Citation: Yuhan Li, Kangle Lv, Wingkei Ho, Zaiwang Zhao, Yu Huang. Enhanced visible-light photo-oxidation of nitric oxide using bismuth-coupled graphitic carbon nitride composite heterostructures[J]. Chinese Journal of Catalysis, ;2017, 38(2): 321-329. doi: 10.1016/S1872-2067(16)62573-1 shu

Enhanced visible-light photo-oxidation of nitric oxide using bismuth-coupled graphitic carbon nitride composite heterostructures

Yuhan Li ^a, ,
Kangle Lv ^a,c ,
Wingkei Ho ^a,b ,
Zaiwang Zhao ^a ,
Yu Huang ^b

a Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, N. T., Hong Kong, China;
b Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, Shanxi, China;
c Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, Hubei, China

Received Date: 29 August 2016
Revised Date: 5 October 2016

Fund Project: This work was supported by the National Program on Key Basic Research Project (2016YFA0203000), the Early Career Scheme (ECS 809813) from the Research Grant Council, Hong Kong SAR Government, the Croucher Foundation Visitorship for PRC Scholars 2015/16 at The Education University of Hong Kong, the National Natural Science Foundation of China (51672312, 21373275), and the Program for New Century Excellent Talents in University (NCET-12-0668).

Pure bismuth (Bi) metal-modified graphitic carbon nitride (g-C₃N₄) composites (Bi-CN) with a pomegranate-like structure were prepared by an in situ method. The Bi-CN composites were used as photocatalysts for the oxidation of nitric oxide (NO) under visible-light irradiation. The inclusion of pure Bi metal in the g-C₃N₄ layers markedly improved the light absorption of the Bi-CN composites from the ultraviolet to the near-infrared region because of the typical surface plasmon resonance of Bi metal. The separation and transfer of photogenerated charge carriers were greatly accelerated by the presence of built-in Mott-Schottky effects at the interface between Bi metal and g-C₃N₄. As a result, the Bi-CN composite photocatalysts exhibited considerably enhanced efficiency in the photocatalytic removal of NO compared with that of Bi metal or g-C₃N₄ alone. The pomegranate-like structure of the Bi-CN composites and an explanation for their improved photocatalytic activity were proposed. This work not only provides a design for highly efficient g-C₃N₄-based photocatalysts through modification with Bi metal, but also offers new insights into the mechanistic understanding of g-C₃N₄-based photocatalysis.
- Bismuth,
- Surface plasmon resonance,
- Photo-oxidation,
- Nitric oxide,
- Visible light,
- Graphitic carbon nitride
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