编号：CDUT-2024-19

标题：Nanofiltration membrane based on a dual-reinforcement strategy of support and selective layers for efficient Mg2+/Li+ separation

入藏号：WOS: 001102317000001

中国科学院文献情报中心期刊分区： 工程技术类1区/TOP（2023）

本校作者：王宏山; 曾广勇*; 杨朝美; 陈曦; 王露单; 向原；曾向东; 于旭东*; 曾英*

来源出版物：SEPARATION AND PURIFICATION TECHNOLOGY卷: 330  文献号: 125254

出版年：2024

第一地址： 成都理工大学

关键词：MXene nanosheets; Crown ether; Interfacial polymerization; Nanofiltration membrane; Mg2+/Li+ separation

代表图：

摘要：With the consumption of lithium resources increasing year by year, the investigation of high-performance salt lake lithium extraction technology is extremely important. In order to effectively separate Mg2+ and Li + from brine, a novel charge-positive nanofiltration (NF) membrane with high permeability and excellent Mg2+/Li+ separation factor was designed by interfacial polymerization (IP) in this work. A B15C5-MX-NF membrane was fabricated by blending hydrophilic two-dimensional (2D) MXene nanosheets into a PES membrane substrate to enhance the permeability, followed by the modification of polyamide (PA) layer with a crown ether molecule (Benzo-15-crown-5) to optimize the surface properties of membrane. The PA layer thickness was effectively reduced (58 nm) due to the enhancement in the interaction between the substrate membrane and PEI by the incorporation of MXene, while the addition of B15C5 provided additional Li + permeation channels. The B15C5- MX-NF membrane exhibited excellent permeability (16.1 L⋅m−2⋅h−1⋅bar−1) and superior selectivity for Mg2+/Li + (SLi, Mg of 15.8) under the dual optimization of membrane substrate and PA layer. In addition, it was demonstrated by molecular dynamics (MD) simulations that the B15C5 molecules in the B15C5-MX-NF membranes had a specific recognition ability of Li + to allow its preferential permeation, thereby enhancing the Mg2+/Li+ selectivity of the membranes. This study provides a new idea for the preparation of NF membranes for efficient Mg2+/Li + separation.

文章链接地址:https://www.sciencedirect.com/science/article/pii/S1383586623021627?via%3Dihub