Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Dalton Trans. 2010 Apr 14;39(14):3426-32. doi: 10.1039/b923443h. Epub 2010 Mar 4.
Bismuth tungstate has attracted great attention as a new photocatalyst working under visible irradiation. In this paper, we demonstrate a facile hydrothermal route for controllable synthesis of novel Bi(2)WO(6) hierarchical hollow spheres with an ultrahigh specific surface area in the presence of poly(vinyl pyrrolidone) at a proper C(2)H(5)OH/CH(3)COOH/H(2)O volume ratio. The obtained products are systematically studied by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Teller (BET) and UV-vis absorption spectroscopy. It is shown that the Bi(2)WO(6) hollow spheres are constructed of numerous nanoplates while the nanoplates consist of a great deal of nanoparticles. UV-vis spectrum is used to estimate the band gap energy (about 2.90 eV) of the Bi(2)WO(6) hollow spheres. The ultrahigh BET specific surface area of ca. 45.0 m(2) g(-1) is displayed for the Bi(2)WO(6) hierarchical hollow spheres, which is much higher than that for all the previously reported Bi(2)WO(6) products. The Bi(2)WO(6) hierarchical hollow spheres are displayed to possess superior photocatalytic activity in the photodegradation of rhodamine B (RhB) under visible light irradiation over other morphological products.
钨酸铋作为一种在可见光照射下工作的新型光催化剂，引起了极大的关注。在本文中，我们展示了一种在聚维酮存在下，通过简单的水热法可控合成具有超高比表面积的新型 Bi(2)WO(6)分级空心球的方法，在适当的 C(2)H(5)OH/CH(3)COOH/H(2)O 体积比下。通过 X 射线粉末衍射、扫描电子显微镜、透射电子显微镜、BET 和紫外可见吸收光谱对所得产物进行了系统研究。结果表明，Bi(2)WO(6)空心球由许多纳米板构成，而纳米板由大量纳米颗粒组成。紫外可见光谱用于估算 Bi(2)WO(6)空心球的能带隙能（约 2.90 eV）。Bi(2)WO(6)分级空心球的 BET 比表面积高达约 45.0 m(2) g(-1)，远高于以前报道的所有 Bi(2)WO(6)产物。Bi(2)WO(6)分级空心球在可见光照射下对罗丹明 B（RhB）的光降解表现出优异的光催化活性，优于其他形态的产物。
