半导体光催化氧化技术的研究进展

Research and Development of Semiconductor Photocatalytic Oxidation Technique

作为一种高级氧化工艺,半导体光催化氧化技术能有效降解多种对环境有害的污染物,使污染物矿化为CO2、H2O及其他无机小分子物质 在诸多半导体光催化剂中,TiO2由于无毒、催化活性高、氧化能力强、稳定性好、成本低,成为最常用、也是最具潜力的一种光催化剂 阐述了TiO2光催化氧化的反应机理,介绍了决定TiO2光催化性能的因素及提高其活性的方法,总结了光催化反应器的发展及影响光催化反应效率的因素,并展望了半导体光催化氧化技术的前景。

As an advanced oxidation technology, the semiconductor photocatalytic oxidation can effectively degrade the environmental pollutants. The pollutants can be mineralized to CO2, H2O and other small molecules. Because it is nontoxic, highlyeffective, stable and of lowcost, TiO2 has become one of the most common and prospective semiconductor photocatalysts. In this study the principle of the TiO2based photocatalytic oxidation technique is described, the factors determining the activity of TiO2 and methods of improving its oxidation abilities are introduced. The development of the photoreactors and factors that influence the photocatalytic efficiency are summarized. At last, the prospect and research direction of this technique are discussed. 