Polyamide-PVA-polyamine COF composite membrane and preparation method thereof

The invention provides a polyamide-PVA-polyamine COF composite membrane and a preparation method thereof, and belongs to the technical field of membrane separation. The polyamide-PVA-polyamine COF composite membrane provided by the invention comprises a polyamide COF membrane and a polyamine COF membrane, and the polyamide COF membrane is bonded with the polyamine COF membrane through PVA. The main body of the polyamide-PVA-polyamine COF composite membrane provided by the invention is composed of a crystalline porous polymer-covalent organic framework (COF) with an ordered pore structure, the elements are connected with each other through amido bonds, and the COF composite membrane shows high separation precision due to rich and highly ordered pores inside. 本发明提供了一种聚酰胺-PVA-聚胺COF复合膜及其制备方法，属于膜分离技术领域。本发明提供的聚酰胺-PVA-聚胺COF复合膜，包括聚酰胺COF膜和聚胺COF膜，所述聚酰胺COF膜通过PVA与所述聚胺COF膜黏结。本发明提供的聚酰胺-PVA-聚胺COF复合膜的主体是由一种具有有序孔结构的结晶性多孔聚合物-共价有机框架(COF)组成，基元间彼此以酰胺键相连，内部丰富且高度有序的孔道使得COF复合膜表现出高的分离精度。