Synthesis and comparison of photocatalytic properties for Bi2WO6 nanofibers and hierarchical microspheres
Synthesis and comparison of photocatalytic properties for Bi2WO6 nanofibers and hierarchical microspheres
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DOI：
10.1016/j.jallcom.2016.10.188
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发表时间：
2017-02
影响因子：
6.2
通讯作者：
Aimin Yang;Yang Han;S. Li;Hongwei Xing;Yu-Hang Pan;Weixing Liu
中科院分区：
文献类型：
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作者：
Aimin Yang;Yang Han;S. Li;Hongwei Xing;Yu-Hang Pan;Weixing Liu
采用静电纺丝法和水热法合成了Bi 2 WO 6纳米纤维和分级微球。研究了Bi 2 WO 6光催化剂的物相、微观结构和光催化性能。X射线粉末衍射和傅里叶变换红外光谱分析表明，Bi 2 WO 6纳米纤维和分级微球均为单斜方晶相。扫描电子显微镜和透射电子显微镜图像显示Bi 2 WO 6纳米纤维由纳米颗粒组成，Bi 2 WO 6纳米微球由大量纳米片组成。Barrett-Emmett-Teller结果、X射线光电子能谱、紫外-可见漫反射光谱、发射光谱、光电流和电化学阻抗谱表明Bi 2 WO 6分级微球比Bi 2 WO 6纳米纤维具有更高的光催化活性。这通过罗丹明B在光照射下的光分解得到证实。Bi 2 WO 6分级微球在光照下对罗丹明B具有更快、更高的降解效率。Bi 2 WO 6分级微球的比表面积较大，具有较高的光催化活性。大的比表面积提供了更多的表面活性位点，并使电荷载流子传输更容易。
Bi2WO6nanofibers and hierarchical microspheres were synthesized by an electrospinning process and a hydrothermal method. The phase, microstructure and photocatalytic performance of the obtained Bi2WO6photocatalysts were investigated. The X-ray powder diffraction and Fourier transform infrared spectroscopy suggest that Bi2WO6nanofibers and hierarchical microspheres have the single orthorhombic phase. The scanning electron microscope and transmission electron microscope images show that Bi2WO6nanofibers are composed of nanoparticles and Bi2WO6hierarchical microspheres consist of a large number of nanosheets. The Barrett−Emmett−Teller results, X-ray photoelectron spectroscopy, ultraviolet–visible diffuse reflectance spectra, emission spectra, photocurrent and electrochemical impedance spectroscopy reveal that Bi2WO6hierarchical microspheres have a higher photocatalytic activity than that of Bi2WO6nanofibers. This is confirmed by the photo decomposition of Rhodamine B under light irradiation. The Bi2WO6hierarchical microspheres show a faster and higher efficiency decomposition of Rhodamine B under light irradiation. The higher photocatalytic activity of Bi2WO6hierarchical microspheres results from the larger specific surface area. The large specific surface area provides more surface active sits and makes an easier charge carrier transport.