Substantial change in phenomenon of "self-corrosion" on Ag3PO4/TiO2 compound photocatalyst

Xinlong Ma, Huihui Li, Yuhua Wang, Hao Li, Bin Liu, Shu Yin, Tsugio Sato

    Research output: Contribution to journalArticlepeer-review

    63 Citations (Scopus)

    Abstract

    The phenomenon of color-change was first observed in the simple physical mixed Ag3PO4/TiO2 compounds in dark, called "self-corrosion". The difference between self-corrosion and photo-corrosion was clarified. It is found that the chemical environment of Ag is altered in Ag3PO4/TiO2 compounds compared with that in bare Ag3PO4. Furthermore, the change in self-corrosion and its impact on photocatalytic activity were investigated. It is found that under ultraviolet (UV) light irradiation the advantage over bare Ag3PO4 is still maintained in the self-corrosion Ag3PO4/TiO2 compounds due to the similar adsorption capacity. Meanwhile, the photocatalytic activity of self-corrosion Ag3PO4/TiO2 under visible light irradiation is lower than that of fresh Ag3PO4/TiO2 due to the decrease of Ag3PO4. In addition, the identification of oxidative degradation intermediates in the solution was conducted by mass spectra (MS) for the explanation of the degradation mechanism.

    Original languageEnglish
    Pages (from-to)314-320
    Number of pages7
    JournalApplied Catalysis B: Environmental
    Volume158-159
    DOIs
    Publication statusPublished - 2014 Oct

    Keywords

    • Photocatalysis
    • Silver orthophosphate
    • Stability

    ASJC Scopus subject areas

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

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