Cross-Linked Smectites. III. Synthesis and Properties of Hydroxy-Aluminum Hectorites and Fluorhectorites
書誌事項
- 公開日
- 1984-04
- 権利情報
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- https://www.cambridge.org/core/terms
- DOI
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- 10.1346/ccmn.1984.0320203
- 公開者
- Cambridge University Press (CUP)
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説明
<jats:title>Abstract</jats:title><jats:p>Interaction of La<jats:sup>3+</jats:sup>- and Ce<jats:sup>3+</jats:sup>-exchanged hectorites with oligomeric hydroxy-Al cations results in the formation of cross-linked hectorites possessing moderately high surface areas (~ 220–280 m<jats:sup>2</jats:sup>/g) and high thermal stability. The basal spacings of these products were generally in the range 17.0–18.0 A, the exact d(001) value depending on the age of the hydroxy-Al oligomeric solution and on the pH of the starting hectorite dispersion. Interaction of Li- or Ce-fluorhectorite with hydroxy-Al oligocations produced the corresponding cross-linked fluorhectorites, which showed markedly higher basal spacings (18.2–20.0 Å for air-dried samples), surface areas (~300–380 m<jats:sup>2</jats:sup>/g), and thermal stability, as compared with those of the cross-linked hectorites. The cross-linking agent applied in the synthesis of the hydroxy-Al hectorite and fluorhectorite products consisted of a solution of hydroxy-Al oligomers aged for periods of 7 to 27 days. A constant ratio of 2.0 mmole Al/g of smectite was used in all preparations. The high basal spacings and porosity of the newly synthesized products are consistent with a structure similar to that previously proposed for cross-linked hydroxy-Al montmorillonite.</jats:p>
収録刊行物
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- Clays and Clay Minerals
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Clays and Clay Minerals 32 (2), 99-107, 1984-04
Cambridge University Press (CUP)
