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Understanding the Interaction of Boric Acid and CO2 with Ionic Liquids in Aqueous Medium by Multinuclear NMR Spectroscopy
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering. (Chemistry of Interfaces)ORCID iD: 0000-0002-6810-1882
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering. Department of Physics, Warwick University, Coventry, U.K.ORCID iD: 0000-0003-1067-7990
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-3652-7798
2020 (English)In: ACS Sustainable Chemistry & Engineering, Vol. 8, p. 552-560Article in journal (Refereed) Epub ahead of print
Abstract [en]

Boric acid is known to enhance the kinetics of CO2 absorption by some active aqueous solutions. However, the mechanism of interaction of boric acid with the CO2 in the presence of active molecules is not yet fully understood. In this work, interaction and dynamics of ions in aqueous solutions of functionalized choline-based ionic liquids [N1,1,5,2OH][Threo] and [N1,1,5,2OH][Tau] in the presence of boric acid and CO2 is thoroughly investigated using multinuclear NMR approach: 13C and 11B NMR spectroscopy, 11B NMR transverse relaxation as well as 1H and 11B NMR diffusometry. 13C and 11B NMR spectroscopy has revealed the formation of borate based complexes as a result of reaction between boric acid and anions of the ILs at ionic liquid/boric acid molar ratios larger than ca. 0.15. The formation of these complexes and their dynamics are further investigated using 11B relaxation, and 1H and 11B pulse-field-gradient (PFG) NMR. A plausible reaction mechanisms of boric acid with the anions of the IL, formation of the borate complexes and dissociation of these complexes facilitated by CO2 molecules are suggested.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2020. Vol. 8, p. 552-560
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-77093DOI: 10.1021/acssuschemeng.9b06068OAI: oai:DiVA.org:ltu-77093DiVA, id: diva2:1376103
Available from: 2019-12-07 Created: 2019-12-07 Last updated: 2020-02-20

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Filippov, AndreiAntzutkin, OlegShah, Faiz Ullah

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