A novel non-aqueous absorbent of amino-functionalized ionic liquid for efficient CO2 capture

Functionalized ionic liquids have great potential for capturing CO 2 in mixed absorbents due to their unique structural and adjustable properties. In this work, a novel, highly efficient, and renewable non-aqueous absorbent of amino-functionalized ionic liquid, [TETAH][3-Br-PhO]-PEG200, is utilized for CO 2 capture. Here we mixture [TETAH][3-Br-PhO] and PEG200 in different proportions and studied the effects of reaction temperature, mass ratios, and the interaction between [TETAH][3-Br-PhO] and PEG200 on CO 2 absorption capacity. Based on the experimental results, the mechanism of CO 2 capture by [TETAH][3-Br-PhO]-PEG200 is elucidated using 13 C NMR and FTIR spectroscopy. The results indicate that at 298.15 K and a mass ratio of 3:7, the designed absorbent achieves an optimal effective absorption capacity of 2.37 mol/kg. The interaction between [TETAH][3-Br-PhO] and PEG200 enhances the CO 2 capture capacity of [TETAH][3-Br-PhO]-PEG200 and leads to the formation of a solid phase. After five cycles of absorption and desorption at 393.15 K, the optimal absorbent still maintains excellent recyclability and achieves a 72 % regeneration efficiency. Additionally, the non-aqueous absorbent of [TETAH][3-Br-PhO]-PEG200 exhibits high absorption performance and efficient recyclability compared to the traditional MEA. These findings suggest that [TETAH][3-Br-PhO]-PEG200 shows promise as a sustainable CO 2 absorbent material.