Photocatalytic performances of BiFeO3 particles with the average size in nanometer, submicrometer, and micrometer
Photocatalytic performances of BiFeO3 particles with the average size in nanometer, submicrometer, and micrometer
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DOI：
10.1016/j.materresbull.2013.11.039
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发表时间：
2014-02
影响因子：
5.4
通讯作者：
Chunxue Hao;FushengWen;J. Xiang;H. Hou;Weiming Lv;Yifei Lv;Wentao Hu;Zhongyuan Liu
中科院分区：
文献类型：
--
作者：
Chunxue Hao;FushengWen;J. Xiang;H. Hou;Weiming Lv;Yifei Lv;Wentao Hu;Zhongyuan Liu
采用三种不同的合成路线成功地制备了形貌不同、平均尺寸分别为50、500和15μm的BiFeO_3粒子。晶体结构为扭曲的菱面体结构，空间群为R3c。随着粒径的减小，拉曼活性带的峰强度和峰位红移明显减小。从UV-Vis吸收光谱确定了BiFeO_3的窄禁带，表明BiFeO_3具有半导体性质。在BiFeO_3存在的可见光照射下，染料的光催化效率随着粒径的减小而迅速提高，这可能是由于更多的表面活性催化中心和更短的载体距离迁移到表面反应中心所致。
Three different synthesis routes were taken to successfully prepare the BiFeO3particles with the different morphologies and average size in 50, 500 nm, and 15 μm, respectively. The crystal structure was recognized to be a distorted rhombohedral one with the space group R3c. With the decrease in particle size, obvious decrease in peak intensity and redshift in peak position were observed for the Raman active bands. The narrow band gap was determined from the UV–vis absorption spectra, indicating the semiconducting nature of the BiFeO3. For photodegradation of dyes under visible irradiation in the presence of BiFeO3, the photocatalytic efficiency increased quickly with the decrease in size which may attribute to more surface active catalytic-sites and shorter distances carriers had to migrate to the surface reaction sites.