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Journal of Materials Science: Materials in Electronics
Published in: Journal of Materials Science: Materials in Electronics 11/2019

03-05-2019

Enhanced visible-light responsive photocatalytic activity of Bi25FeO40/Bi2Fe4O9 composites and mechanism investigation

Authors: Geming Wang, Da Cheng, Tiancheng He, Yiyu Hu, Quanrong Deng, Yangwu Mao, Shenggao Wang

Published in: Journal of Materials Science: Materials in Electronics | Issue 11/2019

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Abstract

Pure Bi25FeO40, Bi2Fe4O9, and different weight ratios of Bi25FeO40/Bi2Fe4O9 composite photocatalysts have been synthesized via a hydrothermal process combined with a mixing-calcination method and evaluated as visible-light responsive catalyst for the degradation of Rhodamine B (RhB). All the as-prepared samples have been characterized by a range of techniques including X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), UV–vis absorption spectra (DSR), Field Emission Scanning Electron Microscope (FE-SEM), Transmission electron microscope (TEM) and High-resolution TEM (HRTEM). The XRD, FT-IR, TEM and HRTEM results confirm that the composite only consists of Bi25FeO40 and Bi2Fe4O9. In the Bi25FeO40/Bi2Fe4O9 composites, closely contacted interfaces have been observed. Compared with the single-phase Bi25FeO40 and Bi2Fe4O9, Bi25FeO40/Bi2Fe4O9 composites exhibit enhanced visible-light responsive photocatalytic activities. The photocatalytic efficiency of optimized Bi25FeO40/Bi2Fe4O9 composite with Bi2Fe4O9 weight ratio of 30% is about 8.8 and 6.2 times higher than that of pure Bi25FeO40 and Bi2Fe4O9, respectively. On the basis of electronic energy-band structure analysis, the active species trapping experiments and the electrochemical impedance spectrum (EIS) performance, a heterojunction-type charge transfer mechanism interpreting the enhanced photocatalytic activities of the composite are proposed and discussed. In addition, the effects of different Bi25FeO40/Bi2Fe4O9 weight ratios and their geometry architecture on photocatalytic activities are also thoroughly discussed.
previous article Facile fabrication of Ag–Bi2GeO5 microflowers and the high photodegradable performance on RhB
next article A study of the structural, magnetic, hemocompatibility and electrochemical properties of BiFeO3 (BFO)/CoFe2O4− (CFO) nanocomposite

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Metadata
Title
Enhanced visible-light responsive photocatalytic activity of Bi25FeO40/Bi2Fe4O9 composites and mechanism investigation
Authors
Geming Wang
Da Cheng
Tiancheng He
Yiyu Hu
Quanrong Deng
Yangwu Mao
Shenggao Wang
Publication date
03-05-2019
Publisher
Springer US
Published in
Journal of Materials Science: Materials in Electronics / Issue 11/2019
Print ISSN: 0957-4522
Electronic ISSN: 1573-482X
DOI
https://doi.org/10.1007/s10854-019-01436-4

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