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Assembly of the photocatalytic membrane having mesoscopic structure

具有介观结构的光催化膜的组装

基本信息

批准号：
12555184
负责人：
FUJISHIMA Akira
金额：
$ 8.51万
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：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

The effective applications of clean photovoltaic energy has become one of the most important project in the world-wide scale environment and energy problem. Titanium dioxide (TiO_2), a semiconductor with produces electron-hole pair under irradiation, has attracted much attention as a photocatalytic system. One of the promising system is a 2 phased TiO_2-dye sensitized system. Based on theoretical research, materials with mesoscopic structure are found to have the most efficient light energy use. In this present study, various size of small particles were used to fabricate a 2 dimensional highly ordered structure (small particle array) mold. The mesoscopic TiO_2 semiconductor with pthotocatalytic oxidation-reduction ability was used to deal with kinds of environmental problems.These are shown concretely below.1. Fabrication of the highly dense and highly arranged TiO_2 mesoscopic structure by spray pyrolisis method and the characterization of the packing density - The structure was fabr … More icated by spray pyrolisis method while the sol concentration, spraying rate, annealing temperature were controlled. The fabricated structure was observed by use of scanning electron microscopy and the packing condition was characterized by fourier transform.2. Investigation oxidation reduction ability of TiO_2 mesoscopic structure - The reduction ability of fabricated structure examined by silver nitrate has been reported. Therefore, in the present study, only the sustention of the oxidation ability are examined by analyzing the SEM of oxidatively polymerized conducting pyrrole.3. Investigation of meso-hole-size dependent substance decomposition - By changing the size of the photocatalytic reaction site of the structure, the effect of the condensed phase in the oxidation-reduction ability was examined. It was predicated that the decomposited and fabricated substance was different due to the distribution and the thickness of the condensed phase and the charge of nucleic acid, quantitative analysis was performed by using a highly sensitive gas chromatography.4. The selective metal modification on TiO_2 structure - To obtain a high light energy converse efficiency based on the oxidation-reduction reaction, the recombination of electron produced at the oxidation site and hole produced at the reduction site needs to be suppressed. Accordingly, the modification of metal with a similar band to promote electron movement is effective. By applying a vacuum field, the metal will stick only to the spherical reaction site. Therefore, palladium which is commonly used as the metal was examined as a material with separated oxidation and reaction site. Less

清洁光伏能源的有效应用已成为世界范围内环境与能源问题的重要课题之一。二氧化钛（TiO_2）是一种在光照射下产生电子-空穴对的半导体材料，作为一种光催化体系受到了广泛的关注。其中最有前途的体系之一是两相TiO_2-染料增感体系。通过理论研究发现，具有介观结构的材料具有最有效的光能利用率。在本研究中，使用各种尺寸的小颗粒来制造二维高度有序结构（小颗粒阵列）模具。具有光催化氧化还原能力的介观TiO_2半导体被用于处理各种环境问题，具体表现在以下几个方面.喷雾热解法制备高密度、高排列的TiO_2介观结构及其堆积密度的表征 ...更多信息通过控制溶胶浓度、喷涂速率、退火温度等工艺条件，采用喷雾热解法制备了纳米晶。利用扫描电子显微镜对制备的结构进行了观察，并通过傅立叶变换对组装情况进行了表征. TiO_2介观结构氧化还原性能的研究--报道了用硝酸银测试制备结构的还原性能。因此，本研究仅以氧化聚合导电吡咯之SEM分析来探讨其氧化能力之维持.介孔尺寸依赖性物质分解的研究-通过改变结构的光催化反应部位的尺寸，检查凝聚相在氧化还原能力中的效果。预测了由于凝聚相的分布、厚度以及核酸的电荷不同，分解产物和合成产物不同，并采用高灵敏度的气相色谱进行了定量分析.对TiO_2结构的选择性金属修饰--为了获得基于氧化还原反应的高光能匡威效率，需要抑制在氧化位点产生的电子和在还原位点产生的空穴的复合。因此，用类似的能带对金属进行改性以促进电子运动是有效的。通过施加真空场，金属将仅粘在球形反应位点上。因此，通常用作金属的钯作为具有分离的氧化和反应位点的材料进行了研究。少