Tian Yue, Fang Ming, Xu Wei, Li Nian, Chen Yongzhou, Zhang Lide
Key Lab of Materials Physics, Anhui Key laboratory of Nanomaterials and Nanostructure, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, P. R. China.
J Nanosci Nanotechnol. 2011 Sep;11(9):7802-6. doi: 10.1166/jnn.2011.4740.
In this paper, the nanostructured Bi2WO6 with different hierarchical morphologies was synthesized via a warmly hydrothermal route. The structure and morphology of the as-prepared Bi2WO6 products were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), UV-vis absorption spectroscopy (UV-Vis) and N2-sorption analysis. The photocatalytic efficiency of Bi2WO6 was investigated by photodegradation of rhodamine B (RhB) under visible-light irradiation. The present work demonstrated that Bi2WO6 with four different hierarchical structures was effective visible-light-driven photocatalytic functional material for environmental purification. Moreover, the nest-like Bi2WO6 exhibited superior photocatalytic effects on rhodamine B degradation compared with other three Bi2WO6 morphologies. The excellent catalytic effect of the nest-like Bi2WO6 was attributed to its unique structural property and large surface area. The relationship between morphology and photocatalytic performance was discussed in detail. The photocatalytic mechanism for the degradation of RhB was also investigated, which revealed the important role of morphology in improving the photocatalyitc activities of Bi2WO6.
本文通过温和水热法合成了具有不同分级形貌的纳米结构Bi2WO6。采用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、紫外可见吸收光谱（UV-Vis）和N2吸附分析对所制备的Bi2WO6产物的结构和形貌进行了表征。通过在可见光照射下对罗丹明B（RhB）的光降解研究了Bi2WO6的光催化效率。目前的工作表明，具有四种不同分级结构的Bi2WO6是用于环境净化的有效的可见光驱动光催化功能材料。此外，与其他三种Bi2WO6形貌相比，巢状Bi2WO6对罗丹明B降解表现出优异的光催化效果。巢状Bi2WO6的优异催化效果归因于其独特的结构性质和大表面积。详细讨论了形貌与光催化性能之间的关系。还研究了RhB降解的光催化机理，揭示了形貌在提高Bi2WO6光催化活性中的重要作用。
