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

By Zhao Hu, Kaining Li, Xiaofeng Wu, Ning Wang, Xiaofang Li, Qin Li, Lin Li, K. Lv. Applied Catalysis B: Environmental, 2019

170 citations recorded by the source corpus.

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 ( O2−) and hydroxyl radicals ( OH), resulting in the dramatic promotion of visible-light photocatalytic oxidation of NO.

Subfields: Materials Chemistry, Renewable Energy, Sustainability and the Environment

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