Preparation of metal sulfide mixtures in montmorillonite by solid-solid reactions

Jirabhorn Kabilaphat, Nithima Khaorapapong, Kanji Saito, Makoto Ogawa

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Novel hybrids composed of mixed metal sulfides (manganese sulfide and zinc sulfide (MnS/ZnS) or cadmium sulfide (MnS/CdS), as well as zinc sulfide and cadmium sulfide (ZnS/CdS)) with montmorillonite were synthesized by solid-solid reactions between the ion exchanged montmorillonite and sodium sulfide. The products were characterized by powder X-ray diffraction, transmission electron microscopy, as well as Raman, UV-visible and photoluminescence spectroscopies. The Raman spectra indicated the presence of manganese sulfide, zinc sulfide, and/or cadmium sulfide in the products. The absorption onsets observed at 318-366. nm for MnS/ZnS@montmorillonite, at 330-521. nm for MnS/CdS@montmorillonite, and at 360-480. nm for ZnS/CdS@montmorillonite indicated the formation of two metal sulfides in the interlayer spaces. In comparison with those of bulk MnS (340. nm), ZnS (360. nm) and CdS (525. nm), the absorption onsets owing to both metal sulfides were blue shifted probably due to quantum confinement effect, suggesting that the products are composed of nanometer sized sulfide particles. The photoluminescence bands owing to manganese sulfide (416 and 435. nm), zinc sulfide (413 and 440. nm), and cadmium sulfide (451 and 469. nm) were also seen. The emission intensity of MnS/ZnS@montmorillonite was stronger than that of MnS/CdS@montmorillonite, probably due to the higher band gap energy of MnS/ZnS system that resulted in the increase of recombination of excitons.

    Original languageEnglish
    Pages (from-to)248-253
    Number of pages6
    JournalApplied Clay Science
    Volume115
    DOIs
    Publication statusPublished - 2015 Oct 1

    Fingerprint

    Bentonite
    Sulfides
    montmorillonite
    Metals
    sulfide
    metal
    zinc
    cadmium
    manganese
    Quantum confinement
    Photoluminescence spectroscopy
    zinc sulfide
    cadmium sulfide
    X ray powder diffraction
    manganese sulfide
    Raman scattering
    Photoluminescence
    Energy gap
    Ions
    Transmission electron microscopy

    Keywords

    • Cadmium
    • Manganese
    • Montmorillonite
    • Solid-solid reaction
    • Sulfide
    • Zinc

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Geology

    Cite this

    Preparation of metal sulfide mixtures in montmorillonite by solid-solid reactions. / Kabilaphat, Jirabhorn; Khaorapapong, Nithima; Saito, Kanji; Ogawa, Makoto.

    In: Applied Clay Science, Vol. 115, 01.10.2015, p. 248-253.

    Research output: Contribution to journalArticle

    Kabilaphat, Jirabhorn ; Khaorapapong, Nithima ; Saito, Kanji ; Ogawa, Makoto. / Preparation of metal sulfide mixtures in montmorillonite by solid-solid reactions. In: Applied Clay Science. 2015 ; Vol. 115. pp. 248-253.
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    AB - Novel hybrids composed of mixed metal sulfides (manganese sulfide and zinc sulfide (MnS/ZnS) or cadmium sulfide (MnS/CdS), as well as zinc sulfide and cadmium sulfide (ZnS/CdS)) with montmorillonite were synthesized by solid-solid reactions between the ion exchanged montmorillonite and sodium sulfide. The products were characterized by powder X-ray diffraction, transmission electron microscopy, as well as Raman, UV-visible and photoluminescence spectroscopies. The Raman spectra indicated the presence of manganese sulfide, zinc sulfide, and/or cadmium sulfide in the products. The absorption onsets observed at 318-366. nm for MnS/ZnS@montmorillonite, at 330-521. nm for MnS/CdS@montmorillonite, and at 360-480. nm for ZnS/CdS@montmorillonite indicated the formation of two metal sulfides in the interlayer spaces. In comparison with those of bulk MnS (340. nm), ZnS (360. nm) and CdS (525. nm), the absorption onsets owing to both metal sulfides were blue shifted probably due to quantum confinement effect, suggesting that the products are composed of nanometer sized sulfide particles. The photoluminescence bands owing to manganese sulfide (416 and 435. nm), zinc sulfide (413 and 440. nm), and cadmium sulfide (451 and 469. nm) were also seen. The emission intensity of MnS/ZnS@montmorillonite was stronger than that of MnS/CdS@montmorillonite, probably due to the higher band gap energy of MnS/ZnS system that resulted in the increase of recombination of excitons.

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