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

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

采用四异丙醇钛(TTIP)和不同的二元醇通过溶胶-凝胶法制备了各种TiO_2，我们成功地从1, 3-丁二醇制备了高结晶前驱体Ti(OCH(CH_3)CH_2CH_2O)_2和从乙烯制备Ti(OCH_2CH_20)_2。特别地，来自1的烷氧基二醇钛。 3-丁二醇在346℃下急剧分解并转化为具有方棒骨架的TiO_2相，其典型尺寸估计为长1.5μm、宽0.3μm，通过前驱体在30℃下煅烧很容易合成。 500℃空气中，由直径25 nm的细TiO_2颗粒构成方棒TiO_2的骨架，并通过EXAFS和XPS分析。揭示了5-配位的Ti物种和氧缺陷的存在。在乙醛的光氧化过程中实现了高达P25的光催化活性，该活性是由于TiO_2颗粒的氧缺陷的高分布所致。此外，通过捕获紫外线照射产生的空穴，氧缺陷可以有效地充当光氧化位点。由此得出结论，氧缺陷和方形棒形状都是必不可少的。用于产生光氧化活性