Synthesis of Visible Light Active Photocatalyst Controlling the Nanostructure of Layered Titanate

控制层状钛酸盐纳米结构的可见光活性光催化剂的合成

• 批准号: 12450349
• 负责人: SATO Tsugio
• 金额: $ 9.22万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450349/
• 关键词: H_2Ti_4O_9; HTaWO6; TiO_2; CbS; Nanocomposite; Intercalation; Photocatalytic activity; Visible light reactivity; 白金; 光化学特性; チタニア; 光触媒; 可視光; 遷移金属付活; ルチル; 酸化鉄; 水熱晶析反応; イオン交換反応

Layered titanate, H_2Ti_4O_9 incorporating CdS, Fe_2O_3 and TiO_2, H_2Ti_4O_9 simultaneously alloyed with Cu^<2+> and Nb^<5+> or Ta^<5+>, and layered HTaWO_6 incorporating TiO_2 and Pt were prepared and their photocatarytic activities under visible light irradiation were investigated. All samples possessed photocatalytic activity for the hydrogen evolution from sodium sulfide or methano aqeous solution under visible light irradiation (λ 0x(3E) 400 nm). HTaWO_6 was unstable in methanol aqueous solution under UV light irradiation, but HTaWO_6/(TiO_2,Pt) nanocomposite was stable and showed visible light active photocatalytic activity for evolving hydrogen gas from methanol aqueous solutionn. The excellent photocatalitic activity of semiconductor particles incorporated was attributed to the charge separation by guest to host electron transfer. By analyzing the fluorescence life times of CdS and TiO_2 incorporated in H_2Ti_4O_9 and H_4Nb_6O_<17>, it was confirmed that photoinduced electron in CdS and/or TiO_2 in the interlayer quickly transfer to the host layers. The electron transfer rate constant from CdS to H_2Ti_4O_9 and/or H_4Nb_6O_<17> were determined as ca. 10^6 sec^<-1> and those from TiO_2 to H_2Ti_4O_9 and H_4Nb_6O_<17> were 10^8 sec^<-1>.

分层的钛酸盐，H_2TI_4O_9掺入CD，Fe_2O_3和TIO_2，H_2TI_4O_9，简单地与Cu^<2+>和Nb^<5+>或nb^<5+>或Ta^<5+>合金合金，并在调查了Photocatary Actifir Inradirifectiquiatient and pectibiation中，htawo_6 comporiation wapibil wapiber way rifractifectirefiration。所有样品在可见光照射下（λ0x（3E）400 nm）均具有从硫化钠或甲烷酸钠溶液中进化的光催化活性。 HTAWO_6在甲醇水溶液中在紫外光照射下是不稳定的，但是HTAWO_6/（TIO_2，PT）纳米复合材料是稳定的，显示可见的光活性光催化活性，可从甲醇水溶液中演化氢气。掺入的半导体颗粒的出色光催化活性归因于客人的电荷分离以宿主电子传递。通过分析H_2TI_4O_9和H_4NB_6O__ <17>中CDS和TIO_2的荧光寿命时间，可以证实，可以证实，在CDS中摄影诱导的电子和/或TIO_2在Interlayer中迅速转移到宿主层中。电子传输速率从CD到H_2TI_4O_9和/或H_4NB_6O__ <17>确定为CA。 10^6 sec^<-1>以及从tio_2到h_2ti_4o_9和h_4nb_6o__ <17>的那些是10^8 sec^<-1>。