In this study, eight amino acid-based ionic liquids (AAILs) with 1-butyl-4-methyl pyridinium cation ([B₄MPyr][AA]s) were synthesized and characterized. The CO₂ absorption capacity of AAILs was studied using quartz crystal microbalance (QCM) at pressures up to 6 bars and at temperature 298.15 K. Based on the “deactivated model”, the reaction equilibrium constant and Henry's law constant were calculated to evaluate the efficiency of AAILs for CO₂ absorption. The results indicate that CO₂ absorption capacities are in the order of [Arg] > [Lys] > [His] > [Tyr] > [Gly] > [Val] > [Ala] > [Pro]. The accessibility of more available amine groups in AAIL with arginate anion is the main factor for the high CO₂ absorption capacity. Also, the chemical absorption of CO₂ through carbamate formation was corroborated by spectroscopy of FT-IR. Besides, the density functional theory (DFT) method was also employed to confirm the adsorption energy of CO₂ onto AAILs with various anions.

在本研究中，合成并表征了八种具有 1-丁基-4-甲基吡啶鎓阳离子 ([B ₄ MPyr][AA]) 的氨基酸离子液体 (AAIL) 。使用石英晶体微量天平 (QCM) 在高达 6 bar 的压力和 298.15 K 的温度下研究 AAILs的 CO ₂吸收能力。基于“失活模型”，计算反应平衡常数和亨利定律常数以评估效率用于 CO ₂吸收的 AAIL 。结果表明CO ₂吸收能力的顺序为[Arg] > [Lys] > [His] > [Tyr] > [Gly] > [Val] > [Ala] > [Pro]。AAIL 中更多可用胺基团与精氨酸阴离子的可及性是高 CO ₂的主要因素吸收能力。此外，通过 FT-IR 光谱证实了通过氨基甲酸酯形成对 CO ₂的化学吸收。此外，还采用密度泛函理论（DFT）方法来确认CO ₂在具有各种阴离子的AAILs上的吸附能。