Effective extraction of quinine and Gramine (cas 87-52-5) from water by hydrophobic ionic liquids: The role of anion
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Add time:07/17/2019 Source:sciencedirect.com
In this work, a series of hydrophobic ionic liquids (ILs) with ClO4−, BF4−, PF6−, CF3SO3− and bis(trifluoromethanesulphonyl)imide (NTf2−) as anions were synthesized. Their extraction ability for the two alkaloids, quinine and Gramine (cas 87-52-5) was studied. The experimental results suggested that the extraction ability of ILs had no clear relationship with the alkyl chain length on the IL cation but depended on the hydrophobicity and hydrogen-bonding strength of the IL anion. The CF3SO3−-based ILs were stable against hydrolysis and exhibited better extraction ability for the two alkaloids. Thermodynamic analysis suggested that the extraction of the two alkaloids was an entropy-driven process. These results indicate that CF3SO3−-based ILs are ideal solvents for recovering alkaloids from the water phase.
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