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Ultrathin HNb3O8 nanosheets with oxygen vacancies for enhanced photocatalytic oxidation of amine under visible light irradiation

Abstract

Ultrathin HNb3O8 nanosheets (HNb3O8 NS) with oxygen vacancies were successfully synthesized by a simple bottom-up hydrothermal process. The obtained nanosheets were uniform with a thickness of about 3.02 nm and the surface oxygen vacancies on the HNb3O8 nanosheets were confirmed by electron spin resonance spectroscopy (ESR) and X-ray photoelectron spectroscopy (XPS). As compared to urchin-like Nb2O5 nanosphere and Nb2O5 nanorods, ultrathin HNb3O8 nanosheets with oxygen vacancies showed the highest activities in the photocatalytic oxidative coupling reaction of benzylamine under visible light irradiation. The improved photocatalytic activity was attributed to the following reasons: (1) unique nanosheet structure with several molecular thicknesses that led to the effective separation of the photogenerated carriers; (2) benzylamine-HNb3O8 surface complex formed on the oxygen vacancies that reduced the bandgap of HNb3O8 NS and was profitable to harvest visible light; (3) HNb3O8 NS-V could efficiently chemisorb O2 molecules and promote to activate O2 to reactive oxygen species.

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Publication details

The article was received on 15 Dec 2018, accepted on 10 Feb 2019 and first published on 11 Feb 2019


Article type: Paper
DOI: 10.1039/C8TA12118D
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Ultrathin HNb3O8 nanosheets with oxygen vacancies for enhanced photocatalytic oxidation of amine under visible light irradiation

    J. Chen, H. Wang, Z. Zhang, L. F. han, Y. Zhang, F. Gong, K. Xie, L. Xu, W. Song and S. Wu, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA12118D

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