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The Design and Development of Novel Titanium Oxide Photocatalysts Prepared on the Various Plate Materials by an Advanced Ion Engineering Techniques

采用先进离子工程技术在各种板材上制备新型氧化钛光催化剂的设计与开发

基本信息

批准号：
10650816
负责人：
ANPO Masakazu
金额：
$ 2.05万
依托单位：
Osaka Prefecture University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

The photocatalytic degradation of various toxic compounds in aqueous solution using fine TiOィイD22ィエD2 particles has been investigated by many researchers, however, to avoid the filtration and suspension of the small particle photocatalysts, the design of an effective transparent TiOィイD22ィエD2 thin film photocatalyst is strongly desired. In this research project, transparent TiOィイD22ィエD2 thin film photocatalysts were prepared on transparent porous Vycor glass (PVG) by the ionized cluster beam (ICB) method. UV-Vis and XAFS investigations revealed the formation of uniform thin anatase TiOィイD22ィエD2 films with good crystallinity, even in the case of a film thickness of less than 300 nm. These thin TiOィイD22ィエD2 films were found to efficiently decompose NO into NィイD22ィエD2 and OィイD22ィエD2 photocatalytically under UV light irradiation. A modification of these TiOィイD22ィエD2 thin films were successfully carried out by applying an advanced metal ion-implantation technique with various transition meta … More l ions such as V and Cr. The UV-Vis absorption spectra of these metal ion-implanted TiOィイD22ィエD2 thin films were found to shift smoothly toward visible light regions and exhibited the ability to decompose NOx under irradiation with visible light longer than 450nm, while at the same time, maintaining a high photocatalytic activity under UV light irradiation. Furthermore, it was found that by using a magnetron sputtering method, the preparation of unique TiOィイD22ィエD2 thin films which decompose NO efficiently under visible light irradiation, without applying the ion-implantation of transition metal ions was possible. In-situ XPS measurements revealed that the Ti/O ratio of the TiOィイD22ィエD2 thin films gradually decrease from the surface to bulk phase of the catalyst, which plays an important role in the remarkable shift of the absorption band of the films toward visible light regions. Thus, it was shown that these unique TiOィイD22ィエD2 films newly prepared by such advanced ion-engineering techniques enable the utilization of as much as 35% of the solar beams that reach the earth, showing a remarkable contrast to the activity of commonly used TiOィイD22ィエD2 thin films which can utilize only about 4%. Less

许多研究人员已经研究了用细小的tio2 - D22 μ l - D2光催化降解水溶液中各种有毒化合物的方法，然而，为了避免小颗粒光催化剂的过滤和悬浮，迫切需要设计一种有效的透明tio2 - D22 μ l - D2薄膜光催化剂。本课题在透明多孔Vycor玻璃（PVG）上，采用离子化簇束（ICB）法制备了tio_ (γ) _ (γ) _ (22) _ (γ) _ （D2）薄膜光催化剂。UV-Vis和XAFS研究表明，即使在薄膜厚度小于300 nm的情况下，也能形成均匀且结晶度良好的锐钛矿薄膜。研究发现，在紫外光照射下，这些薄膜能有效地将NO光催化分解为N硝酰D22硝酰D22硝酰D2和O硝酰D22硝酰D2。修改这些TiOィイD22摊位ィエD2薄膜成功进行了通过应用先进的金属离子注入技术与各种过渡元 ... l离子V和Cr等。这些金属离子注入的紫外可见吸收光谱TiOィイD22摊位ィエD2薄膜被发现顺利转向可见光区域和表现出的能力分解氮氧化物与可见光辐照下超过450海里,同时,在紫外光照射下保持较高的光催化活性。此外，还发现采用磁控溅射方法可以制备出在可见光照射下有效分解NO的独特的tio_ (γ) _ (γ) _ (22) _ (γ) _ （D2）薄膜，而无需施加过渡金属离子的离子注入。原位XPS测量结果表明，从催化剂表面到体相，tio_2薄膜的Ti/O比逐渐降低，这是薄膜吸收带向可见光区显著移动的重要原因。结果表明，采用这种先进的离子工程技术制备的独特的tio_2，可使到达地球的太阳光线的利用率达到35%，与常用的tio_2薄膜的活性仅为4%形成鲜明对比。少