Acta Chimica Sinica ›› 2010, Vol. 68 ›› Issue (17): 1749-1757. Previous Articles     Next Articles

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  1. (1华中农业大学资源与环境学院 武汉 430070)
    (2华中农业大学理学院 武汉 430070)
  • 收稿日期:2009-12-25 修回日期:2010-03-24 出版日期:2010-09-14 发布日期:2010-05-11
  • 通讯作者: 刘名茗
  • 基金资助:


Preparation of Novel Ionic Liquids-Based Sol-Gel Coatings for Solid-Phase Microextraction

Zhou Xin1 Shang Jia1 Liu Mingming*,1 Liu Hanlan2 Hao Rong1 Feng Xionghan1 Liu Fan1   

  1. (1 College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070)
    (2 College of Science, Huazhong Agricultural University, Wuhan 430070)
  • Received:2009-12-25 Revised:2010-03-24 Online:2010-09-14 Published:2010-05-11
  • Contact: Liu MingMing
  • Supported by:

    ;the Specialized Research Fund for the Doctoral Program of Higher Education of China;the Scientific Research Starting Foundation for the introduced talents of Huazhong Agricultural University;the Students Research Fund of Huazhong Agricultural University

Two hydroxylethyl-functionalized ionic liquids (ILs), 1-(2 -hydroxylethyl)-3-methylimidazolium tetrafluoroborate (HEMIM[BF4]) and 1-(2 -hydroxylethyl)-3-methylimidazolium bis-(trifluoromethanesulfonyl)imide (HEMIM[N(SO2CF3)2]) were first used as selective stationary phase to prepare ILs-hy- droxyl-terminated silicone oil (OH-TSO) hybrid organic-inorganic coatings for solid-phase microextraction (SPME) by sol-gel technology. The underlying mechanism of the sol-gel reaction was proposed and the successful binding of ILs to the sol-gel substrate was confirmed by FT-IR spectra. The performance of these two ILs-based coatings was somewhat different, depending on the type of anions in ILs structure. Firstly, in contrast to HEMIM[N(SO2CF3)2]-OH-TSO coating, the pores on the surface of HEMIM[BF4]-OH-TSO coating are arranged more orderly and uniformly with a smaller size. Secondly, the HEMIM- [N(SO2CF3)2]-based fibers had much higher thermal stability compared with the HEMIM[BF4]-based fibers. Thirdly, the extraction efficiency of HEMIM[BF4]-OH-TSO fiber towards phenolic environmental estrogens and aromatic amines was superior to that of HEMIM[N(SO2CF3)2]-OH-TSO fiber, and OH-TSO fiber without ILs. Moreover, these ILs-based SPME fibers had wonderful solvent resistance, wide useable pH range and good coating preparation reproducibility. Efficient analysis of aromatic amines with headspace SPME-GC was achieved using sol-gel-derived HEMIM[N(SO2CF3)2]-OH-TSO fiber. The method showed linear response over three to four orders of magnitude. The limits of detection were very low, ranged between 6.3 and 201.3 ng/L. The relative standard deviation values were below 7% and the recovery varied from 87.4% to 111.5%.

Key words: ionic liquids, solid-phase microextraction, sol-gel, phenolic environmental estrogens, aromatic amines