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An in-situ solid-state heredity-restriction strategy to introduce oxygen defects into TiO2 with enhanced photocatalytic performance

Abstract

Oxygen vacancies are widely investigated as a vital factor in semiconductor photocatalysts. The formation of oxygen vacancies mainly depended on reduction method with complicated process and environmental pollution. Herein, a precursor with deficient oxygen atoms was selected and the amount of the reacted oxygen was limited to form the defected target product, which is an novel and environment-friendly solid-state strategy to in situ create oxygen vacancies on the surface or into bulk lattice of TiO2 without using any reducing gases and reductive reagents in this study. Specifically, the precursor of NH4TiOF3 containing only one oxygen atom was designed and synthesized, then, the amount of oxygen atoms was controlled to react with the Ti atoms in the as-created precursor. Finally, both the internal and exterior oxygen vacancies were simultaneously introduced into TiO2. The obtained photocatalyst BNC has better photocatalytic performance for degradation than the ones of the photocatalyst BN5-NH obtained by traditional means of reduction. The photocatalytic degradation rate of BNC for model organic contaminants was up to 95% after 12 min illumination. The photocatalytic performance was not weakened prominently after 15 months. This work provides a new and environment-friendly method to create the surface or bulk oxygen vacancies for semiconductor materials, which maybe paves a new way to design and synthesize diverse defective materials for various applications.

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Publication details

The article was received on 30 Jul 2018, accepted on 11 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8CE01267A
Citation: CrystEngComm, 2018, Accepted Manuscript
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    An in-situ solid-state heredity-restriction strategy to introduce oxygen defects into TiO2 with enhanced photocatalytic performance

    J. Hu, W. Jia, J. Xie, Y. Cao, X. Zhang and D. Jia, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01267A

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