Dramatic promotion of visible-light photoreactivity of TiO2 hollow microspheres towards NO oxidation by introduction of oxygen vacancy

Abstract
Hollow-structured TiO2 has attracted much attention owing to its low density, good light-reflecting ability, and excellent permeability. However, the wide bandgap (about 3.2 eV for anatase TiO2) and fast recombination of photo-generated carriers hamper its practical application. Herein, oxygen vacancy (OV) was introduced onto the surface of TiO2 hollow microspheres (TiO2-HMSs) by a facile method through calcination of the mixture of hydrogen titanate hollow microspheres (H2TiO3-HMSs) and urea. Using this strategy, both the aims of extending the light-response range and promoting the separation of photo-generated carriers were satisfactorily achieved. The introduction of Ov facilitates the adsorption and activation of NO and O2 on the surface of TiO2-HMSs. This stimulates the production of reactive oxygen species, such as superoxide radicals ([rad]O2 −) and hydroxyl radicals ([rad]OH), resulting in the dramatic promotion of visible-light photocatalytic oxidation of NO.

Citation
Hu, Z., Li, K., Wu, X., Wang, N., Li, X., Li, Q., … Lv, K. (2019). Dramatic promotion of visible-light photoreactivity of TiO2 hollow microspheres towards NO oxidation by introduction of oxygen vacancy. Applied Catalysis B: Environmental, 256, 117860. doi:10.1016/j.apcatb.2019.117860

Acknowledgements
This work was supported by the National Natural Science Foundation of China (51672312 & 21373275) and the Fundamental Research Funds for the Central Universities, South-Central University for Nationalities (CZT19006).

Publisher
Elsevier BV

Journal
Applied Catalysis B: Environmental

DOI
10.1016/j.apcatb.2019.117860

Additional Links
https://linkinghub.elsevier.com/retrieve/pii/S092633731930606X

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