期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1217, 期 32, 页码 5190-5196出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2010.06.013
关键词
Ionic liquid-modified silica; HPLC; PAHs; Ion-dipole interaction
资金
- Kumamoto University
- Japan Society for the Promotion of Science
- National Natural Science Foundation of China [20905073]
1-Allyl-3-butylimidazolium bromide ionic liquid [AyBIm]Br was prepared and used for the modification of mercaptopropyl-functionalized silica through surface radical chain-transfer addition. The obtained ionic liquid-modified silica (SiImBr) was characterized by elemental analysis, infrared spectroscopy, NMR spectroscopy, and thermogravimetric analysis. The selective retention behaviours of polycyclic aromatic hydrocarbons (PAHs) including some positional isomers were investigated using SiImBr as a stationary phase in reversed-phase liquid chromatography. The results showed that SiImBr presented multiple interactions including hydrophobic, pi-pi, and ion-dipole interactions during the separation of PAHs and dipolar compounds. However, it is proposed that pi-pi and ion-dipole interactions play important roles in the separation of PAHs and dipolar compounds. These results indicate that the ionic liquid-modified silica stationary phase is promising for future applications. A commercially available monomeric octadecylated silica (ODS) column and a custom-made poly(styrene)-grafted silica (Sil-St(n)) column were used as references. (C) 2010 Elsevier B.V. All rights reserved.
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