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Abstract: An ionic liquid (IL) surface molecularly imprinted polymer (MIP) was prepared using 1-octyl-3-methylimidazolium chloride ([C8mim]Cl) as the template and acylated ethylenediamine-poly(styrene-divinylbenzene) particle as the supported material. The obtained MIP material was characterized by scanning electron microscopy, Brunauer-Emmett-Teller surface area analysis, and FT-IR spectroscopy. The adsorption property and selective recognition performance of [C8mim]ClMIP were studied by static adsorption and solid-phase extraction coupled with high-performance liquid chromatography. Next, the effect of alkyl chain length of imidazolium cations on the adsorption characteristics of [C2mim]ClMIP, [C4mim]ClMIP, and [C8mim]ClMIP was examined in detail. It was shown that the adsorption selectivity of the three IL MIPs was significantly affected by the alkyl chain length. [C8mim]ClMIP exhibited broad recognition characteristics for all the imidazolium chloride ILs studied ([C n mim]Cl, n = 2, 4, 6, 8, 12, 16), and the adsorption equilibrium was achieved within 40 min. [C4mim]ClMIP could enrich [Cnmim]Cl (n = 2, 4, 6, 8), but [C2mim]ClMIP could only recognize [C2mim]Cl and [C4mim]Cl selectively. It is obvious that the adsorption selectivity of the IL MIPs increased with the decrease of alkyl chain length of the template molecules. Furthermore, the possible recognition mechanism was suggested
Template and target information: 1-octyl-3-methylimidazolium chloride, [C8mim]Cl
Author keywords: extraction, 1-Octyl-3-methylimidazolium chloride, Ionic Liquids, polymerization, selective adsorption, high-performance liquid chromatography