晶面调控和新型二氧化钛纳米结构的研究进展-中国材料进展

文章信息/Info

Title:: Progress of Facet-Controlled and Novel Nanostructured Titanium Dioxide

作者:: 姚霞喜1; 2; 王文寿2; 1.常熟理工学院化学与材料工程学院，江苏常熟 215500
2.山东大学国家胶体材料工程技术研究中心，山东济南 250100

Author(s):: YAO Xiaxi1; 2; WANG Wenshou2; 1.School of Chemistry and Materials Engineering, Changshu Institute of Technology, Changshu 215500, China
2.National Engineering Research Center for Colloidal Materials, Shandong University, Jinan 250100, China

Keywords:: TiO2; facet; controlled; nanostructure; photocatalysis; photoreductive activity

摘要:: 太阳能光催化技术在缓解环境污染压力和能源危机方面有着重要的应用前景，纳米结构TiO2以其催化活性高、稳定性好、环境友好等特点在光催化领域受到广泛关注。近期研究表明，锐钛矿TiO2不同晶面能够有效地促进光激发载流子的空间分离转移。锐钛矿TiO2中光激发产生的电子倾向于迁移至（101）表面，而空穴则移动至（001）表面，从而通过晶面调控即可实现光生载流子的定向转移。另外，锐钛矿TiO2介晶是一类具有特殊结构和性质的纳米材料，其高的结晶性和大的比表面积有利于光催化反应的进行，多级TiO2纳米结构和具有特殊活性的TiO2也是目前研究的一个趋势。综述了几种高能量晶面暴露锐钛矿TiO2纳米晶、锐钛矿TiO2介晶以及多级复杂纳米结构TiO2的合成，分析了光催化剂结构对光催化性能的影响，重点探讨了晶面调控TiO2光催化的机理，总结了新兴发展的光还原活性TiO2的合成及其在可逆光致变色体系和光打印可擦写纸张领域的新型应用。

Abstract:: Solar photocatalysis has the potential applications for the control of environmental pollution and the alleviation of energy crisis. Nanostructured TiO2 has attracted an extensive attention owing to its good activity, high stability, and nontoxicity. Recently, anatase TiO2 with exposed highenergy facets can efficiently promote the separation of photoexcited charge carriers. The photoinduced electrons in anatase TiO2 tend to migrate to (101) facets, while photoexcited holes transfer to (001) facets. In addition, anatase TiO2 mesocrystals are one kind of nanomaterials with special structures and properties. High crystallity and large surface area of mesocrystals are favorable for the photocatalysis. Furthermore, researchers also focus on hierarchical or highly active TiO2. This review summarized the synthesis of several nanostructured TiO2 with highenergy facets, anatase TiO2 mesocrystals and hierarchical TiO2, analyzed the effect of morphology on the photocatalytic activity, discussed the photocatalytic mechanism of TiO2 with different exposed facets, and presented the synthesis of anatase TiO2 nanoparticles with photoreductive activity and their application in photoreversible color switching and rewritable paper.