Model calculation of sepiolite surface areas

Toshiyuki Hibino, Atsumu Tsunashima, Atsushi Yamazaki, Ryohei Otsuka

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    37 Citations (Scopus)

    Abstract

    In general, the N2-BET surface areas of sepiolite samples range from 95 to 400 m2/g depending on deposits. The surface areas of five sepiolites, all varying in crystallite size, were measured on heating, and were compared with a model calculation. A sharp decrease in the surface area, due to crystal folding, was observed between 200° and 400°C. Both before and after the folding, each sepiolite sample had peculiar values. Our model sufficiently explains this difference in surface areas among the samples. In the model, which is based on the Brauner-Preisinger structural model, surface area is a function of the crystallite size and the ratios of the coverage for nitrogen adsorption on both the internal and external surfaces. These ratios of the coverage can be inversely estimated from the model. The ratios of the coverage on the internal surface are less than 0.19, and that on the external surface between 0.7 and 1.0

    Original languageEnglish
    Pages (from-to)391-396
    Number of pages6
    JournalClays and Clay Minerals
    Volume43
    Issue number4
    DOIs
    Publication statusPublished - 1995

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    Keywords

    • Heat treatment
    • Model calculation
    • Sepiolite
    • Surface area

    ASJC Scopus subject areas

    • Soil Science
    • Earth and Planetary Sciences (miscellaneous)
    • Geochemistry and Petrology
    • Water Science and Technology

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