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Fundamentals of TiOィイD22ィエD2 photocatalysis for environmental purification

TiO2D22 光催化环境净化基础知识

基本信息

批准号：
09555268
负责人：
FUJISHIMA Akira
金额：
$ 8.96万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

The photocatalytic degradation of pollutants in solution as well as in gas phase is attracting attention in terms of applications to environmental problem. Various applications of photocatalytic reactions in environmental purification have been demonstrated. Among the photocatalysts used, TiOィイD22ィエD2 is probed to be efficient material due to its strong oxidizing power and its compatibility for indoor and outdoor applications. We have focused our attention on development of transparent thin TiOィイD22ィエD2 films on various building materials, and to make use of weak UV light to enable the practical applications.We have been working for the development of photoactive TiOィイD22ィエD2 thin films, paints, paper and so on for self-cleaning and deodorant applications Then, highly transparent TiOィイD22ィエD2 thin films were developed to widen its applications in the manufacturing of cover glass used for lamps in high-way tunnels which are continuously exposed to oily, hydrocarbon containing vapors. We … More have also found that various bacteria as E coli are being killed oh the surface of TiOィイD22ィエD2 coated tiles under irradiation of weak UV light. We continue some field tests in order to confirm the long-term stability of the photo-functional intelligent TiOィイD22ィエD2 materials.In order to study the mechanistic and kinetic aspects ot TiOィイD22ィエD2 photocatalysis, we have recently developed a method in which the reaction products can be monitored separately at oxidation and reduction sites using a novel scanning microelectrode system located adjacent to each type of surface. In the latest Work, we have used a partically Pd-covered TiOィイD22ィエD2 as a model for metal-deposited photocatalyst to observe the concentration changes of dissolved oxygen, in the absence and presence of at oxidation and reduction sites.Active oxygen specie formed on TiOィイD22ィエD2 film photocatalysts in air were examined by use of a chemiluminescence method. We were able. to evaluate the time dependent behavior of active oxygen species and to distinguish a short-lived reactive species and a long-1ived species, the latter probably being OィイD22ィエD2. Less

光催化降解溶液和气相污染物在解决环境问题方面引起了人们的关注。光催化反应在环境净化中的各种应用已经得到证实。在所使用的光催化剂中，TiOiiD22ィD2由于其强氧化能力以及适合室内和室外应用的兼容性而被认为是一种高效材料。我们专注于开发各种建筑材料上的透明TiOiiD22ィエD2薄膜，并利用弱紫外光实现实际应用。我们一直致力于开发用于自清洁和除臭应用的光活性TiOiiD22ィエD2薄膜、油漆、纸张等。然后，高透明TiOiiD22ィエD2薄膜被开发为扩大其在高速公路隧道灯罩玻璃制造中的应用，这些隧道持续暴露于油性、含碳氢化合物的蒸气中。我们还发现，在微弱的紫外线照射下，TiOiiD22iiD2涂层瓷砖表面的大肠杆菌等多种细菌被杀死。我们继续进行一些现场测试，以确认光功能智能TiOiD22ィエD2材料的长期稳定性。为了研究TiOiD22ィエD2光催化的机理和动力学方面，我们最近开发了一种方法，使用位于每种类型表面附近的新型扫描微电极系统，可以在氧化和还原位点分别监测反应产物。在最新的工作中，我们使用了部分Pd覆盖的TiOiiD22ィエD2作为金属沉积光催化剂的模型，以观察在氧化和还原位点不存在和存在的情况下溶解氧的浓度变化。使用化学发光方法检查了空气中TiOiiD22iiD2薄膜光催化剂上形成的活性氧物种。我们能够。评估活性氧物种的时间依赖性行为，并区分短寿命活性物种和长寿命物种，后者可能是 OiiD22ィエD2。较少的