SO2 absorption in EmimCl–TEG deep eutectic solvents

Dezhong Yang; Shaoze Zhang; De-en Jiang; Sheng Dai

doi:10.1039/C8CP02250J

SO₂ absorption in EmimCl–TEG deep eutectic solvents†

Dezhong Yang,

*^a Shaoze Zhang,^bc De-en Jiang

*^c and Sheng Dai

*^de

Author affiliations

* Corresponding authors

^a School of Science, China University of Geosciences, Beijing 100083, China
E-mail: yangdz@cugb.edu.cn

^b Key Laboratory for Advanced Materials and School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China

^c Department of Chemistry, University of California, Riverside, California 92521, USA
E-mail: djiang@ucr.edu

^d Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
E-mail: dais@ornl.gov

^e Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA

Abstract

Deep eutectic solvents (DESs) based on 1-ethyl-3-methylimidazolium chloride (EmimCl) and triethylene glycol (TEG) with different molar ratios (from 6 : 1 to 1 : 1) were prepared. FTIR and theoretical calculation indicated that the C₂–H on the imidazolium ring form hydrogen bonds with the hydroxyl group rather than the ether O atom of the TEG. The EmimCl–TEG DESs can efficiently capture SO₂; in particular, EmimCl–TEG (6 : 1) can capture 0.54 g SO₂ per gram of solvent at 0.10 atm and 20 °C, the highest absorption amount for DESs under the same conditions. Theoretical calculation showed that the high SO₂ absorption capacity was mainly due to the strong charge-transfer interaction between SO₂ and the anion Cl⁻. Moreover, SO₂ desorption in the DESs can be controlled by tuning the interaction between EmimCl and TEG, and the DESs can be cycled many times.

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Article information

DOI: https://doi.org/10.1039/C8CP02250J
Article type: Paper
Submitted: 09 Apr 2018
Accepted: 02 May 2018
First published: 02 May 2018

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Phys. Chem. Chem. Phys., 2018,20, 15168-15173

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SO₂ absorption in EmimCl–TEG deep eutectic solvents

D. Yang, S. Zhang, D. Jiang and S. Dai, Phys. Chem. Chem. Phys., 2018, 20, 15168 DOI: 10.1039/C8CP02250J

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