A high permeance is corresponding to a low membrane area and a reduced capital investment in the organic solvent nanofiltration (OSN) process. Currently, to increase the permeance, only a few microporous fillers were utilized to prepare the mixed matrix membranes (MMMs). In this study, MCM-41, a typical mesoporous filler, was selected and doped into a polyimide (PI) matrix, aiming to increase the solvent permeance of the MMMs. To break the trade-off between permeance and rejection, a covalent bridge between amine-functionalized MCM-41 (NH₂-MCM-41) and PI was constructed so as to avoid forming the non-selective interfacial voids in the filler-polymer interface. As a result, the water, ethanol and isopropanol permeances of 5 wt% NH₂-MCM-41/PI MMM were increased by 102%, 78% and 131% compared with pure PI membrane, without obvious reductions of rejections. Overall, the NH₂-MCM-41/PI MMM shows its great potential in high-efficiency organic solvent nanofiltration in practical applications.

高渗透率对应于膜面积低和有机溶剂纳米过滤（OSN）工艺中的投资减少。当前，为了增加渗透性，仅使用几种微孔填料来制备混合基质膜（MMM）。在这项研究中，选择了MCM-41（一种典型的中孔填料）并掺入聚酰亚胺（PI）基质中，旨在提高MMM的溶剂渗透性。为了打破渗透和排斥之间的权衡，在胺官能化的MCM-41（NH ₂ -MCM-41）和PI之间建立了共价桥，以避免在填料-聚合物界面中形成非选择性界面空隙。结果，水，乙醇和异丙醇的渗透率为5 wt％NH ₂-MCM-41 / PI MMM与纯PI膜相比增加了102％，78％和131％，而拒绝率却没有明显降低。总体而言，NH ₂ -MCM-41 / PI MMM在实际应用中显示出在高效有机溶剂纳米过滤中的巨大潜力。