（毕业设计论文）《掺杂纳米二氧化钛光催化降解聚苯乙烯的研究》.doc

摘要 PAGE IV 掺杂纳米二氧化钛光催化降解聚苯乙烯的研究 摘 要 TiO2是一种高效的光催化剂，在紫外光照下，它能将空气中和水中的有机污染物降解为CO2和H2O，很有可能成为一种处理环境污染物的有效方法。而纳米级TiO2因其廉价、活性高、稳定性好而在污染物治理领域被广泛用做光催化剂。但其光响应范围窄、光量子效率较低、光生电子和空穴易发生复合等缺点，限制了纳米TiO2光催化材料的实际应用和发展。 改性后的纳米TiO2 具有较高的催化活性和光量子产率。本文综述了单一元素对纳米TiO2 的掺杂及多种元素的掺杂，研究表明，多种元素掺杂改性的纳米TiO2对可见光的吸收明显增加，对于在可见光下PS的光催化降解多种元素掺杂的纳米TiO2较单一元素掺杂的纳米TiO2催化活性高，共同掺杂起到良好的协同作用，提高了光催化活性。 最后对本次研究进行了总结，针对当前光催化剂方面研究进展，对以后的纳米TiO2降解PS进行了展望。 关键词：聚苯乙烯，光催化降解，纳米TiO2，掺杂 Doped titanium dioxide photocatalytic degradation of polystyrene ABSTRACT TiO2 is an efficient photocatalyst under ultraviolet irradiation, it will be air and water, degradation of organic pollutants in CO2 and H2O, is likely to be an effective way to deal with environmental pollutants. The nano-TiO2 for its cheap, high activity, good stability in the field of pollution control has been widely used as photocatalyst. But the narrow scope of its optical response, optical quantum efficiency is low, the light electrons and holes prone compound the disadvantages of nano-TiO2 limit the practical application of photocatalytic materials and development. Modified nano-TiO2 has higher catalytic activity and quantum yield. In this paper, a single element on a variety of nano-TiO2 doped and the doping elements, research shows that many elements of doped TiO2 nano significantly increased the absorption of visible light, for the PS in the visible light photocatalytic degradation of a variety of Nano TiO2 doping elements than a single nanometer TiO2 doped with catalytic activity, the synergistic co-doped play a good role in enhancing the photocatalytic activity. ?Finally, a summary of this study, photocatalytic aspects of the current research progress, the future of nano-TiO2 on the degradation of PS were discussed.  KEY WORDS: polystyrene，photocatalytic degradation，nano TiO2，Doping 前言 目　录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc293948745 前　言 PAGEREF _Toc293948745 \h 1 HYPERLINK \l _Toc293948746 第1章 PS的降解机理 PAGEREF _Toc293948746 \h 2 HYPERLI