Superbase-based deep eutectic solvents (DESs) with different active sites for CO₂ capture were synthesized in this work. The presence of ethylene glycol (EG) was found to play an important role for the CO₂ absorption by DESs. The absorption capacities of [DBUH][MLU]-EG (1:1) and [DBUH]₂[DMU]-EG (1:2) were up to 0.138 w/w and 0.163 w/w under 40 ℃ and 1 atm, respectively, which were much higher than those of pure ionic liquids (IL). The enhanced CO₂ absorption performance can be ascribed to the synergistic interaction of IL and EG. From the experimental results including nuclear magnetic spectroscopy analysis and quantum chemical calculations, it is found that EG can be activated by DBUH⁺. The activated EG had the ability to absorb CO₂, thereby realizing the coordinated absorption by imino and hydroxyl groups in the absorption system. The main insight in this work is to identify DESs with EG assisted, high absorption capacity and good desorption potential. This insight provides a broader idea for the field of acid gas capture.

在这项工作中，合成了具有不同活性位点以捕获CO ₂的基于超碱的深共熔溶剂（DES）。发现乙二醇（EG）的存在对DES吸收CO ₂具有重要作用。在40℃和1个大气压下，[DBUH] [MLU] -EG（1：1）和[DBUH] ₂ [DMU] -EG（1：2）的吸收容量分别为0.138 w / w和0.163 w / w分别比纯离子液体（IL）高得多。增强的CO ₂吸收性能可以归因于IL和EG的协同相互作用。根据包括核磁光谱分析和量子化学计算在内的实验结果，发现EG可以被DBUH ⁺激活。活化的EG具有吸收CO ₂的能力，从而在吸收体系中实现亚氨基和羟基的协同吸收。这项工作的主要见解是鉴定具有EG辅助，高吸收能力和良好解吸潜力的DES。这种见解为酸性气体捕获领域提供了更广阔的思路。