Cu(Qc)2强化Pebax混合基质膜分离CO2

为了提高Pebax-1657的CO₂分离性能，本文制备了对CO₂有吸附作用的金属有机骨架Cu(Qc)₂，将其加入到Pebax-1657基质中，制备混合基质膜，用于CO₂的气体分离。通过扫描电子显微镜、热重分析、红外光谱和X射线衍射对溶液浇铸法制备的膜进行表征，通过膜的气体渗透性能测试考察填料含量、操作压力和混合气对膜气体渗透性能的影响。结果表明，Cu(Qc)₂在Pebax基质中随机有效地堆叠形成了高选择性的气体传输通道，极大地提高了CO₂/N₂的选择性。随着Cu(Qc)₂填充量的增加，CO₂渗透系数和CO₂/N₂选择性均呈现先上升后下降的趋势。当Cu(Qc)₂的质量分数为3%时，呈现最佳的CO₂/N₂分离性能，CO₂ 渗透系数和CO₂/N₂选择性分别为102Barrer和84，与Pebax-1657膜相比，分别提高了45.7%和40.0%，突破了Robeson分离上限，表明该混合基质膜在CO₂的分离应用上具有潜力。

CO2 separation of Pebax-based mixed matrix membranes promoted by Cu(Qc)2

In order to improve the CO₂ separation performance of Pebax-1657, a metal-organic framework Cu(Qc)₂ was prepared which could adsorb CO₂ and be introduced into the Pebax-1657 matrix to prepare Pebax/Cu(Qc)₂ mixed matrix membranes for CO₂ gas separation. The films prepared by the solution casting method were characterized by scanning electron microscopy, thermogravimetric analysis, infrared spectroscopy and X-ray diffraction. Through the gas permeability test of the membrane, the effects of filler content, operating pressure and mixed gas on the gas permeability of the membrane were investigated. The results show that the random and effective stacking of the Cu(Qc)₂ in the mixed matrix membranes create highly selective gas transport channels that dramatically enhance CO₂/N₂ selectivity. Both the CO₂ permeability and CO₂/N₂ selectivity show a trend of first increasing and then decreasing with the increase of Cu(Qc)₂ loading. When 3% Cu(Qc)₂ filler is added, the CO₂/N₂ separation performance of the mixed matrix membrane is the best, and the CO₂ permeability coefficient and CO₂/N₂ selectivity are 102 Barrer and 84, respectively. Compared with the pure Pebax-1657 membrane, it has increased by 45.7% and 40.0% respectively, successfully breaking the upper limit of Robeson separation, indicating that the mixed matrix membrane has potential in the application of CO₂ separation.