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首页> 外文期刊>Journal of Materials Science: Materials in Electronics >High efficient ultraviolet photocatalytic activity of BiFeO3 nanoparticles synthesized by a chemical coprecipitation process
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High efficient ultraviolet photocatalytic activity of BiFeO3 nanoparticles synthesized by a chemical coprecipitation process

机译：化学共沉淀法合成BiFeO 3 纳米粒子的高效紫外光催化活性

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摘要

Single-crystalline BiFeO3 nanoparticles have been synthesized through a simple chemical coprecipitation process using bismuth and iron nitrates. By employing both X-ray diffraction and electron diffraction, the nanoparticles were unambiguously identified to have a rhombohedrally distorted perovskite structure. X-ray photoelectron spectroscopy investigation shows that Fe element exists as the Fe3+ valence state in the BiFeO3 nanoparticles. UV–Vis absorption spectrum indicates that the absorption cut-off wavelength of the nanoparticles is about 580 nm, corresponding to the energy bandgap of 2.10 eV. The BiFeO3 nanoparticles exhibited an efficient ultraviolet photocatalytic activity, more than 92% of methyl orange was decolorized after 260 min UV irradiation. Unexpectedly, the BiFeO3 nanoparticles do not show any efficient visible light photocatalytic activity, although the nanoparticles absorb visible light in the wavelength range of 400–580 nm.
机译：通过使用铋和硝酸铁的简单化学共沉淀过程合成了单晶BiFeO 3 纳米颗粒。通过同时使用X射线衍射和电子衍射，可以毫不含糊地确定纳米颗粒具有菱形扭曲的钙钛矿结构。 X射线光电子能谱研究表明，BiFeO 3 纳米颗粒中Fe元素以Fe 3 + 价态存在。 UV-Vis吸收光谱表明，纳米粒子的吸收截止波长约为580 nm，对应于2.10 eV的能带隙。 BiFeO 3 纳米粒子表现出有效的紫外光催化活性，在260分钟的紫外线照射后，超过92％的甲基橙被脱色。出乎意料的是，尽管BiFeO 3 纳米粒子吸收了400-580 nm波长范围内的可见光，却没有任何有效的可见光光催化活性。

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