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Issue 60, 2015
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Synthesis of g-C3N4/Bi2O3/TiO2 composite nanotubes: enhanced activity under visible light irradiation and improved photoelectrochemical activity

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Abstract

g-C3N4 and Bi2O3 were successfully incorporated into TiO2 nanotubes (TiO2-NT) to produce a composite nanotube material designated as g-C3N4/Bi2O3/TiO2. The photoelectrochemical (PEC) activity under visible light irradiation with respect to bleaching of methylene blue (MB) and degradation of phenol were determined. The UV-vis absorption spectrum of the composite material, g-C3N4/Bi2O3/TiO2-NT, was red-shifted toward a narrower band gap energy (Eg). The valence band (VB) of g-C3N4/Bi2O3/TiO2-NT was shifted to a more positive potential resulting in an increased driving force for water oxidation. The photocurrent generated by g-C3N4/Bi2O3/TiO2-NTs was approximately 15 times higher and the incident photon-to-current efficiency (IPCE at λ = 400 nm) was higher than that of the naked TiO2-NTs. This response is attributed to increasing the lifetimes of photo-generated electron–hole pairs. A significantly higher PEC response in terms of the bleaching of MB was observed on g-C3N4/Bi2O3/TiO2-NT. The roles of improved charge separation and subsequent higher electron-transfer efficiencies for in g-C3N4/Bi2O3/TiO2-NT electrodes were examined.

Graphical abstract: Synthesis of g-C3N4/Bi2O3/TiO2 composite nanotubes: enhanced activity under visible light irradiation and improved photoelectrochemical activity

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Supplementary files

Article information


Submitted
12 Feb 2015
Accepted
26 May 2015
First published
26 May 2015

RSC Adv., 2015,5, 48983-48991
Article type
Paper
Author version available

Synthesis of g-C3N4/Bi2O3/TiO2 composite nanotubes: enhanced activity under visible light irradiation and improved photoelectrochemical activity

Y. Zhang, J. Lu, M. R. Hoffmann, Q. Wang, Y. Cong, Q. Wang and H. Jin, RSC Adv., 2015, 5, 48983
DOI: 10.1039/C5RA02750K

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