4.7 Article

Reductant-free synthesis of oxygen vacancies-mediated TiO2 nanocrystals with enhanced photocatalytic NO removal performance: An experimental and DFT study

期刊

APPLIED SURFACE SCIENCE
卷 544, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.apsusc.2020.148923

关键词

TiO2; Oxygen vacancies; Reductant-free; DFT; Photocatalytic NO removal

资金

  1. science Foundation for HighLevel Talents of Wuyi University [2019TP007]
  2. China Scholarship Council [201706240247]

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In this study, a reductant-free strategy was developed to fabricate oxygen vacancies-mediated TiO2 nanocrystals. The organic carbon-doping was found to be conducive to the formation of oxygen vacancies, and the resulting nanocrystals showed outstanding photocatalytic performance.
Herein, we developed a reductant-free strategy to fabricate oxygen vacancies-mediated (OVs-mediated) TiO2 nanocrystals. Different from the conventional reduction process, OVs-mediated TiO2 were synthesized via a low-temperature calcination in nitrogen atmosphere assisted solvothermal process. Firstly, the pristine TiO2 was synthesized by solvothermal process using the tetra-n-butyl titanate as precursor and ethanol as solvent. Because of the organic precursor and solvent, the obtained pristine TiO2 was inevitably carbon-doped. Then, low-temperature calcination in nitrogen atmosphere instead of reducing gas atmosphere was carried out to introduce the OVs into the pristine TiO2. Experimental and theoretical results revealed that the intrinsic carbon-doping was conducive to the formation of OVs. Moreover, the obtained OVs-mediated TiO2 exhibited outstanding photocatalytic performance in comparison with the commercial P25, which was attributed to the crucial roles of OVs. This work not only provided a novel synthesis of OVs-mediated TiO2, but also contributed to understanding the crucial roles of OVs.

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