School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, People's Republic of China.
Nanotechnology. 2011 Jul 1;22(26):265601. doi: 10.1088/0957-4484/22/26/265601. Epub 2011 May 17.
Hierarchical nanostructured Bi(2)WO(6) micro-clews were synthesized by a solvothermal process with mixed solvents and formaldehyde. The hierarchical Bi(2)WO(6) micro-clews, with an average diameter of ca. 1.0 µm, consisted of nano-sheets assembled in a special fashion and the formation process mainly went through an Ostwald ripening-anisotropic growth and self-assembling process. The Bi(2)WO(6) micro-clews were further modified by Bi(2)O(3) to fabricate heterojunction photocatalysts, where Bi(2)O(3) nanoparticles were uniformly assembled on the surface of Bi(2)WO(6) nano-sheets. Compared with pure Bi(2)WO(6) and Bi(2)O(3), the composite photocatalyst exhibits higher photocatalytic activity for the degradation of rhodamine B under visible light. On the basis of characterization by x-ray diffraction, photoluminescence and UV-vis diffuse reflectance spectroscopies, a mechanism was proposed to account for the enhanced photocatalytic activity of the Bi(2)O(3)/Bi(2)WO(6) heterojunction.
采用混合溶剂和甲醛的溶剂热法合成了具有分级纳米结构的 Bi(2)WO(6)微束。这种具有分级结构的 Bi(2)WO(6)微束的平均直径约为 1.0 µm，由纳米片以特殊的方式组装而成，其形成过程主要经历了奥斯特瓦尔德熟化-各向异性生长和自组装过程。Bi(2)WO(6)微束进一步用 Bi(2)O(3)修饰，制备出异质结光催化剂，其中 Bi(2)O(3)纳米颗粒均匀地组装在 Bi(2)WO(6)纳米片的表面。与纯 Bi(2)WO(6)和 Bi(2)O(3)相比，该复合光催化剂在可见光下降解罗丹明 B 的光催化活性更高。基于 X 射线衍射、光致发光和紫外-可见漫反射光谱的表征，提出了一种机制来解释 Bi(2)O(3)/Bi(2)WO(6)异质结增强的光催化活性。
