Abstract
The development of novel absorbents is essential for SO2 removal. In this study, a novel ionic liquid (IL, [BHEP][HSO4]) was prepared, and water was selected as the co-solvent. The density and viscosity of aqueous [BHEP][HSO4] were measured and the SO2 absorption performance was systematically investigated. Furthermore, the thermodynamic properties of SO2 in aqueous [BHEP][HSO4] were calculated. Additionally, the mechanism of SO2 absorption in aqueous [BHEP][HSO4] was confirmed using Fourier-transform infrared and nuclear magnetic resonance spectroscopy. It showed that [BHEP][HSO4] absorbed 0.302 g⋅g−1 (g SO2/g IL) at an SO2 partial pressure of 2000 μl⋅L−1 at 303.2 K, and the SO2 desorption enthalpy was −39.63 kJ⋅mol−1. The mechanistic study confirmed the chemical absorption of SO2 in aqueous [BHEP][HSO4].
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