Investigation of Amine-Based Ternary Deep Eutectic Solvents for Efficient, Rapid, and Reversible SO₂ Absorption

Wang, Chao; Bi, Qingwan; Huo, Yanling; Zhang, Zhenghongri; Tao, Duanjian; Shen, Yue; Zhu, Qian; Chen, Zhigang; Li, Huaming; Zhu, Wenshuai

Investigation of Amine-Based Ternary Deep Eutectic Solvents for Efficient, Rapid, and Reversible SO₂ Absorption

2021

Effective and reversible absorption of sulfur dioxide (SO₂) with commercially available and easily prepared absorbents now has drawn increasing concentration. In this work, a series of amine-based ternary deep eutectic solvents (DESs) composed of diethylenetriamine (DETA), acetamide (AA), and ethylene glycol (EG) were prepared to study the SO₂ absorption performance. Results demonstrate that these obtained ternary DESs not only exhibit a rapid absorption rate but also present desirable absorption capacity and cycling performance. Mass capacity of 0.82 g of SO₂/g of DES would be received with DETA/AA/EG (1:1:2) ternary DES, which could be ascribed to the Lewis acid–base interaction and hydrogen bonding between alkaline ternary DES and acidic SO₂. This work would provide a novel route to prepare ideal absorbents for effective SO₂ capture.

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