Enhanced photocatalytic NOx decomposition of visible-light responsive F-TiO2/(N,C)-TiO2 by charge transfer between F-TiO2 and (N,C)-TiO2 through their doping levels

Shio Komatsuda, Yusuke Asakura, Junie Jhon M. Vequizo, Akira Yamakata, Shu Yin

    Research output: Contribution to journalArticlepeer-review

    42 Citations (Scopus)

    Abstract

    Composite type photocatalyst F-TiO2/(N,C)-TiO2 consisted of anatase-type TiO2 with fluorine-doping (F-TiO2) and TiO2 with nitrogen and carbon-doping ((N,C)-TiO2) was prepared by simple physical mixing to exhibit higher visible-light responsive photocatalytic nitrogen oxide (NOx) decomposition activity than those of F-TiO2 and (N,C)-TiO2. Transient absorption measurement clarified that the composite possessed longer carrier lifetime compared to that of each material (F-TiO2 or (N,C)-TiO2), resulting in higher photocatalytic activity. In the composite, photoexcited holes and electrons, which are not in impurity level but in valence and conduction band, respectively, should photocatalytically decompose NOx, judging from the redox potential of O2/O2・− and the band positions of F-TiO2 and (N,C)-TiO2. The mechanism for higher visible-light photocatalytic activity, or longer carrier lifetime can be explained by charge transfer between F-TiO2 and (N,C)-TiO2 through their impurity levels. The charge transfer should make photoexcited carries spatially separated to enhance the photocatalytic activity.

    Original languageEnglish
    Pages (from-to)358-364
    Number of pages7
    JournalApplied Catalysis B: Environmental
    Volume238
    DOIs
    Publication statusPublished - 2018 Dec 15

    Keywords

    • Charge transfer
    • Composites
    • Doping level
    • Photocatalytic deNOx
    • Transient absorption

    ASJC Scopus subject areas

    • Catalysis
    • Environmental Science(all)
    • Process Chemistry and Technology

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