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首页> 外文期刊>RSC Advances >One-pot synthesis of UiO-66@SiO2 shell-core microspheres as stationary phase for high performance liquid chromatography
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One-pot synthesis of UiO-66@SiO2 shell-core microspheres as stationary phase for high performance liquid chromatography

机译：UIO-66 @ SiO2壳核微球的单盆合成作为高效液相色谱的固定相

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摘要

The unusual properties of ultrahigh surface area, adsorption affinity and shape selectivity make metal-organic frameworks (MOFs) a promising candidate as the stationary phase for high performance liquid chromatography (HPLC). However, the problems of high column backpressure and low column efficiency resulting from the direct packing of irregular MOF particles still remain in the HPLC separation. Herein, a facile one-pot synthesis method for the fabrication of MOFs@SiO2 shell-core microspheres was developed with aminosilica as the supporting substrate to grow the MOF shell. The density and particle size of the MOF shell could be easily controlled by adjusting the concentration of reactants, reaction temperature and time. UiO-66 (UiO for University of Oslo) was chosen as a model MOF because of its excellent chemical stability and unique reverse shape selectivity. The selected compounds including xylenes and ethylbenzene were effectively separated on the prepared UiO-66@SiO2 packed column with high resolution, good reproducibility and low column backpressure. The UiO-66@SiO2 packed column showed both reverse shape selectivity and a molecular sieving effect, making it attractive for the separation of structural isomers. Besides, the retention of analytes was also ascribed to the synergic effect of the hydrogen bonding between analytes and the amino groups of aminosilica, the hydrophobic effect and the pi-pi interaction between analytes and the aromatic rings of the UiO-66 shell.
机译：超高表面积，吸附亲和力和形状选择性的不寻常性质使金属有机框架（MOF）成为高效液相色谱（HPLC）的静止相的有希望的候选者。然而，由不规则MOF颗粒的直接包装产生的高柱背压和低柱效率的问题仍然存在于HPLC分离中。在此，用氨基硅作为支撑基材开发了用于制备MOFS的容易单罐合成方法，作为支撑基材以生长MOF壳。通过调节反应物，反应温度和时间的浓度，可以容易地控制MOF壳的密度和粒度。由于其优异的化学稳定性和独特的反向形状选择性，因此选择了UIO-66（UIO为Oslo大学）作为模型MOF。在制备的UIO-66 @ SiO 2包装柱上有效地分离出包括二甲苯和乙苯的所选化合物，具有高分辨率，再现性好，低塔背压。 UIO-66 @ SiO2填充柱显示逆形状选择性和分子筛分效果，使其对结构异构体的分离具有吸引力。此外，分析物的保留还归因于分析物和氨基硅藻，疏水效应和分析物之间的芳环之间的氨基之间的氢键合的协同作用和分析物之间的芳环与UIO-66壳的芳环之间。

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  • 来源
    《RSC Advances》 |2015年第2期|共8页
  • 作者

    Zhang Xiaoqiong; Han Qiang; Ding Mingyu;

  • 作者单位

    Tsinghua Univ Beijing Key Lab Microanalyt Methods &

    Instrumenta Dept Chem Beijing 100084 Peoples R China;

    Tsinghua Univ Beijing Key Lab Microanalyt Methods &

    Instrumenta Dept Chem Beijing 100084 Peoples R China;

    Tsinghua Univ Beijing Key Lab Microanalyt Methods &

    Instrumenta Dept Chem Beijing 100084 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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