School of Environment, Henan Key Laboratory for Environmental Pollution Control, Key Laboratory for Yellow and Huai River Water Environmental Pollution Control, Ministry of Education, Henan Normal University, Xinxiang, Henan, P. R. China; School of Public Health, Xinxiang Medical University, Xinxiang, Henan, P. R. China.
J Sep Sci. 2013 Oct;36(19):3277-84. doi: 10.1002/jssc.201300361. Epub 2013 Aug 23.
A novel 1-butyl-3-methylimidazolium chloride ionic liquid surface imprinted solid-phase sorbent was synthesized. The as-prepared material was characterized by SEM, Brunauer-Emmett-Teller surface area analysis and Fourier Transform IR measurements. Then its adsorption properties for alkyl imidazolium ionic liquids, including adsorption capacities, adsorption kinetics, and properties of selective separation and enrichment were studied in detail. It was shown that the ionic liquid surface imprinted polymer exhibited high selective recognition characteristics for the imidazolium chloride ionic liquids with short alkyl chains (C(n)mimCl, n = 2, 4, 6, 8) and the adsorption equilibrium was achieved within 25 min. Various parameters were optimized for the 1-butyl-3-methylimidazolium chloride ionic liquid surface imprinted polymer SPE column, such as flow rate, eluent solvent, selectivity, and reusability of the column. Then, the SPE column coupled with HPLC was used for the determination of alkyl imidazolium ionic liquids. Experimental results showed that the existence of their structural analogs and common concomitants in environmental matrices did not affect the enrichment of 1-butyl-3-methyl imidazolium chloride ionic liquid. The average recoveries of 1-butyl-3-methylimidazolium chloride ionic liquid in spiked water samples were in the range of 92.0-102.0% with the RSD lower than 5.8%.
一种新型的 1-丁基-3-甲基氯化咪唑离子液体表面印迹固相萃取剂被合成。所制备的材料通过 SEM、BET 比表面积分析和傅里叶变换红外测量进行了表征。然后详细研究了其对烷基咪唑离子液体的吸附性能，包括吸附容量、吸附动力学以及选择性分离和富集的性能。结果表明，离子液体表面印迹聚合物对短链烷基（C(n)mimCl，n=2,4,6,8）的氯化咪唑离子液体表现出高的选择性识别特征，吸附平衡在 25 分钟内达到。对 1-丁基-3-甲基氯化咪唑离子液体表面印迹聚合物 SPE 柱的各种参数进行了优化，如流速、洗脱溶剂、柱的选择性和可重复性。然后，将 SPE 柱与 HPLC 联用，用于烷基咪唑离子液体的测定。实验结果表明，环境基质中其结构类似物和常见共存物的存在并不影响 1-丁基-3-甲基氯化咪唑离子液体的富集。在加标水样中，1-丁基-3-甲基氯化咪唑离子液体的平均回收率在 92.0-102.0%之间，相对标准偏差低于 5.8%。
