کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1214564 | 966938 | 2011 | 7 صفحه PDF | دانلود رایگان |
In this paper, the preparation of new supported ionic liquids (SILs) composed of the N-methylimidazolium cation and the quinoline cation is described. They have been confirmed and evaluated by infrared spectroscopy, elemental analysis and thermogravimetric analysis. Six kinds of different SILs included SiO2·Im+·Cl−, SiO2·Im+·BF4−, SiO2·Im+·PF6−, SiO2·Qu+·Cl−, SiO2·Qu+·BF4− and SiO2·Qu+·PF6−. The adsorption characteristics of ferulic acid (FA), caffeic acid (CA) and salicylic acid (SA) on SILs were investigated by static adsorption experiments. It was found that SiO2·Qu+·Cl− had excellent adsorption and desorption capacity to three tested phenolic compounds. The dynamic adsorption characteristics of FA, CA and SA on SiO2·Qu+·Cl− were also studied. The saturated adsorption capacity of FA, CA and SA using SiO2·Qu+·Cl− as adsorbent was 64.6 mg/g, 53.2 mg/g and 72.2 mg/g respectively. Using 70% ethanol as eluent, the saturated desorption efficiencies of FA, CA and SA were 97.2%, 90.3% and 96.5% respectively. Thus, SiO2·Qu+·Cl− had strong adsorption and separation capacity for FA, CA and SA.
Journal: Journal of Chromatography B - Volume 879, Issue 19, 1 June 2011, Pages 1697–1703