Preparation and visible light photocatalytic activity of Bi2O3/Bi2WO6 heterojunction photocatalysts
Preparation and visible light photocatalytic activity of Bi2O3/Bi2WO6 heterojunction photocatalysts
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DOI：
10.1088/1755-1315/128/1/012086
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
C Y Yan;W. Yi;J. Xiong;J. Ma
中科院分区：
文献类型：
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作者：
C Y Yan;W. Yi;J. Xiong;J. Ma
采用一步水热法和两步水热法分别合成了Bi 2 O3纳米棒、花状Bi 2 WO 6和Bi 2 O3/Bi 2 WO 6异质结复合材料，其nBi：nW的摩尔比分别为2：1，2.5：1和3：1。采用X射线粉末衍射（XRD）、紫外-可见漫反射光谱（UV-vis DRS）和扫描电子显微镜（SEM）对产物进行了表征。光催化实验表明，与纯Bi 2 O3和Bi 2 WO 6相比，Bi 2 O3/Bi 2 WO 6复合材料具有更高的可见光催化降解罗丹明B的活性。Bi_2O_3/Bi_2WO_6异质结催化剂光催化活性的提高可以归因于光催化反应过程中光激发电子和空穴的复合减少。研究了nBi：nW摩尔比对催化剂性能的影响。采用一步水热法合成了nBi：nW的最佳摩尔比为2.5：1。
The Bi2O3 nanorods, flower-like Bi2WO6 and Bi2O3/Bi2WO6 heterojunction composites with the molar ratio of nBi:nW from 2:1, 2.5:1, to 3:1 have been synthesized via one-step hydrothermal method and two-step hydrothermal method, respectively. The products are characterized by powder X-ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy (UV-vis DRS), and scanning electron microscopy (SEM). Photocatalytic experiments indicate that such Bi2O3/Bi2WO6 composite possesses higher photocatalytic activity for RhB degradation under visible-light irradiation in comparison with pure Bi2O3 and Bi2WO6. The enhancement of the photocatalytic activity of the Bi2O3/Bi2WO6 heterojunction catalysts can be ascribed to the reduced recombination of the photoexcited electrons and holes during the photocatalytic reaction. The effect of the molar ratio of nBi:nW on the catalytic performance of the heterojunction catalysts was also investigated. And the optimal molar ratio of nBi:nW is 2.5:1 which was synthesized by one-step hydrothermal method.