Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 117, Issue 1-2, Pages 436-443Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2008.07.017
Keywords
pi-Complexing sorbent; SBA-15; Supported ionic liquid phase; Solid-phase extraction; Polyunsaturated fatty acid methyl ester
Categories
Funding
- Department of Energy [DE-FG36-06G086025]
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Novel pi-complexing sorbents were prepared by covalently immobilizing ionic liquids (ILs) onto mesoporous SBA-15 using a one-pot sol-gel process followed by coating these SBA-15-supported IL compounds with silver salts. The mesoporous YE-complexing sorbents were characterized by small angle X-ray scattering (SAXS), FTIR, TEM, SEM, nitrogen adsorption desorption isotherm, NMR, and nitrogen elemental analysis. Two advantages were obtained using these novel mesoporous pi-complexing sorbents versus the traditional pi-complexing sorbents formed by directly anchoring silver salts onto silica gel. (1) Higher extraction capacities were found. The extraction capacity for the polyunsaturated fatty acid methyl ester (PUFAME), methyl all-cis-5,8,11,14,17-eicosapentaenoate (20:5 or EPA). was 195 mg/g sorbent using the mesoporous AgBF4/SBA-15 center dot IL center dot PF6 sorbent. The capacity decreased to 121 mg/g sorbent with microporous complexing sorbent AgBF4/SiO2 center dot IL center dot PF6. (2) Better reusability was also achieved. The supported IL phase immobilized and retained silver salt on SBA-15 due to the interaction between the ionic liquid's imidazolium cations and silver ions. Eight successive sorption runs with the AgBF4/SBA-15 center dot IL center dot PF6 sorbent showed a satisfactory reusability. The traditional pi-complexing sorbent has a silver salt directly anchored on silica without the supported ionic liquid phase. Higher silver leaching into organic solution occurred from the AgBF4/SBA-15 sorbent determined by ICP-AES. The combined percentage (wt%) of the omega-3 PUFAMEs: 20:5 and methyl all-cis-4,7,10,13,16,19-docosahexaenoate (22:6 or DHA) stripped from the AgBF4/SBA-15 center dot IL center dot PF6 by 1-hexene was significantly enriched from 18% in the original cod liver oil to 90.5%. (c) 2008 Elsevier Inc. All rights reserved.
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