高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (4): 771-778.doi: 10.7503/cjcu20170388

• 物理化学 • 上一篇    下一篇

导电玻璃负载Fe2O3/ZnO复合光电极的制备及光电催化性能

韩志英, 李佑稷(), 林晓, 汪子钰, 李紫琴, 王昊   

  1. 吉首大学化学化工学院, 吉首 416000
  • 收稿日期:2017-06-19 出版日期:2018-04-10 发布日期:2018-03-21
  • 作者简介:联系人简介: 李佑稷, 男, 博士, 教授, 主要从事纳米材料合成与应用研究. E-mail:bcclyj@163.com
  • 基金资助:
    国家自然科学基金(批准号: 21476095)、 湖南省高校科技创新团队支持计划和湖南省高校科技创新团队资助

Preparation and Photoelectrocatalytic Performance of Fe2O3/ZnO Composite Electrode Loading on Conductive Glass

HAN Zhiying, LI Youji*(), LIN Xiao, WANG Ziyu, LI Ziqin, WANG Hao   

  1. Department of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China
  • Received:2017-06-19 Online:2018-04-10 Published:2018-03-21
  • Contact: LI Youji E-mail:bcclyj@163.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21476095), the Program for Science and Technology Innovative Research Team in Higher Educational Institution of Hunan Province, China and the Technology Innovative Research Team in Higher Educational Institution of Hunan Province, China

摘要:

以聚乙烯吡咯烷酮(PVP)为纤维骨架, 乙醇为溶剂, 乙酸锌[Zn(CH3COO)2·2H2O]和三乙酰丙酮铁(C15H21O6Fe)为原料, 利用静电纺丝技术结合溶胶-凝胶法制备前驱体纤维, 经焙烧后得到不同摩尔比的FTO导电玻璃负载Fe2O3/ZnO复合光电极(Fe2O3/ZnO/FTO). 利用热重-差热分析仪(TG-DTA)、 X射线衍射仪(XRD)、 扫描电子显微镜(SEM)和X射线光电子能谱仪(XPS)等对材料进行了表征, 以亚甲基蓝(MB)为目标降解物, 探讨了复合材料的光电催化活性. 结果表明, Fe2O3与ZnO的复合能够有效构建p-n异质结, 利于光生电子和空穴的分离, 其光电催化性能较纯ZnO/FTO和Fe2O3/FTO均有明显提高; 不同n(Fe)/n(Zn)的复合光电极表现出了不同的光电催化活性, 在相同催化时间内, 当n(Fe)/n(Zn)=1:1时, Fe2O3/ZnO/FTO对MB催化活性最佳, MB的降解率达到97%.

关键词: 静电纺丝, Fe2O3/ZnO/FTO, 复合光电极, 光电催化

Abstract:

Using polyvinylpyrrolidone(PVP) and ethanol as fiber skeleton and solvent, respectively, Fe2O3/ZnO precursor fibers were prepared by sol-gel method combined with electrospinning technique with zinc acetate [Zn(CH3COO)2·2H2O] and three iron acetylacetonate(C15H21O6Fe) as raw materials. Fe2O3/ZnO/FTO composite photoelectrodes with different Fe/Zn molar ratios were obtained by calcination. The morphologies and chemical components were characterized by thermogravimetry-differential thermal analysis(TG-DTA), X-ray diffraction(XRD), scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), and so on. The photoelectrocatalytic performance of the obtained sample was tested by the degradation of methylene blue(MB) solution. The results indicate that the p-n heterojunctions between ZnO and Fe2O3 are beneficial for separation of photogenerated electrons and holes, resulting in Fe2O3/ZnO/FTO with high catalytic activity in comparsion with ZnO/FTO and Fe2O3/FTO. The composite photoelectrodes with different Fe/Zn molar ratios exhibit different photoelectrocatalytic activity. When n(Fe)/n(Zn) is 1:1, the catalytic activity of Fe2O3/ZnO/FTO is the optimal, the degradation rate of MB is 97% after 140 min.

Key words: Electrospinning, Fe2O3/ZnO/FTO, Composite photoelectrode, Photoelectrocatalysis