Fabrication of hierarchical BiOI/Bi2MoO6 heterojunction for degradation of bisphenol A and dye under visible light irradiation
Fabrication of hierarchical BiOI/Bi2MoO6 heterojunction for degradation of bisphenol A and dye under visible light irradiation
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DOI：
10.1016/j.jallcom.2015.02.064
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发表时间：
2015-06-15
影响因子：
6.2
通讯作者：
Du, Bin
中科院分区：
文献类型：
--
作者：
Yan, Tao;Sun, Meng;Du, Bin
采用快速沉淀-沉积法制备了一种新型的Bi2MoO6 / bi2mo6复合材料。采用x射线衍射（XRD）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、漫反射光谱（DRS）和x射线光电子能谱仪（XPS）对所制备的光催化剂进行了表征。所制备的Bi2MoO6 /Bi2MoO6复合材料在可见光照射下对水溶液中亚甲基蓝（MB）和双酚A （BPA）的降解表现出优异的光催化活性和稳定性。当bii含量为25%时，最佳复合材料对MB的光催化活性最高。增强的光催化活性主要是由于形成了bii /Bi2MoO6异质结，促进了光生载流子的分离和转移。通过使用不同类型的活性物质清除剂，讨论了活性物质在光催化过程中的作用。同时，结合光致发光（PL）和电化学阻抗谱（EIS）分析了光催化剂的降解机理。希望本研究能为设计性能更优异的特殊结构材料提供有价值的信息，并为进一步的工业应用奠定基础。(C) 2015 Elsevier B.V.版权所有
A novel hierarchical BiOI/Bi2MoO6 composites are prepared by a facile precipitation-deposition method. The prepared photocatalyst was characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), and X-ray photoelectron spectrometer (XPS). The resulting BiOI/Bi2MoO6 composites exhibit excellent photocatalytic activity and stability towards the degradation of methylene blue (MB) and bisphenol A (BPA) in aqueous solution under visible light irradiation. The optimal composite with 25% BiOI content shows the highest photocatalytic activity for MB degradation. The enhanced photocatalytic activity is mainly attributed to the formation of BiOI/Bi2MoO6 heterojunction that can facilitate the separation and transfer of the photo-generated charge carriers. The roles of active species in the photocatalytic process are discussed by using different types of active species scavengers. Meanwhile, combined with the photoluminescence (PL) and electrochemical impedance spectroscopy (EIS), the degradation mechanism of the photocatalysts is proposed. It is hoped that the work could provide valuable information on the design of specific structure materials with more excellent properties and set the foundation for the further industrial application. (C) 2015 Elsevier B.V. All rights reserved.