Journal
MOLECULES
Volume 26, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/molecules26061702
Keywords
aqueous biphasic system; choline alkanoate ionic liquid; pH effect; phosphate solution; triazine-based herbicides
Funding
- Canada Excellence Research Chairs Program
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This study investigated aqueous biphasic systems (ABS) composed of choline alkanoate ionic liquids mixed with K3PO4 solutions at different pH values. The ability to form ABS varied with different ILs and pH, with decreasing biphasic regions observed as pH increased. Anion exchange between phases in ABS at neutral pH was also observed.
Aqueous biphasic systems (ABS) composed of the choline alkanoate ionic liquids (ILs) choline acetate [Cho][OAc], choline propanoate [Cho][Pro], choline butyrate [Cho][But], and choline hexanoate [Cho][Hex], mixed with K3PO4 solutions at pH 7.2 and 14.5, were prepared and their phase diagrams were compared. The ability to form ABS with alkaline K3PO4 solutions decreased in the order [Cho][OAc] approximate to [Cho][Pro] > [Cho][But] > [Cho][Hex], while with neutral K3PO4 solutions, [Cho][OAc] could not form an ABS, and the other three ILs performed similarly. All of the biphasic regions of the ABS decreased with the increase in pH. H-1-NMR data indicated anion exchange between phases in ABS at neutral pH. The ABS at neutral pH were evaluated to extract the triazine herbicides simazine, cyanazine, and atrazine, and the ABS formed by [Cho][Pro] and the pH 7.2 K3PO4 solution has shown extraction recoveries higher than 90%.
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