文献类型：期刊文献

英文题名：Polyamide nanofiltration membrane modified with defective covalent organic framework interlayer for selective ion sieving

作者：Fang, Yin-Xin[1];Xu, Zhen-Liang[1,3];Xu, Sun-Jie[2,3]

机构：[1]East China Univ Sci & Technol, Chem Engn Res Ctr, Sch Chem Engn, State Key Lab Chem Engn,Membrane Sci & Engn R&D La, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Elect Chem Innovat Inst, Shanghai 200237, Peoples R China

年份：2025

卷号：355

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20243817061760);WOS:【SCI-EXPANDED(收录号:WOS:001319137900001)】；

基金：The authors gratefully acknowledge the National Key R & D Program of China (2021YFB3801103 and 2021YFB3801101) , the financial sup-port from the National Natural Science Foundation of China (22078092, 22078088 and 22208101) , and the research funding provided by the Fundamental Research Funds for the Central Universities (JKA01241502) .

语种：英文

外文关键词：Covalent organic frameworks; Nanofiltration; Interlayer; Size sieving; Mono/divalent ions separation

摘要：Generally, thin-film composite (TFC) membranes prepared using piperazine (PIP) and trimesoyl chloride (TMC) exhibit good Na2SO4 rejection, but their MgCl2 rejection is not satisfactory. In this study, a defective covalent organic framework (COF) interlayer with residual unreacted amine groups was fabricated via interfacial polymerization (IP) by changing the catalyst concentration. Introduction of the COF layer into a polyamide (PA) separation membrane modified the pore size of the PA layer, thereby improving the rejection of divalent cations. The pore size of the PA layer decreased and the surface morphology of the membrane was converted from nodular to a hybrid morphology of "ridge-and-valleys'' and nodules, indicating that the residual unreacted amine groups on the COF interlayer successfully reacted with the acyl chloride groups. The optimal membrane (PIP/COF-A/PES) exhibited high rejection of divalent ions (Na2SO4 of 98.3% and MgCl2 of 94.3%), and the membrane showed excellent capability for separating mono/divalent ions. Overall, a method of preparing nanofiltration membranes by modifying the PA layer to enhance the rejection of divalent cations was demonstrated.