Differences of characteristics and performance with Bi3+ and Bi2O3 doping over TiO2 for photocatalytic oxidation under visible light

Huang, Q., Ye, J., Si, H., Yang, B., Tao, T., Zhao, Y., Chen, M. and Yang, H. ORCID: https://orcid.org/0000-0001-9940-8273 (2020) Differences of characteristics and performance with Bi3+ and Bi2O3 doping over TiO2 for photocatalytic oxidation under visible light. Catalysis Letters. pp. 1-13. ISSN 1011-372X doi: 10.1007/s10562-019-03017-w

Abstract/Summary

Bi-doped TiO2 photocatalysts were synthesized by sol with a high-pressure hydrothermal method and developed for the photocatalytic degradation of formaldehyde under the visible light irradiation and ambient temperature. According to characterization, it could be found that some Bi-doped TiO2 could be transformed into the distinctive crystals phase of Bi4Ti3O12, which was crucial for improving activity. The excess Bi2O3 doping into TiO2, such as Bi2O3-N/TiO2 and Bi2O3-C/TiO2, generated a mixed oxides with Bi2O3 and Bi4Ti3O12, was not beneficial to increase the activity of HCHO oxidation, whereas Bi3+/TiO2 composed of TiO2 and Bi4Ti3O12 displayed a higher activity with good stability. It was worth noteworthy that Bi3+/TiO2 didn’t show the lowest binding energy. However, it exhibited a lower PL intensity, higher adsorption, and activity due to the uniform particulates, high surface areas, and the strong interaction between TiO2 and Bi4Ti3O12, attributing to create superoxide radical anion (•O2-) and hydroxyl radical (•OH). The present results of Bi3+/TiO2 indicated that HCHO could be effectively oxidized from 1.094 to 0.058 mg/m3 (94.7%) under visible light irradiation within 36 h. The current research made effort to draw out the existing state of Bi, which would be better, Bi3+ or Bi2O3, doped in the TiO2.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/87158
Identification Number/DOI	10.1007/s10562-019-03017-w
Refereed	Yes
Divisions	Science > School of Archaeology, Geography and Environmental Science > Department of Geography and Environmental Science
Publisher	Springer
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