Enhanced visible-light-driven photocatalytic activities of Bi2Fe4O9/g-C3N4 composite photocatalysts

Journal Article · Wed Aug 15 04:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.04.013· OSTI ID:22805147

Wang, Geming ^[1]; Liu, Shutong; He, Tiancheng; Liu, Xuan ^[1]; Deng, Quanrong; Mao, Yangwu; Wang, Shenggao ^[1]

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1. School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan (China)

Highlights: • The novel Bi{sub 2}Fe{sub 4}O{sub 9}/g-C{sub 3}N{sub 4} composite photocatalysts have been designed and prepared. • Combination of Bi{sub 2}Fe{sub 4}O{sub 9} and g-C{sub 3}N{sub 4} could enhance the visible-light-driven photocatalytic degradation for RhB. • The effects of Bi{sub 2}Fe{sub 4}O{sub 9}/g-C{sub 3}N{sub 4} weight ratios on photocatalytic performance in the composite have been discussed. • The Z-scheme photocatalytic mechanism was proposed and discussed in detail. - Abstract: A series of Bi{sub 2}Fe{sub 4}O{sub 9}/g-C{sub 3}N{sub 4} composite photocatalysts are prepared via a facile mixing-calcination method. The crystal structures of composites are investigated by X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR). The Field Emission Scanning Electron Microscope (FE-SEM) in combination with Energy Dispersive X-ray Spectroscopy (EDS) mapping analysis and Transmission Electron Microcopy (TEM) images illustrate the uniform distribution of constituent elements and clear interface between Bi{sub 2}Fe{sub 4}O{sub 9} and g-C{sub 3}N{sub 4} component. The visible-light-driven photocatalytic rates of Rhodamine B over Bi{sub 2}Fe{sub 4}O{sub 9}/g-C{sub 3}N{sub 4} composites increase and then decrease with the increase of g-C{sub 3}N{sub 4} content. The effects of Bi{sub 2}Fe{sub 4}O{sub 9}/g-C{sub 3}N{sub 4} weight ratios on photocatalytic performance are thoroughly discussed. Meanwhile, the active species trapping experiments and the electrochemical impedance spectra as well as the electronic energy-band structure estimation analysis demonstrate that the photocatalytic mechanism for Bi{sub 2}Fe{sub 4}O{sub 9}/g-C{sub 3}N{sub 4} composites is ascribed to the Z-scheme. In addition, the recyclability and stability experiments of the composite are also studied.

• OSTI ID: 22805147
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 104; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH COMPOUNDS
CALCINATION
CARBON NITRIDES
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
ELECTROCHEMISTRY
FERRITES
FOURIER TRANSFORM SPECTROMETERS
PHOTOCATALYSIS
RADIATION EFFECTS
RHODAMINES
SCANNING ELECTRON MICROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
VISIBLE RADIATION
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY