Facile hydrothermal synthesis and photocatalytic activity of bismuth tungstate hierarchical hollow spheres with an ultrahigh surface area
Facile hydrothermal synthesis and photocatalytic activity of bismuth tungstate hierarchical hollow spheres with an ultrahigh surface area
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DOI：
10.1039/b923443h
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发表时间：
2010-01-01
影响因子：
4
通讯作者：
Fu, Shao-Yun
中科院分区：
文献类型：
--
作者：
Dai, Xiao-Jun;Luo, Yong-Song;Fu, Shao-Yun
钨酸铋作为一种新型的可见光光催化剂，引起了人们的广泛关注。在聚乙烯吡咯烷酮（PVA）存在下，通过水热法在合适的C（2）H（5）OH/CH（3）COOH/H（2）O体积比条件下合成了具有高比表面积的Bi（2）WO（6）多级结构空心球.采用X射线粉末衍射、扫描电镜、透射电镜、BET和紫外-可见吸收光谱对产物进行了系统的表征。结果表明，Bi（2）WO（6）空心球由大量纳米片构成，而纳米片由大量纳米颗粒组成。利用紫外-可见光谱估算了Bi（2）WO（6）空心球的带隙能量（约2.90 eV）。Ca的BET比表面积。45.0 m（2）g（-1），远高于以往报道的Bi（2）WO（6）系列空心球的m（2）g（-1）。在可见光照射下，Bi（2）WO（6）多级空心球对罗丹明B（RhB）的光催化降解性能上级其它形貌的空心球.
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.