Preparation, Characterization, and Reactivities of Highly Functional Titanium Oxide-Based Photocatalysts Able to Operate under UV—Visible Light Irradiation: Approaches in Realizing High Efficiency in the Use of Visible Light
Preparation, Characterization, and Reactivities of Highly Functional Titanium Oxide-Based Photocatalysts Able to Operate under UV—Visible Light Irradiation: Approaches in Realizing High Efficiency in the Use of Visible Light
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DOI：
10.1002/chin.200448238
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发表时间：
2004-08
期刊：
影响因子：
--
通讯作者：
M. Anpo
中科院分区：
文献类型：
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作者：
M. Anpo
本文综述了高活性、高功能的二氧化钛光催化剂的设计和开发的研究进展，这些光催化剂不仅可以利用紫外光，还可以利用可见光或太阳光，并在分子水平上澄清活性中心和检测反应中间产物。考虑到其广泛的应用和无污染的性质，通过对这种TiO2光催化剂的电子性质进行改性，可以有效地利用太阳能并将其转化为有用的、安全的化学能，这是非常有潜力的。离子注入等改性方法不仅适用于半导体块状TiO2光催化剂，也适用于高分散在沸石骨架中的TiO2光催化剂和薄膜光催化剂。此外，负载少量的铂可以显著提高半导体二氧化钛纳米粉末的光催化活性。这加强了还原反应，导致光照射产生的电子和空穴的电荷分离。此外，在沸石骨架和SiO_2或Al_2O_3基质中制备的高度分散的二氧化钛具有比半导体块体TiO2光催化剂更高的独特的光催化性能。值得注意的是，应用射频磁控溅射沉积方法，成功地在不同衬底上直接制备了这种可见光响应型二氧化钛薄膜光催化剂。
A review of the research advances made in the design and development of highly reactive and functional titanium oxide photocatalysts, which can utilize not only UV but also visible or solar light, and a clarification of the active sites as well as the detection of the reaction intermediates at the molecular level have been presented here. The potential for the effective utilization and conversion of solar energy into useful and safe chemical energy by the modification of the electronic properties of such TiO 2 photocatalysts is great when one considers their myriad applications as well as their nonpolluting qualities. Such a modification process by methods such as ion-implantation can be applied not only for semiconducting bulk TiO 2 photocatalysts but also for TiO 2 thin film photocatalysts and titanium oxide photocatalysts highly dispersed within zeolite frameworks. Moreover, the photocatalytic reactivity of semiconducting TiO 2 nano-powders was found to be dramatically enhanced by the loading of small amounts of Pt. This worked to enhance the reduction reaction, resulting in the charge separation of the electrons and holes generated by light irradiation. In addition, highly dispersed titanium oxide species prepared within zeolite frameworks as well as SiO 2 or Al 2 O 3 matrices showed much higher and unique photocatalytic performances as compared to semiconducting bulk TiO 2 photocatalysts. Significantly, a new alternative method to directly prepare such visible light-responsive TiO 2 thin film photocatalysts on various substrates has been successfully developed by applying a RF magnetron sputtering deposition method.