Synthesis of cadmium sulfide pillared layered compounds and photocatalytic reduction of nitrate under visible light irradiation

Sittinun Tawkaew, Yoshinobu Fujishiro, Sku Yin, Tsugio Sato

    Research output: Contribution to journalArticlepeer-review

    63 Citations (Scopus)

    Abstract

    Layered compound/CdS nanocomposites incorporating CdS pillars in the interlayer of layered compounds such as hectorite, H2Ti4O9 and H4Nb6O17 were prepared by the stepwise ion exchange reactions of the layered compounds with C3H7NH3+ and Cd2+ followed by the reaction with H2S gas. The pillar height was less than 1 nm and the band gap energy was slightly larger than that of normal crystalline CdS. Although the host layered compounds were insulators or wide band gap semiconductors, CdS pillared layered compounds showed photocatalytic activity under visible light irradiation. Nitrate ion was photochemically reduced to nitrite, nitrogen and ammonia by irradiating visible light (λ>400 m) from a high pressure mercury lamp to nitrate solution containing H2Ti4O9/CdS and H4Nb6O17/CdS nanocomposites in the presence of a sacrificial hole acceptor such as methanol, whereas no photoreduction of nitrate proceeded in the presence of unsupported CdS and hectorite/CdS nanocomposite, indicating that the incorporation of CdS pillars in the interlayer of a semiconducting layered compound such as H2Ti4O9 and H4Nb6O17 was much more efficient in enhancing the nitrate reduction activity than when an insulator such as hectorite was used.

    Original languageEnglish
    Pages (from-to)139-144
    Number of pages6
    JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
    Volume179
    Issue number2-3
    DOIs
    Publication statusPublished - 2001 Mar 30

    Keywords

    • CdS
    • Intercalation
    • Layered compound
    • Nanocomposite
    • Photoreduction of nitrate

    ASJC Scopus subject areas

    • Surfaces and Interfaces
    • Physical and Theoretical Chemistry
    • Colloid and Surface Chemistry

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