Biomass-Assisted Synthesis of CeO2 Nanorods for CO2 Photoreduction under Visible Light

  • Zhi Liu*
    Zhi Liu
    Department of Chemistry, College of Science, Shantou University, Shantou, Guangdong 515063, P. R. China
    Department of Chemistry and Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou, Guangdong 515063, P. R. China
    *Email: [email protected]. Phone: +86 754 85603791. Fax: +86 754 82902767.
    More by Zhi Liu
  • Jia Zheng
    Jia Zheng
    Department of Chemistry, College of Science, Shantou University, Shantou, Guangdong 515063, P. R. China
    More by Jia Zheng
  • Lianfeng Duan
    Lianfeng Duan
    Department of Chemistry, College of Science, Shantou University, Shantou, Guangdong 515063, P. R. China
  • , and 
  • Zhi Zhu
    Zhi Zhu
    Institute of the Green Chemistry and Chemical Technology, Institute for Advanced Materials, Jiangsu University, Zhen Jiang 212000, P. R. China
    More by Zhi Zhu
Cite this: ACS Appl. Nano Mater. 2021, 4, 4, 4226–4237
Publication Date (Web):March 28, 2021
Copyright © 2021 American Chemical Society
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CO2 photoreduction into high-valued fuels is considered as a promising route to alleviate the clash between the environment and energy. Morphology-dependent CeO2 nanocrystallines with special crystal planes and increased amounts of specific surface areas, structural defects, and active sites have recently demonstrated excellent performance in catalysis. In this article, a biomass-assisted synthesis of CeO2 (BC) photocatalyst is successfully synthesized via a simple yet effective hydrothermal-calcining method by using commercial Ce(NO3)3 as a precursor and leaves of Alternanthera philoxeroides (LAP) as a crystal growth modifier. The amount of LAP introduced into the precursor has a significant effect on regulating the growth of the formed CeO2 from nanocubes to nanorods for the resulting BCs. Owing to the emergence of the just right microenvironment for regulating the growth of the CeO2 nanocrystalline, the optimal sample of BC-15 with a morphology of nanorods is found to be the most efficient one as a photocatalyst for CO2 reduction under visible light. As the major product, the CO yield (126.8 μmol g–1 at a reaction time of 6 h) of BC-15 is ∼7.4-fold of the reference CeO2 nanocubes synthesized without LAP in the precursor. In addition, the underlying evolution process of the nanorods and detailed mechanism insight into the boosted CO2 photoreduction performance are investigated by means of a series of experimental characterizations and results. The present work provides a meaningful protocol to utilize the crystal phase engineering strategy to design morphology dependence of photocatalysts and assisted synthesis with renewable biomass materials for solar-to-fuel conversion.

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  • SEM image, XPS VB spectrum, recycling activity tests of BC-15, PL spectra of RC and BC-15, TEM image and XRD pattern of the used BC-15, isotope analysis of 13CO using 13CO2 as a carbon source by gas chromatography–mass spectrometry for BC-15, and comparison of reaction conditions and CO2 reduction activity of BC-15 with those of other CeO2-based photocatalysts at a reaction time of 1 h (PDF)

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