CO₂ is a greenhouse gas that contributes a lot to the global warming. Ionic liquid is a kind of green solvent that shows great potential in CO₂ capture. The functionalized ionic liquid [TETAH][HCOO] was synthesized in this study, and CO₂ absorption performance by the mixture system made up from [TETAH][HCOO] and polyethylene glycol 200 (PEG200) was investigated. Results showed that there was a significant synergistic effect between [TETAH][HCOO] and PEG200 on CO₂ capture. PEG200 not only helped to increase CO₂ absorption capacity, but also shortened the absorbing time. When the mass concentration of ionic liquid was 20 % and the temperature was 25 °C, CO₂ absorption capacity in [TETAH][HCOO]-PEG200 system reached 1.340 mol CO₂/mol IL, and its absorption rate was up to 12.768 mmol CO₂/(mol IL•min). CO₂ absorption in [TETAH][HCOO]-PEG200 system was mainly concentrated in the first 30 min, and CO₂ absorption capacity accounted for about 80 % of the total during this period. The effects of temperature and PEG200 concentration on viscosity of [TETAH][HCOO]-PEG200 were investigated, which indicated that the effect of temperature on viscosity was greater than that of PEG200. Regeneration performance of [TETAH][HCOO]-PEG200 showed that the fifth CO₂ absorption still retained 70.10 % of the original performance.

CO ₂是一种温室气体，对全球变暖做出了很大贡献。离子液体是一种绿色溶剂，在捕获CO _2方面显示出巨大潜力。本研究合成了功能化离子液体[TETAH] [HCOO]，并研究了由[TETAH] [HCOO]和聚乙二醇200（PEG200）组成的混合体系对CO _2的吸收性能。结果表明，[TETAH] [HCOO]和PEG200对CO ₂捕获具有明显的协同作用。PEG200不仅有助于增加CO _2的吸收能力，而且缩短了吸收时间。当离子液体的质量浓度为20％且温度为25°C时，CO ₂在[TETAH] [HCOO] -PEG200系统中的吸收容量达到1.340 mol CO ₂ / mol IL，其吸收率高达12.768 mmol CO ₂ /（mol IL•min）。CO ₂的吸收在[TETAH] [HCOO] -PEG200系统主要集中在第30分钟，和CO ₂的吸收能力，在此期间占总量的约80％。研究了温度和PEG200浓度对[TETAH] [HCOO] -PEG200粘度的影响，表明温度对粘度的影响大于PEG200。[TETAH] [HCOO] -PEG200的再生性能表明，第五次CO ₂吸收仍保持原始性能的70.10％。