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Facile synthesis of a novel polymer/covalent organic framework@silica composite material in deep eutectic solvent for mixed-mode liquid chromatographic separation

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Abstract

The solvothermal synthesis of covalent organic framework (COF) modified silica gel usually requires the use of harmful organic solvents, tedious steps, and harsh reaction conditions. In pursuit of green chemistry, a new strategy for the facile preparation of COF@SiO2 composite material was realized in this work by using a low-toxicity and low-cost deep eutectic solvent as the reaction medium. Additionally, a flexible polyacrylic acid (PAA) was introduced for the purpose of improving the hydrophilic selectivity and separation efficiency of COF@SiO2. Based on the above ideas, a novel PAA/COF@SiO2 composite was successfully developed as a liquid chromatographic packing material. Performance evaluation of the slurry-packed PAA/COF@SiO2 column showed that diverse types of analytes were effectively separated, and the retention behavior of polar nucleosides showed a U-shaped trend, indicating mixed-mode of hydrophobic/hydrophilic retention mechanisms. Thermodynamic studies revealed that the separation mechanism was largely independent of temperature. This work verifies the feasibility of synthesizing polymer/COF@SiO2 composite material in the deep eutectic solvent. This strategy provides a theoretical reference for the green and facile preparation of COF@SiO2 as an efficient liquid chromatographic stationary phase.

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Acknowledgements

The authors express their sincere thanks to the support of National Natural Science Foundation of China (No. 21906124), Natural Science Foundation of Hubei Province (No. 2017CFB220), and Graduate Innovative Fund of Wuhan Institute of Technology (No. CX2022430).

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Authors and Affiliations

  1. School of Chemistry and Environmental Engineering, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Key Laboratory of Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan, 430205, China

    Wanjiao Wei, Lulu Zhao, Yuefei Zhang, Wei Chen & Sheng Tang

  2. School of Pharmacy, Linyi University, Shuangling Road, Linyi, 276000, Shandong, China

    Yanjuan Liu

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  1. Wanjiao Wei
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Correspondence to Sheng Tang.

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Wei, W., Zhao, L., Liu, Y. et al. Facile synthesis of a novel polymer/covalent organic framework@silica composite material in deep eutectic solvent for mixed-mode liquid chromatographic separation. Microchim Acta 191, 35 (2024). https://doi.org/10.1007/s00604-023-06116-z

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