Self-assembly of titanias having surface organic moieties and development of visible-light responsible photocatalytic materials

具有表面有机部分的二氧化钛的自组装和可见光光催化材料的开发

• 批准号: 16510085
• 负责人: IWAMOTO Shinji
• 金额: $ 2.5万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16510085/
• 关键词: Titania; Nanocrystal; Photocatalyst; Visible-light responsibility; 自己集積化; 熱安定性; 多孔性材料; 可視光応答

Thermal reaction of titanium tetraisopropoxide and tetraethyl orthosilicate in 1,4-butanediol (glycothermal method) afforded nanocrystalline silica-modified titanias having large surface area and superior thermal stability. In this study, the thus-obtained silica-modified titanias were treated in an NH_3 flow at high temperatures, and their physical and photocatalytic properties were investigated. Compared with NH_3-treated TiO_2 without silica modification, the NH_3-treated silica-modified titanias showed a stronger absorption in the visible region (400-500 nm) and had a larger peak at 396 eV in the N 1s XPS spectrum. These results indicate that a larger amount of nitrogen was stably doped in the silica-modified titania. The obtained products exhibited a high photocatalytic activity for degradation of Rhodamine B and decomposition of acetaldehyde under visible light irradiation. Nanocrystalline titanias modified with various elements (B, Mg, Al, P, Zn, and Ga) were also prepared by the glycothermal method and the obtained samples were nitrified in the same way. Among the six modifiers examined, addition of P was the most effective for photocatalytic decomposition of acetaldehyde under visible-light irradiation. After nitrification and annealing, the P-modified titania showed a strong absorption in the visible region (400-550 nm). It was found that the photocatalytic activity was related to the amount of nitrogen atoms doped in the anatase structure.

四异丙醇钛和正硅酸乙酯在1，4-丁二醇中的热反应（糖热法）得到了具有大比表面积和上级热稳定性的纳米晶二氧化硅改性二氧化钛。在本研究中，将所得的二氧化硅改性的二氧化钛在NH_3气流中高温处理，并研究其物理和光催化性能。与未改性的NH_3处理的TiO_2相比，NH_3处理的SiO_2改性的TiO_2在可见光区（400-500 nm）有较强的吸收，在N1s XPS谱中，在396 eV处有较大的吸收峰。这些结果表明，在二氧化硅改性的二氧化钛中稳定地掺杂了更大量的氮。在可见光照射下，所得产物对罗丹明B和乙醛的降解均表现出较高的光催化活性。还通过糖热法制备了各种元素（B、Mg、Al、P、Zn和Ga）改性的纳米TiO 2，并以相同的方式对所得样品进行了氮化。在所考察的六种改性剂中，添加P对可见光照射下乙醛的光催化分解最有效。在氮化和退火之后，P-改性的二氧化钛在可见光区（400-550 nm）显示出强吸收。结果表明，光催化活性与掺杂氮原子的量有关。

项目成果

XANES and XPS study of silica-modified titanias prpared by the glycothermal method

糖热法制备二氧化硅改性二氧化钛的 XANES 和 XPS 研究

• 发表时间: 2005
• 期刊: Chemisry of Materials 17
• 作者: Sh.Iwamoto;Se.Iwamoto;M.Inoue;H.Yoshida;T.Tanaka;K.Kagawa
• 通讯作者: K.Kagawa

Effect of the addition of a small amount of vanadium on the photocatalytic activities of N- and Si- co-doped titanias under visible-light irradiation

• DOI: 10.1007/s10562-007-9029-5
• 发表时间: 2007-02
• 期刊: Catalysis Letters
• 影响因子: 2.8
• 作者: H. Ozaki;S. Iwamoto;M. Inoue

Enhanced Visible Light Sensitivity of Nitrogen-doped Nanocrystalline Si-modified Titania Prepared by the Glycothermal Method

• DOI: 10.1246/cl.2005.1082
• 发表时间: 2005-07
• 期刊: Chemistry Letters
• 影响因子: 1.6
• 作者: H. Ozaki;S. Iwamoto;M. Inoue

XANES and XPS study of silica-modified titanias prepared by the glycothermal method

• DOI: 10.1021/cm040045p
• 发表时间: 2005-01
• 期刊: Chemistry of Materials
• 影响因子: 8.6
• 作者: S. Iwamoto;and Seiu Iwamoto;M. Inoue;H. Yoshida;Tsunehiro Tanaka;K. Kagawa

Visible-light-sensitive photocatalyst based on titania

基于二氧化钛的可见光敏感光催化剂

• 发表时间: 2005