Improved photocatalytic activity of Z-scheme β-Bi2O3/Bi2WO6 nanocomposites from band bending of p-n heterojunction

Photocatalytic β-Bi 2 O 3 /Bi 2 WO 6 p-n heterojunctions were synthesized by two-step solvothermal method, and then, the phase structure, microstructures, and band structures were characterized with XRD, EDS, N 2 adsorption-desorption isotherms, and UV-vis spectroscopy. The β-Bi 2 O 3 nanoparticles...

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Bibliographic Details
Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2020-05, Vol.22 (5), Article 123
Main Authors: Li, C. X., Song, S. Y., Shi, D. S., Ying, Y., Zhang, X. X., Wei, J. Q., Hong, B., Xu, J. C., Jin, H. X., Wang, P. F., Wang, X. Q.
Format: Article
Language:English
Subjects:
Antibiotics
Bending
Bismuth compounds
Bismuth oxides
Bismuth trioxide
Catalytic activity
Characterization and Evaluation of Materials
Chemistry and Materials Science
Ciprofloxacin
Energy transition
Heterojunctions
Inorganic Chemistry
Irradiation
Lasers
Light irradiation
Materials Science
Nanocomposites
Nanoparticles
Nanotechnology
Optical Devices
Optics
P-n junctions
Photocatalysis
Photocatalysts
Photonics
Physical Chemistry
Research Paper
Solid phases
Spectroscopy
Tungstates
Ultraviolet spectroscopy
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Summary:Photocatalytic β-Bi 2 O 3 /Bi 2 WO 6 p-n heterojunctions were synthesized by two-step solvothermal method, and then, the phase structure, microstructures, and band structures were characterized with XRD, EDS, N 2 adsorption-desorption isotherms, and UV-vis spectroscopy. The β-Bi 2 O 3 nanoparticles with the smaller diameter anchor on the surface of Bi 2 WO 6 nanoparticles to form β-Bi 2 O 3 /Bi 2 WO 6 nanocomposites, resulting in the band bending for the balance of Fermi level. The band bending of p-n heterojunctions leads to the Z-scheme β-Bi 2 O 3 /Bi 2 WO 6 photocatalysts and electron narrow energy transition between E c of Bi 2 WO 6 and E v of β-Bi 2 O 3 . The accumulation of electrons at E C of β-Bi 2 O 3 and holes at E V of Bi 2 WO 6 both improve the photocatalytic activity of β-Bi 2 O 3 /Bi 2 WO 6 nanocomposites. The photocatalytic removal of ciprofloxacin increases up to about 93% for S-20 with the increasing β-Bi 2 O 3 content under visible light irradiation. Therefore, the β-Bi 2 O 3 /Bi 2 WO 6 photocatalysts with the dominant radical of •O 2 − and holes could be regarded as one of promising candidates in the fields of dealing with antibiotics. Graphical abstract
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-020-04873-z