書誌事項
- タイトル別名
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- Distinctive Nature of Ca and Cu Adsorption by Halloysite
- ハロイサイト ノ カルシウム オヨビ ドウ イオン キュウチャク ノ トクイセイ
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説明
We measured calcium and copper adsorptions from a 0.01 mol L-1 CaCl2 solution by three halloysite samples that were purified by size-fractionation and dithionite treatments. An allophanic clay and noncrystalline silica were used as references. The Ca and Cu adsorptions increased as pH increased and all of the added Cu was adsorbed at and above pH 6.3. The halloysite samples adsorbed significant amounts of Ca and Cu even at pHs<4, suggesting that these halloysites have surface negative charge arising from isomorphous substitution. The values of the natural logarithm of the selectivity coefficient for Ca-Cu exchange were around 5 at pHs<4 and exponentially increased to about 7 at pH6.5. The values for halloysite samples were markedly higher than the values reported for 2: 1 type layer silicates. Comparison of the adsorption percentage vs. pH curves of the halloysites and allophanic clay, and silica suggested that halloysite is superior to allophane and oxide minerals as an adsorbent in heavy metals-immobilization technology.
収録刊行物
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- 粘土科学
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粘土科学 46 (3), 169-175, 2007
一般社団法人 日本粘土学会
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詳細情報 詳細情報について
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- CRID
- 1390001204111048704
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- NII論文ID
- 110006380651
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- NII書誌ID
- AN00199972
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- ISSN
- 21863563
- 04706455
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- NDL書誌ID
- 8930801
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可
