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首页> 外文会议>Progress in environmental science and technology.;vol. 3. >Heterogeneous and Homogeneous Photocatalysis for the Redox Conversion of Aquatic Pollutants
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Heterogeneous and Homogeneous Photocatalysis for the Redox Conversion of Aquatic Pollutants

机译：非均相和均相光催化水污染物的氧化还原转化

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摘要

Solar energy utilization through heterogeneous and homogeneous photocatalysis has been intensively investigated for the redox conversion of aquatic pollutants. Heterogeneous photocatalysis using semiconductor oxide nanoparticles is a useful device for this purpose since the reactive oxygen species such as hydroxyl radicals and superoxides can be generated on the illuminated catalyst surface under the ambient condition. In particular, TiO2 is the most important base material for environmental photocatalysis and its photocatalytic activity has been demonstrated for a wide variety of organic and inorganic pollutants. The photocatalytic reaction rate and mechanism of pollutants degradation can be controlled by modifying the oxide nanoparticles. Various modification methods such as platinization, fluorination, dye sensitization, and surface complexation are introduced and their effects on the photocatalytic reactions are discussed. On the other hand, polyoxometallate (POM: metal-oxygen cluster anion) can be also utilized as a homogeneous photocatalyst that oxidizes organic compounds like TiO2. POM can be utilized as an electron-transfer mediating catalyst in many redox processes as well. Several examples of POM applications in environmental systems are introduced. The photocatalytic oxidation and reduction reactions carried out by POM are described and compared with those of TiO2 to discuss the similarities and differences. Finally, the iodide-mediated photocatalytic conversion of arsenite is described.
机译：对于水生污染物的氧化还原转化，已经广泛研究了通过非均相和均相光催化利用太阳能。使用半导体氧化物纳米颗粒的非均相光催化是用于此目的的有用装置，因为在环境条件下，可在被照亮的催化剂表面上产生诸如氢氧根和超氧化物之类的活性氧。特别地，TiO 2是环境光催化的最重要的基础材料，并且已经证明了其对多种有机和无机污染物的光催化活性。可以通过修饰氧化物纳米颗粒来控制光催化反应速率和污染物降解机理。介绍了各种修饰方法，如镀铂，氟化，染料敏化和表面络合，并讨论了它们对光催化反应的影响。另一方面，多金属氧酸盐（POM：金属-氧簇阴离子）也可用作氧化有机化合物（如TiO2）的均相光催化剂。在许多氧化还原工艺中，POM也可用作电子转移介导催化剂。介绍了POM在环境系统中的几个示例。描述了由POM进行的光催化氧化和还原反应，并将其与TiO2进行比较以讨论异同。最后，描述了碘化物介导的亚砷酸盐的光催化转化。

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