Introducing oxygen vacancies in TiO<sub>2</sub> lattice through trivalent iron to enhance the photocatalytic removal of indoor NO

Peng Sun; Sumei Han; Jinhua Liu; Jingjing Zhang; Shuo Yang; Faguo Wang; Wenxiu Liu; Shu Yin; Zhanwu Ning; Wenbin Cao

doi:10.1007/s12613-023-2611-z

Volume 30 Issue 10

Oct. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(10): 2025-2035

Peng Sun, Sumei Han, Jinhua Liu, Jingjing Zhang, Shuo Yang, Faguo Wang, Wenxiu Liu, Shu Yin, Zhanwu Ning, and Wenbin Cao, Introducing oxygen vacancies in TiO₂ lattice through trivalent iron to enhance the photocatalytic removal of indoor NO, Int. J. Miner. Metall. Mater., 30(2023), No. 10, pp. 2025-2035. https://doi.org/10.1007/s12613-023-2611-z

Cite this article as:

Peng Sun, Sumei Han, Jinhua Liu, Jingjing Zhang, Shuo Yang, Faguo Wang, Wenxiu Liu, Shu Yin, Zhanwu Ning, and Wenbin Cao, Introducing oxygen vacancies in TiO2 lattice through trivalent iron to enhance the photocatalytic removal of indoor NO, Int. J. Miner. Metall. Mater., 30(2023), No. 10, pp. 2025-2035. https://doi.org/10.1007/s12613-023-2611-z

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Research Article

Introducing oxygen vacancies in TiO₂ lattice through trivalent iron to enhance the photocatalytic removal of indoor NO

+ Author Affiliations

Corresponding authors:
Shu Yin    E-mail: yin.shu.b5@tohoku.ac.jp

Zhanwu Ning    E-mail: nzwu@163.com

Wenbin Cao    E-mail: wbcao@ustb.edu.cn
Received: 28 November 2022; Revised: 2 February 2023; Accepted: 14 February 2023; Available online: 15 February 2023

Abstract

Abstract

The synthesis of oxygen vacancies (OVs)-modified TiO₂ under mild conditions is attractive. In this work, OVs were easily introduced in TiO₂ lattice during the hydrothermal doping process of trivalent iron ions. Theoretical calculations based on a novel charge-compensation structure model were employed with experimental methods to reveal the intrinsic photocatalytic mechanism of Fe-doped TiO₂ (Fe–TiO₂). The OVs formation energy in Fe–TiO₂ (1.12 eV) was only 23.6% of that in TiO₂ (4.74 eV), explaining why Fe³⁺ doping could introduce OVs in the TiO₂ lattice. The calculation results also indicated that impurity states introduced by Fe³⁺ and OVs enhanced the light absorption activity of TiO₂. Additionally, charge carrier transport was investigated through the carrier lifetime and relative mass. The carrier lifetime of Fe–TiO₂ (4.00, 4.10, and 3.34 ns for 1at%, 2at%, and 3at% doping contents, respectively) was longer than that of undoped TiO₂ (3.22 ns), indicating that Fe³⁺ and OVs could promote charge carrier separation, which can be attributed to the larger relative effective mass of electrons and holes. Herein, Fe–TiO₂ has higher photocatalytic indoor NO removal activity compared with other photocatalysts because it has strong light absorption activity and high carrier separation efficiency.
- oxygen vacancies;
- density functional theory calculations;
- iron-doped titanium dioxide;
- carrier separation;
- photocatalytic removal of indoor nitric oxide

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