Research Article

Surface Engineering of g-C₃N₄ by Stacked BiOBr Sheets Rich in Oxygen Vacancies for Boosting Photocatalytic Performance

Dongni Liu

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Prof. Dongyun Chen,

Prof. Dongyun Chen

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Prof. Najun Li,

Prof. Najun Li

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Prof. Qingfeng Xu,

Prof. Qingfeng Xu

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Prof. Hua Li,

Prof. Hua Li

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Prof. Jinghui He,

Prof. Jinghui He

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Prof. Jianmei Lu,

Corresponding Author

Prof. Jianmei Lu

[email protected]

orcid.org/0000-0003-2451-7154

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Dongni Liu,

Dongni Liu

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Prof. Dongyun Chen,

Prof. Dongyun Chen

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Prof. Najun Li,

Prof. Najun Li

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Prof. Qingfeng Xu,

Prof. Qingfeng Xu

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Prof. Hua Li,

Prof. Hua Li

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Prof. Jinghui He,

Prof. Jinghui He

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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Prof. Jianmei Lu,

Corresponding Author

Prof. Jianmei Lu

[email protected]

orcid.org/0000-0003-2451-7154

College of Chemistry, Chemical Engineering and Materials Science Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123 P. R. China

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First published: 26 December 2019

https://doi.org/10.1002/anie.201914949

Citations: 345

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Graphical Abstract

BiOBr nanoflowers, sheet-stacked and rich in oxygen vacancies, are prepared by a simple solvothermal process and form a heterojunction with graphitic carbon nitride. Oxygen vacancies and the heterojunction synergistically promote photocatalysis, achieving a NO degradation effect of 63 % and 96 % selectivity for carbonaceous products for CO₂ conversion.

Abstract

BiOBr containing surface oxygen vacancies (OVs) was prepared by a simple solvothermal method and combined with graphitic carbon nitride (g-C₃N₄) to construct a heterojunction for photocatalytic oxidation of nitric oxide (NO) and reduction of carbon dioxide (CO₂). The formation of the heterojunction enhanced the transfer and separation efficiency of photogenerated carriers. Furthermore, the surface OVs sufficiently exposed catalytically active sites, and enabled capture of photoexcited electrons at the surface of the catalyst. Internal recombination of photogenerated charges was also limited, which contributed to generation of more active oxygen for NO oxidation. Heterojunction and OVs worked together to form a spatial conductive network framework, which achieved 63 % NO removal, 96 % selectivity for carbonaceous products (that is, CO and CH₄). The stability of the catalyst was confirmed by cycling experiments and X-ray diffraction and transmission electron microscopy after NO removal.

Conflict of interest

The authors declare no conflict of interest.

Supporting Information

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Volume59, Issue11

March 9, 2020

Pages 4519-4524

Surface Engineering of g-C₃N₄ by Stacked BiOBr Sheets Rich in Oxygen Vacancies for Boosting Photocatalytic Performance

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Surface Engineering of g-C3N4 by Stacked BiOBr Sheets Rich in Oxygen Vacancies for Boosting Photocatalytic Performance

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Surface Engineering of g-C₃N₄ by Stacked BiOBr Sheets Rich in Oxygen Vacancies for Boosting Photocatalytic Performance