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Synergistic effect of temperature and background counterions on ion-exchange equilibria

机译：温度和背景抗度对离子交换均衡的协同作用

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摘要

The effects of temperature and background counterions on ion-exchange selectivity for alkali metal ions and tetraalkylammoniumions on strongly acidic cation-exchange resins have been investigated using superheated water ion-exchange chromatography (SW-IEC). We have found out that alkali metal ions show reversal in the order of the distribution coefficient (K-D), from Li+ Na+ K+ Rb+ in water at ordinary temperature to Rb+ K+ Na+ Li+ in superheated water, when a relatively large cation such as cesium ion is used as the background counterion. The effect of counterion on the ion-exchange selectivity is enhanced with the ion-exchange resins of higher ion-exchange capacity and cross-linking degree. Tetraalkylammonium ions chosen as model ions for poorly hydrated ions also exhibit reversal in the order of K-D at around 430 K in superheated water. However, the effect of the nature of alkali metal counterions on the change in K-D values of tetraalkylammonium ions is rather small compared with the effect on the K-D of alkali metal ions. These results are attributed to the change in local hydration structures of the ions in the ion-exchange resin due to dehydration of alkali metal ions enhanced by interionic contacts of the analyte ion with the coexisting counterion and lower hydration energy of the ions at elevated temperatures. Although it has been considered that temperature is not effective at changing the ion-exchange separation selectivity, significant selectivity changes can be achieved by SW-IEC.
机译：采用过热水离子交换色谱法（SW-IEC）研究了温度和背景对抗对碱金属离子和四烷基鎓的离子交换选择性和四烷基氨基的影响。我们发现碱金属离子以分布系数（K-D）的顺序显示逆转，来自Li +＆ na +＆ k + +＆在普通温度下的rb +在水中至rb + + + k + +＆ na +＆ Li +在过热水中，当诸如铯离子等相对较大的阳离子时用作背景逆度。通过更高的离子交换能力和交联度的离子交换树脂增强了对离离子交换选择性的影响。选择作为较低水合离子的模型离子的四烷基铵离子在过热水中的K-D约为430k的阶段也表现出逆转。然而，与碱金属离子K-D的效果相比，碱金属抗衡性本质对四烷基铵离子的k-d值的变化相当小。这些结果归因于离子交换树脂中离子在离子交换树脂中的局部水化结构的变化，由于分析物离子与升高温度下的离子的共存抗衡偶联和降低水合能量增强的碱金属离子的脱水。尽管已经认为温度在改变离子交换分离选择性时，但是通过SW-IEC可以实现显着的选择性变化。

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  • 来源
    《RSC Advances》 |2018年第47期|共8页
  • 作者

    Shibukawa Masami; Yanagisawa Masaru; Morinaga Ryota; Shimasaki Tomomi; Saito Shingo; Wang Shao-ting; Feng Yu-qi;

  • 作者单位

    Saitama Univ Grad Sch Sci &

    Engn Sakura Ku 255 Shimo Okubo Saitama 3388570 Japan;

    Saitama Univ Grad Sch Sci &

    Engn Sakura Ku 255 Shimo Okubo Saitama 3388570 Japan;

    Saitama Univ Grad Sch Sci &

    Engn Sakura Ku 255 Shimo Okubo Saitama 3388570 Japan;

    Saitama Univ Grad Sch Sci &

    Engn Sakura Ku 255 Shimo Okubo Saitama 3388570 Japan;

    Saitama Univ Grad Sch Sci &

    Engn Sakura Ku 255 Shimo Okubo Saitama 3388570 Japan;

    Wuhan Univ Dept Chem Key Lab Analyt Chem Biol &

    Med Minist Educ Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ Dept Chem Key Lab Analyt Chem Biol &

    Med Minist Educ Wuhan 430072 Hubei Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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