for the improvement of the photocatalytic performance of the composite in the degradation of 2-propanol in the gas phase under UV and visible light (λ > 420 nm) irradiation.
采用两种不同类型的TiO₂前驱体，即草酸钛铵和六氟钛酸铵，设计了疏水Y型沸石（SiO₂/Al₂O₃ = 810）和TiO₂复合光催化剂。通过各种表征技术研究了TiO₂的多孔结构、表面性质和状态。以六氟钛酸铵为前驱体，在空气中773K煅烧后，成功地同时实现了Y型沸石表面的疏水改性和可见光敏感性。制备的样品仍保持Y型沸石的多孔结构和大表面积。前驱体中的氟作用还使Y型沸石表面形成了高结晶度的锐钛矿TiO₂。六氟钛酸铵的使用对提高该复合材料在紫外光和可见光（λ>420nm）照射下降解气相异丙醇的光催化性能有效。
