Phase Behavior of Aqueous Biphasic Systems with Choline Alkanoate Ionic Liquids and Phosphate Solutions: The Influence of pH

Berton, Paula; Tian, Hongzhe; Rogers, Robin D.

doi:10.3390/molecules26061702

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Phase Behavior of Aqueous Biphasic Systems with Choline Alkanoate Ionic Liquids and Phosphate Solutions: The Influence of pH

by

Paula Berton

^1,2

,

Hongzhe Tian

^1,3,* and

Robin D. Rogers

^1,4,*

¹

Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, QC H3A 0B8, Canada

²

Chemical and Petroleum Engineering Department, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada

³

Plant Protection College, Shenyang Agricultural University, 120 Dongling Road, Shenyang 110161, China

⁴

525 Solutions Inc., P.O. Box 2206, Tuscaloosa, AL 35403, USA

^*

Authors to whom correspondence should be addressed.

Molecules 2021, 26(6), 1702; https://doi.org/10.3390/molecules26061702

Submission received: 7 February 2021 / Revised: 11 March 2021 / Accepted: 15 March 2021 / Published: 18 March 2021

(This article belongs to the Special Issue New Trends in Ionic Liquids Application)

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Abstract

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] ≈ [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. ¹H-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%.

Keywords: aqueous biphasic system; choline alkanoate ionic liquid; pH effect; phosphate solution; triazine-based herbicides

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MDPI and ACS Style

Berton, P.; Tian, H.; Rogers, R.D. Phase Behavior of Aqueous Biphasic Systems with Choline Alkanoate Ionic Liquids and Phosphate Solutions: The Influence of pH. Molecules 2021, 26, 1702. https://doi.org/10.3390/molecules26061702

AMA Style

Berton P, Tian H, Rogers RD. Phase Behavior of Aqueous Biphasic Systems with Choline Alkanoate Ionic Liquids and Phosphate Solutions: The Influence of pH. Molecules. 2021; 26(6):1702. https://doi.org/10.3390/molecules26061702

Chicago/Turabian Style

Berton, Paula, Hongzhe Tian, and Robin D. Rogers. 2021. "Phase Behavior of Aqueous Biphasic Systems with Choline Alkanoate Ionic Liquids and Phosphate Solutions: The Influence of pH" Molecules 26, no. 6: 1702. https://doi.org/10.3390/molecules26061702

APA Style

Berton, P., Tian, H., & Rogers, R. D. (2021). Phase Behavior of Aqueous Biphasic Systems with Choline Alkanoate Ionic Liquids and Phosphate Solutions: The Influence of pH. Molecules, 26(6), 1702. https://doi.org/10.3390/molecules26061702

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Phase Behavior of Aqueous Biphasic Systems with Choline Alkanoate Ionic Liquids and Phosphate Solutions: The Influence of pH

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