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Fabrication of La-Doped Bi2O3 Nanoparticles with Oxygen Vacancies for Improving Photocatalytic Activity

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La-doped Bi2O3 were prepared via a simple sol–gel method following a facile low temperature calcination process, and citric acid as an organic complexing agent. La3+ doping could not only create oxygen vacanices (OVs) on the surface of Bi2O3, but also as the efficient scavenger to capture photogenerated electrons. The novel x% La–Bi2O3 photocatalysts exhibited oxidation capacities for degrading azo dye methyl orange (MO) and colorless pollutant phenol, and 2% La–Bi2O3 sample showed the highest photocatalytic activity. The enhanced photocatalytic activity in MO and phenol photo-degradation were attributed to the strong synergistic effects of La3+-doping and oxygen vacancies (OVs), which La3+ ions capture, transfer, and release the photo-generated electrons for conversion from O2 to \( ^{ \cdot } O_{2}^{ - } \) to prevent the hot e of CB to jump into the level of OVs, thereby increase separation efficiencies of photo-generated electrons and holes. The present study may present a new perspective for the utilization of rare earth ion doping to improve the performance of other photocatalytic materials.

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This work was financially supported by the National Natural Science Foundation of China (Grant No. 11604222), and the Liaoning Provincial Natural Science Foundation of China (Grant No. 201601155).

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Correspondence to Shanyu Quan.

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Li, T., Quan, S., Shi, X. et al. Fabrication of La-Doped Bi2O3 Nanoparticles with Oxygen Vacancies for Improving Photocatalytic Activity. Catal Lett 150, 640–651 (2020). https://doi.org/10.1007/s10562-019-02970-w

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  • Bi2O3
  • La3+ doped
  • Oxygen vacancies
  • O2-TPD
  • Photocatalytic activity