In this study, two types of acidic and basic ionic liquids (ILs) were used to modify the γ-Al₂O₃ particles. Different amounts of modified particles were added to the poly (ether-block-amide) (Pebax) polymeric matrix, and various composite membranes were prepared. FTIR (Fourier transform infrared), SEM (scanning electron microscopy), XRD (X-ray diffraction), DSC (differential scanning calorimetry), tensile and gas permeation analyses, as well as molecular simulations, were used to study the effect of ILs on the structure of membranes and their performances. The results indicated that ILs prevented well the sedimentation and agglomeration of particles through the electrostatic and steric forces. The electrostatic forces were more effective than steric forces. In addition to improving membrane separation performance and overcoming the trade-off limit, the modification of γ-Al₂O₃ particles has improved membranes mechanical strength. The comparison of ILs performances showed that the acidic IL had a better effect on the particle dispersion than the basic one. The CO₂ permeability and CO₂/N₂ selectivity in the membrane containing 10 wt% acidic IL-modified particles increased about 47% and 124%, respectively, compared to the pure Pebax membrane. The molecular simulation confirmed the experimental results and showed that the employed ILs had different effects on the diffusivity and solubility coefficients of CO₂ molecules in the membranes. Based on simulation results, the acidic IL improved the solubility coefficient by 95%, and the basic IL enhanced the diffusivity coefficient by 71%.

在这项研究中，两种类型的酸性和碱性离子液体 (ILs) 用于改性 γ-Al ₂ O ₃粒子。将不同量的改性颗粒加入到聚（醚-嵌段-酰胺）（Pebax）聚合物基质中，制备出各种复合膜。FTIR（傅里叶变换红外）、SEM（扫描电子显微镜）、XRD（X 射线衍射）、DSC（差示扫描量热法）、拉伸和气体渗透分析以及分子模拟被用来研究离子液体对膜的结构及其性能。结果表明，离子液体通过静电力和空间力很好地防止了颗粒的沉降和团聚。静电力比空间力更有效。除了提高膜分离性能和克服权衡限制外，γ-Al ₂ O ₃的改性颗粒具有改进的膜机械强度。离子液体性能的比较表明，酸性离子液体比碱性离子液体对颗粒分散的影响更好。与纯 Pebax 膜相比，含有 10 wt% 酸性 IL 改性颗粒的膜中的 CO ₂渗透率和 CO ₂ /N ₂选择性 分别增加了约 47% 和 124%。分子模拟证实了实验结果，并表明所采用的离子液体对膜中CO ₂分子的扩散系数和溶解度系数有不同的影响。根据模拟结果，酸性离子液体使溶解系数提高了 95%，碱性离子液体使扩散系数提高了 71%。