TY - JOUR
T1 - Dramatic promotion of visible-light photoreactivity of TiO2 hollow microspheres towards NO oxidation by introduction of oxygen vacancy
AU - Hu, Zhao
AU - Li, Kaining
AU - Wu, Xiaofeng
AU - Wang, Ning
AU - Li, Xiaofang
AU - Li, Qin
AU - Li, Lin
AU - Lv, Kangle
N1 - KAUST Repository Item: Exported on 2020-10-01
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).
PY - 2019/6/15
Y1 - 2019/6/15
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/656272
UR - https://linkinghub.elsevier.com/retrieve/pii/S092633731930606X
UR - http://www.scopus.com/inward/record.url?scp=85067583648&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2019.117860
DO - 10.1016/j.apcatb.2019.117860
M3 - Article
SN - 0926-3373
VL - 256
SP - 117860
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -