書誌事項
- タイトル別名
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- Cation-Exchange Properties of Zeolite Synthesized from Coal Fly Ash by Hydrothermal Reaction
- セキタンバイ フライアッシュ カラ スイネツ ゴウセイ シタ ゼオライト ノ ヨウイオン コウカン トクセイ
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The cation-exchange properties of monovalent (K+, NH4+ and Li +) and divalent(Ca2+, Mg2+, Cd2+, Pb2+ and Ni2+) cations has been investigated for the Na-zeolite synthesized from coal fly ash by a hydrothermal reaction. The amount of NH4+ exchanged with the Na-zeolite was compared to that with a commercial product, A-4 zeolite. The effect of cations (H +, K +, Na + and NH4+) on the removal of PO43-was studied for the solution containing phosphate ions.<BR>The cation-exchange capacity of the Na-zeolite synthesized from coal fly ash is as much as that of an A-4 zeolite. The monovalent and divalent caion exchange selectivity for Na-zeolite is shown to increase in the order of Pb2+ > Cd2+ > Ca2+ > K + > NH4+ > Ni2+ > Li+ > Mg2+. It is found that the cation-exchange selectivity is closely concerned with an electric charge and a hydration ion radius of the cation. Namely, the cation having a small hydration ionic radius might exchange much more with Na-zeolite, while the cation having a large hydration ionic radius might hardly exchange.<BR>Phosphate ions can be removed by a quantitative precipitation formation with Ca2+ released from Ca-zeolite. In phosphate solutions such as K3 PO4, Na3 PO4 and (NH4)3 PO4, Ca2+ is released by an ion-exchange reaction between a cation in the solution and Ca2+ on the zeolite, while in H3 PO4 solution Ca2+ is supplied in the aqueous solution from the zeolite surface destroyed by the action of an acid. It is possible to remove simultaneously NH4+ and PO43- in (NH4)3 PO4 solution through an ion-exchange reaction of NH4+ with Ca-zeolite and a precipitation reaction of PO43-with Ca2+ released from Ca-zeolite.
収録刊行物
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- 資源と素材
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資源と素材 117 (6), 495-500, 2001
一般社団法人 資源・素材学会
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詳細情報 詳細情報について
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- CRID
- 1390001206017153792
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- NII論文ID
- 10007565723
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- NII書誌ID
- AN10062646
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- COI
- 1:CAS:528:DC%2BD3MXkvVeqtLc%3D
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- ISSN
- 18806244
- 09161740
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- NDL書誌ID
- 5818379
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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
- Crossref
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- 抄録ライセンスフラグ
- 使用不可