Kinetic aspects and swelling changes of magnesium and cerium titano-antimonates in aqueous and mixed solvents

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• 作者：Essam S. Zakaria ; Ismail M. Ali ; Hisham F. Aly
• 关键词：Titano-antimonate ; Ion diffusion ; Swelling behavior ; Mixed solvents
• 刊名：Journal of Colloid and Interface Science
• 出版年：2009
• 出版时间：15 October 2009
• 年：2009
• 卷：338
• 期：2
• 页码：346-352
• 全文大小：619 K

文摘

Magnesium titano-antimonate (MgTi₅Sb₂O₁₆·12.5H₂O) and cerium titano-antimonate (Ce₂.₇Ti₅Sb₂O₁₉·15.0H₂O) were synthesized as new cation exchangers using the in situ precipitation technique. Physico-chemical investigations showed different behaviors for the obtained materials. The materials have significant stability at high acid concentration and temperature. The ion exchange capacity for Cs⁺ in the presence of different alcoholic solvents was found to increase and generally obey the order C₂H₅OH > CH₃OH > H₂O. Diffusion coefficients (D_i) and thermodynamic parameters of Cs⁺ exchange in both magnesium and cerium titano-antimonates in aqueous and alcoholic solutions were calculated. The swelling ratios of the materials were predicted by applying modified calculations at constant values of D_i. The results showed insignificant swelling behavior in the presence of organic solvents.