The addition of more amino groups to ionic liquids is promising to enhance supported ionic liquid performance for low-temperature CO₂ capture. In our previous studies, 1-ethyl-3-methylimidazolium lysine ([EMIM][Lys]) impregnated on mesoporous silica SBA-15 and commercial PMMA polymer supports showed moderately acceptable CO₂ capture capacities. To improve sorbents performance, an amino acid ionic liquid (AAIL) (i.e., –1-aminoethyl-3-methylimidazolium lysine ([AEMIM][Lys]) with one additional amino group attached to the imidazole ring) was synthesized and immobilized into SBA-15 and PMMA with different loadings. The main purpose is to develop efficient AAIL-based sorbents with high CO₂ capture capacities and to study the effect of an additional amino group on CO₂ adsorption uptakes. 50 wt% [AEMIM][Lys]-immobilized on PMMA exhibited the best CO₂ capture capacities of 1.5 mmol/g-sorb and 0.82 mol/mol-AAIL at adsorption-desorption conditions of 30 °C and 100 °C respectively, and under flue gas (CO₂ composition of 15 %), when compared with previous results (1.06 mmol/g-sorb and 0.54 mol/mol-AAIL for 50 wt% [EMIM][Lys] supported on PMMA) under the same condition. This higher capacity demonstrated the efficiency of an additional amino group, though slightly far from the theoretical values (2.75 mmol/g-sorb and 1.5 mol/mol-AAIL). Cyclic performances were also conducted to assess the sorbents long-term stabilities.

向离子液体中添加更多的氨基有望增强用于低温CO ₂捕集的支持的离子液体性能。在我们之前的研究中，浸渍在中孔二氧化硅SBA-15和商业PMMA聚合物载体上的1-乙基-3-甲基咪唑赖氨酸（[EMIM] [Lys]）表现出中等程度的CO ₂捕获能力。为了提高吸附剂的性能，合成了一种氨基酸离子液体（AAIL）（即，在咪唑环上连接一个氨基的–1-氨乙基-3-甲基咪唑赖氨酸（[AEMIM] [Lys]））并将其固定在SBA中-15和PMMA的负载不同。主要目的是开发具有高CO _2的高效AAIL基吸附剂捕获能力并研究其他氨基对CO ₂吸收吸收的影响。固定在PMMA上的50 wt％[AEMIM] [Lys]分别在30°C和100°C的吸附-解吸条件下表现出最佳的CO ₂捕集能力，分别为1.5 mmol / g-sorb和0.82 mol / mol-AAIL。在相同条件下，与烟道气（CO ₂组成为15％）相比，以前的结果（在PMMA上负载50 wt％[EMIM] [Lys]的结果为1.06 mmol / g-sorb和0.54 mol / mol-AAIL）。该较高的容量证明了额外氨基的效率，尽管与理论值（2.75 mmol / g-sorb和1.5 mol / mol-AAIL）略有不同。还进行了循环性能以评估吸附剂的长期稳定性。