文献类型：期刊文献

英文题名：How Does Alkali Etching Work on the Polyamide Membrane to Obtain an m-Phenylenediamine-Based NF Membrane?

作者：Li, Lan-Qian[1];Liu, Xu-Hong[2];Tang, Yong-Jian[1];Xu, Zhen-Liang[1]

机构：[1]East China Univ Sci & Technol, Chem Engn Res Ctr, State Key Lab Chem Engn, Sch Chem Engn,Membrane Sci & Engn R&D Lab, Shanghai 200237, Peoples R China;[2]Shanghai Sep Bio Technol & Engn Co Ltd, Shanghai 200949, Peoples R China

年份：2022

卷号：61

期号：16

起止页码：5536

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20221712036830);WOS:【SCI-EXPANDED(收录号:WOS:000812075100001)】；

基金：Financial support was provided by the National Natural Science Foundation of China (Grant No. 21808060).

语种：英文

外文关键词：Aromatic compounds - Sodium hydroxide - Etching - Chemical stability - Membranes

摘要：Fully aromatic polyamide (PA) membranes have been studied as nanofiltration (NF) membranes for decades because of their good chemical stability, but most of the membranes suffered from poor permeability and high rejection for monovalent ions. In this paper, an m-phenylenediamine (MPD)-based NF membrane was prepared by alkali activation on a reverse osmosis (RO) membrane. Characterization revealed the different etching paths on RO membranes fabricated by different concentrations of monomers of interfacial polymerization. The looser PA layer of RO membrane fabricated by lower-concentration monomers was easily invaded by NaOH molecules because of the higher molecular weight cutoff of 254 Da, which resulted in the transformation of separation grade from RO to NF. At the same time, the MPD-based NF membrane exhibited superior water permeability and pH resistance compared with a PIP-based membrane, which showed a potential to realize large-scale application in practical industry settings. It also provided a facile method for the preparation of a high-performance NF membrane with good chemical stability.