Bactericidal Inorganic lon-Exchangers with Layered Structures

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  • SATO Toshio
    Department of Environmental Eco Technology, Faculty of Life and Environmental Science, Simane University
  • SUGIYAMA Kouju
    Central Laboratory of Rengo Co. Ltd.
  • SUZUKI Takashi
    Department of Aapplied Chemistry and Biotechnology, Faculty of Engineering, Yamanashi University

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Other Title
  • 抗菌性層状構造無機イオン交換体
  • Bactericidal Inorganic Ion-Exchangers w

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Abstract

Alminium substituted tobermorite which is one of cation-exchangers of layered calcicm sillcate type was synthesized hydrothermally from CaO, SiO2, Al (NO3) 3 and NaOH under saturated steam pressure at 175?°C. The caton exchange characteristics of the tobermorite to silver (I) ion has been investigated in aqueous solution at 25?°C. Tobermorites with different silver contents were prepared and tested on their antibacterial activities for Eschericia coli, Staphylococcus aureus, and Streptoverticillium reculum. All the tobermorites tested exhibited effective bactericidal activities.<BR>Taeniolite is a kind of fluorine mica contained in clay minerals. We prepared silver-, copperand zinc-holding taeniolites with the ion-exchange method. These taeniolites which held antibacterial metal were investigated with ragard to their disinfection effects against Escherichia coli (K-12 W3110) in water. Silver-holding taeniolite showed the strongest disinfection effect followed by copper- > zinc-holding taeniolite in that order. The disinfection mechanism of silver-holding taeniolite may be attributed to the synergistic effect of eluted silver ions together with silver ions in the silver-holding taeniolite.

Journal

  • Inorganic Materials

    Inorganic Materials 3 (264), 460-464, 1996

    The Society of Inorganic Materials, Japan

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