Abstract
In this study, we prepared nanoparticles of the visible light-responsive photocatalyst, Bi2O3 entrapped in anatase TiO2 nanotubes (Bi2O3-in-TNTs) via a vacuum-assisted precursor-filling process followed by annealing. Owing to the unique tubular electronic structure of TiO2 nanotubes, the interior of the nanotube is in an electron-deficient state, which was confirmed by XPS spectra and H2-TPR. Electrochemical impedance studies showed that the Bi2O3-in-TNTs demonstrated a more efficient separation of photogenerated carriers than when Bi2O3 nanoparticles were deposited on the outer wall of TiO2 nanotubes (Bi2O3-out-TNTs). Due to the confinement effect of TiO2 nanotubes, which inhibits photogenerated carriers’ recombination, the Bi2O3-in-TNTs exhibited a better photocatalytic performance for the photo-degradation of methyl orange under visible light compared to Bi2O3-out-TNTs.
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Acknowledgements
This study was funded by Science and Technology Program of Guangzhou, China (No. 201803030019) and the Natural Science Foundation of Guangdong Province (No. 2015A030313715). G.P. thanks the partial support of Natural Science Foundation of Jiangxi Province (20171BAB213010). The authors thanks for the support from the Analytical & Testing Center, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, China. The authors declare that there is no conflict.
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Peng, Q., Peng, G., Wu, L. et al. Entrapment of Bi2O3 nanoparticles in TiO2 nanotubes for visible light-driven photocatalysis. Res Chem Intermed 44, 6753–6763 (2018). https://doi.org/10.1007/s11164-018-3520-z
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DOI: https://doi.org/10.1007/s11164-018-3520-z