Hydrophilic UiO-66 crystals with superior water adsorption ability were synthesized and incorporated into the polyimide (PI) membrane for efficient aprotic solvent separation via pervaporation. The effect of the different UiO-66 addition in the pyromellitic dianhydride (PMDA)-2, 2-bis[4-(4-amlnophenoxy)phenyl]propane (BAPP)-based PI membrane on the membrane structure, thermal stability, surface hydrophilicity, solvent-resistant, and pervaporation performance was systematically studied. The UiO-66/PI hybrid membranes with small amount content (2 wt%) exhibited high hydrophilicity and excellent swelling resistance due to the superb dispersion benefiting from the excellent complexation of UiO-66 and PI chain. The effects of operational variables such as operating temperature and concentration of feed solution on the pervaporation separation performance of the hybrid membranes with different UiO-66 loadings were investigated. When the mass fraction of UiO-66 was 2 wt%, the hybrid membranes show the permeation flux of 109.7 and 57.1 g/(m²h) and separation factor of 34.1 and 133.9, respectively, for DMF/H₂O and DMAc/H₂O systems.

Graphical abstract

合成了具有优异吸水能力的亲水性UiO-66晶体，并将其掺入聚酰亚胺（PI）膜中，以通过全蒸发有效地分离非质子溶剂。均苯四酸二酐（PMDA）-2、2-双[4-（4-氨苯氧基）苯基]丙烷（BAPP）基PI膜中不同UiO-66添加量对膜结构，热稳定性，表面亲水性的影响，耐溶剂性和全蒸发性能得到了系统的研究。少量的UiO-66 / PI杂化膜（含量为2 wt％）显示出高亲水性和出色的抗溶胀性，这归因于UiO-66和PI链的出色配位带来的超强分散性。研究了操作变量（例如操作温度和进料溶液浓度）对具有不同UiO-66负载量的杂化膜的渗透蒸发分离性能的影响。当UiO-66的质量分数为2 wt％时，杂化膜的渗透通量为109.7和57.1 g /（m对于DMF / H ₂ O和DMAc / H ₂ O系统，分离系数分别为² h）和34.1和133.9 。

图形概要