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

Zhao Hu, Kaining Li, Xiaofeng Wu, Ning Wang, Xiaofang Li, Qin Li, Lin Li, Kangle Lv

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169 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)117860
JournalApplied Catalysis B: Environmental
Volume256
DOIs
StatePublished - Jun 15 2019

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