Predictive evaluation of ion-exchange selectivity on a titanium antimonate cation exchanger
Predictive evaluation of ion-exchange selectivity on a titanium antimonate cation exchanger
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钛锑酸盐阳离子交换剂离子交换选择性的预测评估
DOI：
10.1039/ft9938900851
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Y. Tamaura
中科院分区：
文献类型：
--
作者：
M. Tsuji;H. Kaneko;Y. Tamaura
研究了锑酸钛阳离子交换剂对二价过渡金属和稀土金属离子与氢离子交换的选择性。一个特定的选择性功能，发现这种交换器通过凯兰和朗缪尔图。从离子交换的Kielland图导出了Langmuir方程，发现Langmuir常数依赖于总离子浓度。对数刻度上的校正选择性系数KMH与交换剂中金属离子的当量分数（文本装饰：overlineXM）的曲线图显示，对于二价金属离子，文本装饰处的折点为：overlineXM= 0.01-0.02，对于稀土金属离子，文本装饰处的折点为：overlineXM= 0.005。这种行为可以解释为假设一个两个网站的模型。在无限小文本装饰中可用的一个位置：overlineXM值具有高空间限制。二价金属离子的Kieland系数Cm在-190至-1.1范围内，稀土金属离子的Cm在-110至-17范围内。在无穷小交换，文本装饰：overlineXM= 0的分布系数，Kd，进行了评估。
Ion-exchange selectivity has been investigated for exchange of divalent transition-metal and rare-earth-metal ions with hydrogen ions on titanium antimonate cation exchangers. A specific selectivity feature was found for this exchanger through the Kielland and Langmuir plots. The Langmuir equation has been derived from the Kielland plot of the ion exchange, and the Langmuir constant was found to be dependent upon the total ion concentration. Plots of the corrected selectivity coefficients, KMH, on the logarithmic scale vs. the equivalent fraction of metal ions in the exchanger, text-decoration:overlineXM, showed a break point at text-decoration:overlineXM= 0.01–0.02 for the divalent metal ions and at text-decoration:overlineXM= 0.005 for the rare-earth-metal ions. This behaviour can be interpreted assuming a two-site model. One site available at infinitesimal text-decoration:overlineXM value has a high steric limitation. The Kielland coefficients, Cm, were found to be in the range –190 to –1.1 for the divalent metal ions and –110 to –17 for the rare-earth-metal ions. The distribution coefficients, Kd, at an infinitesimal exchange, text-decoration:overlineXM= 0, were evaluated.
DOI：
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发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
--
影响因子：
2.8
作者：
OOI, K;MIYAI, Y;KATOH, S
通讯作者：
KATOH, S