SYNTHESIS OF LARGE-SWELLING Na-TYPE BENTONITE BY HYDROTHERMAL ION EXCHANGE

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<p>Herein we synthesized Na-type bentonite by hydrothermal ion exchange from Ca-type bentonite. Ca2+ ions in the montmorillonite layer in bentonite were exchanged for H+ or Na+ ions by hydrothermal treatment using ion-exchanged water or NaCl aqueous solution, respectively. The swelling index of the resulting Na-type bentonite, treated with the NaCl aqueous solution, was in the range from 11.2 to 15.0 mL/2 g, close to that of Na-activated bentonite. Likewise, using aqueous Na2CO3 solution, Ca2+ ions in the montmorillonite layer in bentonite were exchanged for Na+ ions by hydrothermal treatment. The swelling index of the sample treated with aqueous Na2CO3 solution was in the range from 18.2 to 25.3 mL/2 g, as large as that in natural Na-type bentonite.</p>

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詳細情報 詳細情報について

  • CRID
    1390565134825478016
  • NII論文ID
    130007794567
  • DOI
    10.11362/jcssjclayscience.23.3_47
  • ISSN
    21863555
    00098574
  • 本文言語コード
    en
  • データソース種別
    • JaLC
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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