Ag/Bi2WO6 plasmonic composites with enhanced visible photocatalytic activity
Ag/Bi2WO6 plasmonic composites with enhanced visible photocatalytic activity
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Ag/Bi2WO6 等离子体复合材料具有增强的可见光催化活性
DOI：
10.1016/j.ceramint.2013.11.102
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发表时间：
2014-06
影响因子：
5.2
通讯作者：
Zhu, Zhenfeng
中科院分区：
文献类型：
--
作者：
Li, Junqi;Guo, Zhanyun;Zhu, Zhenfeng
以五水合硝酸铋和二水合钨酸钠为原料，采用简易水热法制备了直径约4μm的三维花状Bi2WO6微球。通过一种简单实用的光还原方法合成了一种新型的银修饰的Bi2WO6。UV-Vis漫反射光谱表明，由于Ag纳米粒子在Bi2WO6表面的表面等离子体共振(SPR)作用，Ag/Bi2WO6样品在可见光区域的光吸收比纯Bi2WO6微球有显著的增强。通过对罗丹明B在模拟太阳光照射下的脱色实验，评价了所制备的样品的光催化活性。结果表明，随着载银量的增加，Ag/Bi2WO6样品的光催化活性呈现先升后降的趋势，其中载银量为1.0wt%的Bi2WO6样品的光催化活性最好。光催化活性的提高可以归因于较强的表面等离子体共振效应和银纳米粒子对光生电子和空穴的有效分离的协同作用。
Three-dimensional flower-like Bi2WO6microspheres with the diameter of about 4 μm were prepared by a facile hydrothermal method using bismuth nitrate pentahydrate and sodium tungstate dihydrate as raw materials. A novel Ag-modified Bi2WO6was synthesized through a simple and practical photoreduction process. The UV–vis diffuse reflectance spectra indicate that the Ag/Bi2WO6samples have a significantly enhanced optical absorption in the visible light region than that of pure Bi2WO6microspheres due to the surface plasmon resonance (SPR) of Ag nanoparticles on the surface of pure Bi2WO6. The photocatalytic activities of the as-prepared samples were evaluated by the decolorization of rhodamine B under simulated sun-light irradiation. The results reveal that the photocatalytic activities of the Ag/Bi2WO6samples increase first and then decrease with increasing amount of loading Ag and the 1.0 wt% Ag-loaded Bi2WO6sample exhibits the best photocatalytic activity compared with the other samples. The enhanced photocatalytic activity could be attributed to the synergistic effect of the strong SPR and the effective separation of photogenerated electrons and holes caused by Ag nanoparticles.
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