title: Research on the adsorption property of supported ionic liquids for ferulic acid, caffeic acid and salicylic acid.
abstract: 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 SiO(2)·Im(+)·Cl(-), SiO(2)·Im(+)·BF(4)(-), SiO(2)·Im(+)·PF(6)(-), SiO(2)·Qu(+)·Cl(-), SiO(2)·Qu(+)·BF(4)(-) and SiO(2)·Qu(+)·PF(6)(-). 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 SiO(2)·Qu(+)·Cl(-) had excellent adsorption and desorption capacity to three tested phenolic compounds. The dynamic adsorption characteristics of FA, CA and SA on SiO(2)·Qu(+)·Cl(-) were also studied. The saturated adsorption capacity of FA, CA and SA using SiO(2)·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, SiO(2)·Qu(+)·Cl(-) had strong adsorption and separation capacity for FA, CA and SA.
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi, China.
authors.forename: Ni
authors.initials: N
authors.lastname: Du
authors.forename: Shuwen
authors.initials: S
authors.lastname: Cao
authors.forename: Yanying
authors.initials: Y
authors.lastname: Yu
mesh_terms: D000327:Adsorption; D002109:Caffeic Acids / Q000737:chemistry / Q000302:isolation & purification*; D002412:Cations / Q000737:chemistry; D003373:Coumaric Acids / Q000737:chemistry / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D011804:Quinolines / Q000737:chemistry; D020156:Salicylic Acid / Q000737:chemistry / Q000302:isolation & purification*; D012821:Silanes / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: C548971:3-chloropropyltrimethoxysilane; D002109:Caffeic Acids; D002412:Cations; D003373:Coumaric Acids; D007093:Imidazoles; D052578:Ionic Liquids; D011804:Quinolines; D012821:Silanes; C004999:ferulic acid; C037219:quinoline; D020156:Salicylic Acid; C018100:1-methylimidazole; C040048:caffeic acid