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<p>The selective separation and precise analysis of rare earth elements (REEs) in impurity-laden matrices constitute persistent challenges. Among available separation techniques, ion-exchange chromatography has gained prominence as an effective approach for REE purification. However, the quest for a high-performance stationary phase preparation method continues to be a focal point. Herein, a propylsulfonic acid-functionalized stationary phase (Sil-SH-SCX) was developed through γ-mercaptopropyl trimethoxysilane (MPTS) grafting followed by oxidation. The Sil-SH-SCX demonstrated excellent chromatographic performance, achieving efficient separation of REEs with resolution ranging from 4.2 to 12.6 for adjacent lanthanides. Besides, the Sil-SH-SCX column displayed high repeatability (RSD &lt; 0.99%, <i>n</i> = 10) and stability (RSD &lt; 1.5%, <i>n</i> = 30). Taking advantage of its excellent separation performance, Sil-SH-SCX was successfully applied for the sensitive determination of REEs with excellent linearity (<i>R</i><sup>2</sup> = 0.996–0.999, 1–500&#xa0;mg&#xa0;L<sup>−1</sup>). This work provided an insight into the design of a&#xa0;chromatography stationary phase and expanded its potential application in REE analysis and purification.</p> Graphical abstract <p></p>

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Propylsulfonic acid-bonded silica stationary phase through mercapto oxidation for chromatographic separation of rare earth elements

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Yuqing Wei,
  • Chao Zhong,
  • Hongwei Zhao,
  • Qifang He,
  • Bo Zhang,
  • Hongdeng Qiu

摘要

The selective separation and precise analysis of rare earth elements (REEs) in impurity-laden matrices constitute persistent challenges. Among available separation techniques, ion-exchange chromatography has gained prominence as an effective approach for REE purification. However, the quest for a high-performance stationary phase preparation method continues to be a focal point. Herein, a propylsulfonic acid-functionalized stationary phase (Sil-SH-SCX) was developed through γ-mercaptopropyl trimethoxysilane (MPTS) grafting followed by oxidation. The Sil-SH-SCX demonstrated excellent chromatographic performance, achieving efficient separation of REEs with resolution ranging from 4.2 to 12.6 for adjacent lanthanides. Besides, the Sil-SH-SCX column displayed high repeatability (RSD < 0.99%, n = 10) and stability (RSD < 1.5%, n = 30). Taking advantage of its excellent separation performance, Sil-SH-SCX was successfully applied for the sensitive determination of REEs with excellent linearity (R2 = 0.996–0.999, 1–500 mg L−1). This work provided an insight into the design of a chromatography stationary phase and expanded its potential application in REE analysis and purification.

Graphical abstract