HCa2Nb3O10·1.5H2O as an Ion Exchanger for NH4+ Ion Removal

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• 作者：Ramesh Chitrakar ; Satoko Tezuka ; Akinari Sonoda ; Hirotaka Kakita ; Kohji Sakane ; Kenta Ooi ; Takahiro Hirotsu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2008
• 出版时间：January 2, 2008
• 年：2008
• 卷：47
• 期：1
• 页码：176 - 179
• 全文大小：145K
• 年卷期：v.47,no.1(January 2, 2008)
• ISSN：1520-5045

文摘

The removal of NH₄⁺ on protonated layered perovskite oxide HCa₂Nb₃O₁₀·1.5H₂O from an aqueous solutionat room temperature using a batch method was investigated. The protons situated between the layers of thematerial are exchangeable with cations in solution. Distribution coefficient values, K_d (cm³/g), of Na⁺, K⁺,and NH₄⁺ cations at pH 2.2 from a mixed solution (NaCl, KCl, and NH₄Cl) containing 1.0 mmol/dm³ ofeach ion were 1600 for K⁺, 2200 for Na⁺, and 10 500 for NH₄⁺. The effect of solution pH on the ion exchangein aqueous solution (NH₄Cl + HCl or NH₄OH) showed a maximum uptake of 34 mg of NH₄/g at around pH6. The results indicate that the material is very effective for removing NH₄⁺ at concentrations of less than 10mg of NH₄/dm³.