Creation of super high performance photocatalyst by control of nanomicrostructure of titanium oxide

通过控制氧化钛纳米微结构创造超高性能光催化剂

• 批准号: 18550183
• 负责人: HASEGAWA Akira
• 金额: $ 2.62万
• 依托单位: Hachinohe National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18550183/
• 关键词: Photocatalyst; TiO_2; square rod; oxygen defects; 5-coodinated Ti; 角柱状; 粒子形態; Photocatalyst; TiO_2; square rod; oxygen defects; 5-coodinated Ti; 角柱状; 粒子形態

Various TiO_2 were prepared by sol-gel process using titanium tetraisopropoxide (TTIP) and different dilos. We prepared successfully the highly ctystalline precursors, Ti (OCH (CH_3)CH_2CH_2O)_2 from 1, 3-butanediol and Ti (OCH_2CH_20)_2 from ethylene glycol. In particular, the titanium alkoxy-diolate from 1, 3-butanediol was drastically decomposed at 346℃ and transformed to TiO_2 phase with the square rod framework. The square rod TiO_2, whose typical size was estimated to be 1.5μm long and 0.3μm in width, was easily synthesized by the calcination of precursors at 500℃ in air. The framework of square rod TiO_2 was constructed from fine TiO_2 particles with 25 nm in diameter. EXAFS and XPS analyses revealed the presence of 5-coodinated. Ti species and oxygen defects.The photocatalytic activities as high as P25 was achieved during the photo-oxidation of acetaldehyde. The activity was due to the high distribution of oxygen defects of TiO_2 particles, which were components of the construction of the square rod framework. In addition, the oxygen defect acted effectively as a photo-oxidation site by the capture of hole generated by UV irradiation. It concluded that both oxygen defect and square rod shape were essential for the generation of the photo-oxidation activity

使用钛四氧化钛（TTIP）和不同的DILOS通过SOL-GEL工艺制备各种TIO_2。我们成功地从1、3-丁烷二醇和Ti（OCH_2CH_20）_2 _2 _2成功地准备了高度ctystalline的前体Ti（OCH（CH_3）CH_2CH_2O）_2。特别是，从1个丁烷二醇酸钛二聚酸钛二聚酸酯在346℃下大量分解，并使用方杆框架转化为TiO_2相。方杆TIO_2的典型尺寸估计为1.5μm，宽度为0.3μm，在空气中的500℃下很容易通过钙前体合成。平杆TIO_2的框架是由直径25 nm的细TiO_2颗粒构建的。 EXAF和XPS分析显示了5个辅助的存在。 Ti物种和氧缺陷。在乙醛的光氧化过程中，光催化活性高达p25。活性是由于TIO_2颗粒的氧缺陷的高分子，这些缺陷是平方杆框架构造的组成部分。此外，氧缺陷通过捕获紫外线照射产生的孔有效地充当光氧化位点。它得出的结论是，氧缺损和方杆形状对于光氧化活性的产生至关重要