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Mesoporous silica-based carbon dot–carbon nitride composite for efficient photocatalysis

Yulan Peng,Fenghui Liu,Lingzhi Wang,Yongdi Liu,J. Lei,Jinlong Zhang

Published 2017 in RSC Advances

ABSTRACT

In this work, graphene carbon nitride (g-C3N4, CN) is loaded into the carbon dots (CD) modified SBA-15 mesoporous silica by a precursor impregnation method. The obtained samples are characterized by various spectroscopy techniques and applied in the visible-light-driven photocatalytic degradation of phenol. The photocatalytic activity of the obtained SBA15–CN is 2 times as high as that of pure g-C3N4 due to the high dispersion of g-C3N4 into SBA-15 channels. For CD-SBA15–CN, the visible light driven photocatalytic activity is further increased, which is 4 times as high as that of pure g-C3N4. This promotion can be attributed to carbon dots with the ability to transfer photogenerated electrons as well as the compound catalyst having a bigger surface area and pore volume. When the weight ratio of CD-SBA15/g-C3N4 was 1 : 6, the catalyst (1 : 6 CD-SBA15–CN) performed best. The 1 : 6 CD-SBA15–CN photocatalyst had enhanced visible absorption and the interaction between CDs and g-C3N4 can further promote the separation of photo-generated electrons and holes, achieving the highest photocatalytic activity of CD-SBA15–CN compared to SBA15–CN and g-C3N4.

PUBLICATION RECORD

  • Publication year

    2017

  • Venue

    RSC Advances

  • Publication date

    2017-11-10

  • Fields of study

    Materials Science, Chemistry, Environmental Science

  • Identifiers
    DOI 10.1039/C7RA08969D
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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