Enhanced photocatalytic activity of Ba doped BiFeO 3 by turning morphologies and band gap
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Enhanced photocatalytic activity of Ba doped BiFeO3 by turning morphologies and band gap Yaowen Zhang1 · Yonghang Yang1 · Zhichen Dong3 · Junchen Shen1 · Qinxin Song1 · Xingfu Wang1 · Weiwei Mao1,2 · Yong Pu1 · Xing’ao Li1,2,3 Received: 7 May 2020 / Accepted: 21 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The application of BiFeO3 (BFO) in the treatment of environmental water pollution is very important. In this paper, Ba-doped bismuth ferrite series nanomaterials were prepared by sol–gel method. The results of X-ray diffraction show the evolution of the crystal structure by doping of Ba, while it can be seen by scanning electron microscopy that the doping reduces the grain size gradually. The band gap gets narrow after doping with Ba, result in high efficiency for the degradation of methyl orange under visible light irradiation. Furthermore, it is found that the ferromagnetism increases with the increase of Ba doping. Therefore, the BFO-based photocatalyst can be obtained by Ba doping with good performance.
1 Introduction Nowadays, the only fresh water resources we have, is suffering from domestic sewage, industrial waste water and the early rain, water has become a dangerous, always endangering human health. Therefore, convenient and efficient sewage treatment has become one of the world’s major issues to be urgently solved. Photocatalytic technology mainly uses to degrade pollutants through reduction or oxidation of ultraviolet or visible light irradiation [1–3]. In this respect, BiFeO3 (BFO), as a new visible light responsive semiconductor photocatalytic material, has gradually demonstrated
* Weiwei Mao [email protected] * Yong Pu [email protected] * Xing’ao Li [email protected] 1
New Energy Technology Engineering Laboratory of Jiangsu Province & School of Science, Nanjing University of Posts and Telecommunications (NJUPT), Nanjing 210023, China
2
National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
3
Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing 210023, China
its advantages in new energy and environmental pollution control [4–6]. Perovskite-type BFO is one of the few multiferroic materials with both ferroelectricity and weak ferromagnetism at room temperature [7, 8]. In addition to the application of magnetoelectric properties, BiFeO3 has a good photocatalytic application prospect due to its narrow band gap (2.2 eV) and high physical stability [5]. BFO synthesized by hydrothermal method can improve the photocatalytic performance by changing the alkaline environment of hydrothermal reaction or adding surfactant to modify the morphology [9–11]. In addition, ion doping is also an effective means to improve the photocatalytic performance. For example, the Gd-doped BFO nanoparticles prepared by sol–gel method not onl
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