Functionalized imidazole–alkanolamine deep eutectic solvents with remarkable performance for low-concentration SO2 absorption

Dongwook Lee, Won Yong Choi, Kyumin Jang, Jinwon Park, Yunsung Yoo

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


SO2 generated by manufacturing facilities, power plants, and ships must be removed because it adversely affects human health even at low concentrations. Flue gas desulfurization (FGD), which is a conventional method for removing SO2, causes additional environmental issues, including non-recyclable reactants and wastewater. In this study, deep eutectic solvents (DESs) functionalized to absorb SO2 at low concentrations are developed as alternatives for FGD. The physical properties, including thermal stability, of the prepared DESs were analyzed, and an enhancement in thermal stability, attributed to DES formation, was verified. Additionally, absorption capacities and reusability under 500 ppm SO2 were analyzed through experiments involving the absorption, desorption, and reabsorption cycles. The thermal stabilities of the as-prepared DESs significantly improved compared to those of the precursors. In addition, the prepared absorbents exhibited remarkable SO2 absorption performance owing to multi-site absorption, with values of 0.992, 0.684, and 0.628 g SO2/g absorbent, which are more than twice higher than those reported in previous studies. Finally, the absorption mechanism was confirmed using 1H nuclear magnetic resonance and Fourier Transform Infrared spectroscopy. Owing to the exceptional performance of the proposed absorbents, this study is expected to make a significant contribution to the alternative technology research on SO2 separation.

Original languageEnglish
Article number122782
JournalSeparation and Purification Technology
Publication statusPublished - 2023 Feb 15

Bibliographical note

Publisher Copyright:
© 2022 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Filtration and Separation


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