Synthesis and characterization of Fe3O4/ZnO-GO nanocomposites with improved photocatalytic degradation methyl orange under visible light irradiation

JOURNAL OF ALLOYS AND COMPOUNDS

卷:737

Article

Feng, Qi^1,2  Li, Shaoyuan^1,2  Ma, Wenhui^1,2  Fan, Hua-Jun³  Wan, Xiaohan²  Lei, Yun^1,2  Chen, Zhengjie²  Yang, Jia²  Qin, Bo² 

[1] Kunming Univ Sci & Technol, State Key Lab Complex Nonferrous Met Resources Cl, Kunming 650093, Yunnan, Peoples R China

[2] Kunming Univ Sci & Technol, Inst New Energy, Silicon Met & Silicon Mat Engn Res Ctr Univ Yunna, Kunming 650093, Yunnan, Peoples R China

[3] Prairie View A&M Univ, Dept Chem, Prairie View, TX 77446 USA

关键词: Ternary nanohybrid compounds;    Magnetical photocatalyst;    Graphene oxide sheets;    Methyl orange degradation;   

DOI  :  10.1016/j.jallcom.2017.12.070

来源: Elsevier

【 摘 要 】

To improve the photocatalytic property and recovery rate of existing ZnO materials, a magnetically separable heterostructure photocatalytic composed of GO sheets and nanohybrid Fe3O4/ZnO material was synthesized by a simple low-temperature chemical synthesis process. This synthesis enables simultaneous decoration of Fe3O4/ZnO spheres on both sides of the GO sheets. As a result, the Tauc's plot revealed the band gap of Fe3O4/ZnO-GO sample decreases to 2.07 eV from 3.38 eV of ZnO. This smaller energy band gap and slower recombination rate of electron-hole pairs greatly improve the photocatalytic activity of the Fe3O4/ZnO-GO complex through the wider visible light absorption range. The photocatalytic reaction rate of the pure ZnO photocatalyst is 4.84 x 10(-3) min(-1), for Fe3O4/ZnO composite is 1.564 x 10(-2) min(-1) and for Fe3O4/ZnO-GO composite is 5.558 x 10(-2) min(-1). The stability and recovery rate and photocatalytic property retention also greatly improved from ZnO-only photocatalyst. The photocatalytic reactivity of Fe3O4/ZnO-GO nanocomposite structure reaches 92.8% efficiency on the first run and was at 75% efficiency after the four cycling. (C) 2017 Elsevier B.V. All rights reserved.

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