Low MWCO nanofiltration membranes prepared by stepwise depositing polyphenol and aminosilane coupling agent with the assistance of ethanol-regulated oxidation for antibiotic removal

作     者：Runkai Su Guoying Feng Zhiguo Yan Man Xu Cunwen Wang Yanbo Li 

作者机构：Hubei Key Laboratory of Novel Reactor and Green Chemical Technology Key Laboratory for Green Chemical Process of Ministry of Education State Key Laboratory of Green and Efficient Development of Phosphorus Resources School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan 430072 China School of Mechanical & Electrical Engineering Wuhan Institute of Technology China Engineering Research Center of Environmental Materials and Membrane Technology of Hubei Province Wuhan Hubei China 

出 版 物：《Separation and Purification Technology》 (Sep. Purif. Technol.)

年 卷 期：2025年第376卷

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：Ministry of Education, MOE, (LCX202401) Ministry of Education, MOE 

主　　题：Aminosilane coupling agent Ethanol-regulated oxidation Low MWCO Nanofiltration membranes Polyphenols 

摘      要：Mussel-inspired catechol amine chemistry has emerged as a novel strategy to fabricate nanofiltration (NF) membranes. However, the preparation takes hours, and the molecular weight cut-off (MWCO) of the resulting membranes is usually not low enough to reject small molecules. This work described a new method to prepare dense NF membranes using tannic acid (TA) and aminosilane coupling agent (KH792 (N-(2-aminoethyl)-3-aminopropyltrimethoxysilane)) as materials, with the assistance of ethanol-regulated oxidation. The NF membranes were made by stepwise depositing oxidized-TA and KH792 on PSF substrates. The oxidation of TA was regulated by adjusting the solvent composition or the dosage of NaIO 4 . The effect of NaIO 4 on the chemistry of TA was explored by various characterizations. The selective layer of an NF membrane, with a flux of 26.7 L·m −2 ·h −1 ·bar −1 and a MWCO of 200 Da, formed only within 10 min. The membrane had high rejections of naproxen, bezafibrate, and ibuprofen (90 %), and the rejection of NaCl was lower than 20 %, exhibiting a good selectivity for antibiotics toward monovalent ions. Compared with literature-reported mussel-inspired membranes, the proposed method resulted in a membrane with much higher permeance and a lower MWCO, indicating the improvement and advantages among the mussel-inspired methods for the synthesis of NF membranes.