高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (5): 941-948.doi: 10.7503/cjcu20131114

• 研究论文: 无机化学 • 上一篇    下一篇

MoO3/V2O5异质结构材料的静电纺丝法制备及光催化性能

揣宏媛, 周德凤(), 朱晓飞, 杨国程, 李朝辉   

  1. 长春工业大学化学与生命科学学院, 长春 130012
  • 收稿日期:2013-11-18 出版日期:2014-05-10 发布日期:2014-04-14
  • 作者简介:联系人简介: 周德凤, 女, 博士, 教授, 主要从事无机固体材料的研究. E-mail:defengzhou65@126.com
  • 基金资助:
    国家自然科学基金(批准号: 20871023)、 吉林省科技发展计划项目(批准号: 20101549, 20130102001JC)和吉林省教育厅项目(批准号: 2013130, 2013146)资助

Electrospinning Preparation and Visible-light Photocatalytic Activity of MoO3/V2O5 Heterostructures

CHUAI Hongyuan, ZHOU Defeng*(), ZHU Xiaofei, YANG Guocheng, LI Zhaohui   

  1. School of Chemistry and Life Science, Changchun University of Technology, Changchun 130012, China
  • Received:2013-11-18 Online:2014-05-10 Published:2014-04-14
  • Contact: ZHOU Defeng E-mail:defengzhou65@126.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.20871023), the Development of Science and Technology Plan of Jilin Province, China(Nos.2010549, 20130102001JC) and the Program of Jilin Provincial Education Department, China(Nos.2013130, 2013146)

摘要:

以聚乙烯吡咯烷酮(PVP)、 四水合钼酸铵[(NH4)6Mo7O24·4H2O]和偏钒酸铵(NH4VO3)为原料, 利用静电纺丝技术结合溶胶-凝胶法制备了在可见光区具有高光催化活性的MoO3/V2O5异质结构半导体光催化剂. 采用X射线衍射光谱(XRD)、 傅里叶变换红外光谱(FTIR)、 场发射扫描电子显微镜(FE-SEM)、 X射线光电子能谱(XPS)和紫外-可见(UV-Vis)漫反射光谱等测试手段对材料进行了表征. 以光降解亚甲基蓝(MB)为模型反应, 考察了MoO3/V2O5异质结构材料的光催化性能. 结果表明, n(Mo)/n(V)>1∶8时均能形成MoO3/V2O5异质结构且带隙明显宽于V2O5, 可有效地实现光生电子和空穴的分离, 增强体系的量子效率, 促进光催化活性的提高, 其中n(Mo)/n(V)=1∶6时光催化活性最高(达到97.24%), 并分析和探讨了光催化机理.

关键词: 光催化剂, 异质结构, 静电纺丝法, MoO3/V2O5

Abstract:

MoO3/V2O5 heterostructures with high photocatalytic activity in visible light region were synthesized via electrospinning technique and sol-gel process. The morphologies and structures of MoO3/V2O5 heterostructures were characterized by X-ray diffraction, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and UV-visible diffuse reflectance spectroscopy. The photocatalytic performances of MoO3/V2O5 heterostructures were evaluated by the photodegradation of methylene blue(MB) under visible light irradiation. The results indicated that heterojunctions between MoO3 and V2O5 were formed when the n(Mo)/n(V) ratio was above 1∶8, and the separation of photogenerated electron-hole pairs on MoO3/V2O5 heterostructures was promoted, which made the decolorization rate of MB by MoO3/V2O5 heterostructures much higher than usage of pure V2O5 nanofibers. The optimum n(V)/n(Mo) ratio of MoO3/V2O5 heterostructures was found to be about 1∶6 and the decolorization rate of MB could be reached 97.24%. In addition, the photocatalytic mechanism of the MoO3/V2O5 heterostructures was further analyzed and discussed.

Key words: Photocatalyst, Heterostructures, Electrospinning, MoO3/V2O5

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