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g-C3N4 quantum dots-modified mesoporous CeO2 composite photocatalyst for enhanced CO2 photoreduction

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Abstract

g-C3N4 quantum dots (CN QDs)-decorated mesoporous CeO2 composite photocatalyst was prepared by hydrothermal method. The characterized results exhibit that the CN QDs are successfully coupled with mesoporous CeO2, and the photoelectronic response is effectively enhanced. The photocatalytic activity was tested by CO2 reduction, and the results showed that when the loading of CN QDs was 0.75 wt%, the composite photocatalyst has the best photocatalytic activity. After 10 h of UV irradiation, the yields of CO and CH4 were 22.48 µmol/g and 15.81 µmol/g, respectively. Some of the electrons generated within m-CeO2 participated in the CO2 reduction reaction and some were transferred to CN QDs through the two-phase interface to participate in the CO2 catalytic reaction. The oxygen vacancies in m-CeO2 can adsorb CO2 and the introduced CN QDs can excite more oxygen vacancies with m-CeO2 heterostructure, thereby adsorbing more CO2 and photoreduction electrons.

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Acknowledgements

Project supported by the financial support of the National Natural Science Foundation of China (Grant No. 21776117).

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Authors and Affiliations

  1. Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, People’s Republic of China

    Haopeng Jiang & Songtao Chen

  2. College of Municipal and Environmental Engineering, Henan University of Urban Construction, **dingshan, 467000, People’s Republic of China

    Haopeng Jiang & Songtao Chen

  3. Institute of Green Chemistry and Chemical Technology, School of Chemistry & Chemical Engineering, Jiangsu University, Zhenjiang, 212013, People’s Republic of China

    **n Li & Pengwei Huo

  4. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, People’s Republic of China

    Huiqin Wang

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  1. Haopeng Jiang
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Jiang, H., Li, X., Chen, S. et al. g-C3N4 quantum dots-modified mesoporous CeO2 composite photocatalyst for enhanced CO2 photoreduction. J Mater Sci: Mater Electron 31, 20495–20512 (2020). https://doi.org/10.1007/s10854-020-04568-0

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