Poly (ionic liquid)s attracted enormous attention as adsorbents for the CO₂ separation from natural gas. Hence, in this work poly (1-butyl-3-vinylimidazolium bromide), P[VBIm][Br], poly (1-butyl-3-vinylimidazolium thiocyanate), P[VBIm][SCN], and poly (1-butyl-3-vinylimidazolium tetrafluoroborate), P[VBIm][BF₄] were synthesized and evaluated their CO₂ adsorption performance. The synthesized poly(ionic liquid)s were characterized by ¹H NMR, FT-IR spectroscopy, and differential scanning calorimetery (DSC) analysis. The CO₂ adsorption was studied at various temperatures and pressures by quartz crystal microbalance (QCM) and experimental data were correlated by a model of dual-mode. The Henry and Langmuir contributions in CO₂ adsorption were evaluated. The obtained thermodynamics and kinetics parameters of CO₂ adsorption reveal that CO₂ adsorption has an exothermic and physisorption nature. Also, density functional theory (DFT) computations were done in order to assess interactions between poly(ionic liquid)s with CO₂ gas. DFT computations corroborated that interaction of P[VBIm][SCN] with CO2 is stronger than those of other poly(ionic liquid)s.

聚（离子液体）作为从天然气中分离CO _{2 的}吸附剂引起了极大的关注。因此，在这项工作中，聚（1-丁基-3-乙烯基咪唑溴化物）、P[VBIm][Br]、聚（1-丁基-3-乙烯基咪唑硫氰酸盐）、P[VBIm][SCN] 和聚（1-丁基-3-乙烯基咪唑鎓四氟硼酸盐）、P[VBIm][BF ₄ ] 被合成并评估了它们的CO ₂吸附性能。合成的聚（离子液体）通过¹ H NMR、FT-IR 光谱和差示扫描量热（DSC）分析表征。二氧化碳₂通过石英晶体微量天平（QCM）研究了不同温度和压力下的吸附，并通过双模式模型关联了实验数据。评估了亨利和朗缪尔对 CO ₂吸附的贡献。获得的CO ₂吸附热力学和动力学参数表明CO ₂吸附具有放热和物理吸附性质。此外，还进行了密度泛函理论 (DFT) 计算以评估聚（离子液体）与 CO ₂气体之间的相互作用。DFT 计算证实 P[VBIm][SCN] 与 CO2 的相互作用强于其他聚（离子液体）的相互作用。