硼氢化钠还原的铋铁氧体纳米颗粒对罗丹明B脱色的光催化活性增强
Enhanced Photocatalytic Activity of NaBH₄ Reduced BiFeO₃ Nanoparticles for Rhodamine B Decolorization.
作者信息
Di Lijing, Yang Hua, Xian Tao, Chen Xiujuan
机构信息
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China.
College of Physics and Electronic Information Engineering, Qinghai Normal University, Xining 810008, China.
出版信息
Materials (Basel). 2017 Sep 22;10(10):1118. doi: 10.3390/ma10101118.
In this work, oxygen vacancies were introduced onto the surface of BiFeO₃ nanoparticles by NaBH₄ reduction method to yield oxygen-deficient BiFeO samples. Comprehensive analysis on the basis of high-resolution transmission electron microscopy (HRTEM) observation and X-ray photoelectron spectrum (XPS) confirms the existence of surface oxygen vacancies on the BiFeO nanoparticles. The photocatalytic activity of as-prepared BiFeO samples was evaluated by the decolorization of rhodamine B (RhB) under simulated sunlight irradiation. The experimental results indicate that the photocatalytic activity of samples is highly related to the NaBH₄ reduction time, and the BiFeO sample reduced for 40 min exhibits the highest photocatalytic efficiency, which is much higher than that of pristine BiFeO₃ nanoparticles. This can be explained by the fact that the surface oxygen vacancies act as photoinduced charges acceptors and adsorption sites suppress the recombination of photogenerated charges, leading to an increasing availability of photogenerated electrons and holes for photocatalytic reaction. In addition, the obtained BiFeO sample exhibits good photocatalytic reusability.
在本工作中，通过硼氢化钠还原法将氧空位引入到BiFeO₃纳米颗粒表面，以制备缺氧的BiFeO样品。基于高分辨率透射电子显微镜（HRTEM）观察和X射线光电子能谱（XPS）的综合分析证实了BiFeO纳米颗粒表面存在氧空位。通过在模拟太阳光照射下罗丹明B（RhB）的脱色来评估所制备的BiFeO样品的光催化活性。实验结果表明，样品的光催化活性与硼氢化钠还原时间高度相关，还原40分钟的BiFeO样品表现出最高的光催化效率，远高于原始的BiFeO₃纳米颗粒。这可以通过以下事实来解释：表面氧空位作为光生电荷受体和吸附位点，抑制了光生电荷的复合，导致光催化反应中光生电子和空穴的可用性增加。此外，所获得的BiFeO样品表现出良好的光催化可重复使用性。
Zotero 插件