Magnetic field effects on the amount of active oxygen species released from semiconductor photocatalysts on light irradiation

磁场对半导体光催化剂在光照射下释放的活性氧数量的影响

• 批准号: 18550011
• 负责人: NAKAGAKI Ryoichi
• 金额: $ 2.45万
• 依托单位: Kanazawa University
• 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-18550011/
• 关键词: Photofunctional material; Active oxygen species; Surface reactions; Magnetic field effects; Radical reactions; Chemiluminescence; Photocatalysts; 酸化チタン

Superoxide anion radical (O_(2-)) and OH radical generations in suspensions of Ag metal^(-), Ag_(2)O^(-), or AgO-loaded TiO_(2) and BiVO_(4)photocatalysts in alkaline condition (at pH=12.0) were examined by means of luminal chemiluminescence(CL) and spin-trapping fluorescence technique where terephthalic acid reacts with an OH radical to afford the highly fluorescence 2-hydmxyterephthalic acie (TAOH). The observed luminal CL intensity was remarkably enhanced by the AgO loading on TiO_(2) and BiVO_(4), This can be explained in terms of augmentation of 0_(2-) production on the AgO-loaded photocatalysts due to synergetic effects on the thermocatlytic activity on the AgO surface and efficient electron-hole separation at the photocatalyst/Ag0 interface. On the other hand, the loading effects of AgO on the TAOH formation rates for the 1102 samples were much larger than those for the BiVO_(4) catalysts by ca. three orders of magnitude. The properties of 0_(2)-and OH radical generations on these photocatalysts are discussed on the basis of the luminal CL kinetids and approximate band edge positions of 710_(2), BiVO_(4), and silver oxides. No significant magnetic field effects were observed on the amount of active oxygen species released from semiconductor photocatalysts on light irradiation.

Ag金属^(-)、Ag_(2)O^(-)或负载AgO的TiO_(2)和BiVO_(4)光催化剂在碱性溶液中的悬浮液中超氧阴离子自由基(O_(2-))和OH自由基的生成通过发光化学发光 (CL) 和自旋捕获荧光技术检查条件（pH=12.0），其中对苯二甲酸与 OH 自由基反应，提供高度荧光 2-羟基对苯二甲酸 (TAOH)。 TiO_(2) 和 BiVO_(4) 上的 AgO 负载显着增强了观察到的发光 CL 强度，这可以用 AgO 负载光催化剂上 0_(2-) 产量的增加来解释，这是由于对光催化剂的协同效应所致。 AgO 表面的热催化活性和光催化剂/AgO 界面上的有效电子空穴分离。另一方面，AgO 对 1102 个样品的 TAOH 形成速率的负载影响比 BiVO_(4) 催化剂的负载影响大约 100%。三个数量级。基于710_(2)、BiVO_(4)和氧化银的管腔CL动力学和近似能带边缘位置，讨论了这些光催化剂上0_(2)-和OH自由基生成的性质。在光照射下，没有观察到磁场对半导体光催化剂释放的活性氧物质的量产生显着的影响。

项目成果

物理系薬学IV演習編

物理药剂 IV 练习

• 发表时间: 2008
• 作者: 日本薬学会(分担執筆)

Degradation of benzo[a]pyrene using TiO_2 and Ag-loaded BiVO_4 photo-Catalysts: Evaluation by the Ames mutagenicity assay

TiO_2 和载银 BiVO_4 光催化剂降解苯并[a]芘：Ames 致突变性测定评估

• 发表时间: 2007
• 作者: S. Kohtani; Y. Inaoka; K. Hayakawa; R. Nakagaki
• 通讯作者: R. Nakagaki

Technol., Deradation of benzo[a]pyrene using TiO_ and Ag-loaded BiVO_

技术，使用 TiO_<2> 和负载 Ag 的 BiVO_<4> 去除苯并[a]芘

• 发表时间: 2007
• 作者: S. Kohtani; Y. Inaoka; K. Hayakawa; R. Nakagaki J. Ad. Oxid
• 通讯作者: R. Nakagaki J. Ad. Oxid

Magnetic field and methylene chain length effect on photochemistry of Bichromophoric chain species containing 7-nitro-2-fluorenyloxy and Anilino chromophores

磁场和亚甲基链长度对含有 7-硝基-2-芴氧基和苯胺基发色团的双发色链物种光化学的影响

• 发表时间: 2007
• 作者: K. Takahashi; S. Kohtani; R. Nakagaki
• 通讯作者: R. Nakagaki

Synthesis, absorption, and Fluorescence properties and crystal structures of 7-amino-Coumarin derivatives, J. Photochem. Photobiol

7-氨基-香豆素衍生物的合成、吸收、荧光特性和晶体结构，J. Photochem。

• 发表时间: 2007
• 作者: N. Kitamura; T. Fukagawa; S. Kohtani; S. Kitoh; K. Kunimoto; R. Nakagaki
• 通讯作者: R. Nakagaki