Novel urea assisted hydrothermal synthesis of hierarchical BiVO4/Bi2O2CO3 nanocomposites with enhanced visible-light photocatalytic activity
Novel urea assisted hydrothermal synthesis of hierarchical BiVO4/Bi2O2CO3 nanocomposites with enhanced visible-light photocatalytic activity
复制标题
新型尿素辅助水热合成分级 BiVO4/Bi2O2CO3 纳米复合材料，具有增强的可见光催化活性
DOI：
10.1016/j.apcatb.2011.09.014
复制
发表时间：
2011-11-02
影响因子：
22.1
通讯作者：
Liu, Gang
中科院分区：
文献类型：
--
作者：
Madhusudan, Puttaswamy;Ran, Jingrun;Liu, Gang
以尿素为形态介质，首次采用水热法合成了具有反应性晶面的BiVO4/Bi2O2CO3纳米复合材料。采用x射线衍射、扫描电镜、透射电镜、x射线光电子能谱、拉曼光谱、傅里叶变换红外光谱对制备的样品进行了表征。N-2吸收-解吸等温线和紫外-可见漫反射光谱。对制备的样品在可见光下降解罗多明B （RhB）的光催化活性进行了评价。研究结果表明，合成过程中尿素浓度和反应时间可以调节BiVO4/Bi2O2CO3纳米复合材料的物理参数和光催化活性。随着尿素浓度的增加，比表面积、孔体积和平均孔径增大。与BiVO4和Bi2O2CO3相比，BiVO4/Bi2O2CO3纳米复合材料具有更强的光催化降解RhB活性。讨论了BiVO4/Bi2O2CO3纳米复合材料的形成机理和增强的光反应性。(C) 2011 Elsevier B.V.版权所有
A novel hydrothermal approach is developed for the first time to synthesize hierarchical BiVO4/Bi2O2CO3 nanocomposites with reactive crystalline facets using urea as a morphology mediator. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy. N-2 absorption-desorption isotherms and UV-visible diffuse reflectance spectroscopy. The photocatalytic activity of the as-prepared samples was evaluated towards degradation of Rhodomine B (RhB) by visible-light. Our results indicate that both physical parameters and associated photocatalytic activity of BiVO4/Bi2O2CO3 nanocomposites can be tuned by urea concentration and reaction time in the synthesis process. With increasing urea concentration, the specific surface area, pore volume and average pore size increase. Compared to BiVO4 and Bi2O2CO3 bulk counterpart, BiVO4/Bi2O2CO3 nanocomposites show enhanced photocatalytic degradation activity of RhB. The mechanisms for the formation of BiVO4/Bi2O2CO3 nanocomposites and enhanced photoreactivity are discussed. (C) 2011 Elsevier B.V. All rights reserved.