Zhai Chunlin, Zhang Kunpeng, Liu Yanling, Xia Shengji
State Key Laboratory of Water Pollution Control and Green Resource Recycling, Advanced Membrane Technology Center, Tongji University, Shanghai 200092, China; Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, China.
State Key Laboratory of Water Pollution Control and Green Resource Recycling, Advanced Membrane Technology Center, Tongji University, Shanghai 200092, China; Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, China.
Water Res. 2025 Jul 28;287(Pt A):124315. doi: 10.1016/j.watres.2025.124315.
Highly negatively charged nanofiltration membranes with tailored pore sizes can effectively reject trace per- and polyfluoroalkyl substances (PFAS) while allowing the passage of beneficial mineral ions, making them ideal for advanced drinking water purification. This study proposed a novel dual-component-assisted interfacial polymerization (IP) strategy aiming at enhancing membrane selectivity between PFAS and mineral ions. The step-wise involvement of p-Phenylenediamine as the aqueous co-monomer and 1,3,5-triformyl phloroglucinol as the pre-loading organic phase properly tailored the IP kinetics for polyamide layer formation. This strategy achieved superior effect compared to others adopting single component or mixed organic phase, yielding high-performance membranes characterized by looser structures, higher negative charge density, thinner thickness, and enhanced hydrophilicity. The optimal membrane demonstrated a high water permeance of 20.4 L m h bar, over 88 % rejections for six kinds of PFAS (300-514 Da), and a Ca/PFAS selectivity exceeding 37 when treating practical tap water, surpassing numerous commercial and previously developed membranes. Furthermore, the novel membrane exhibited excellent long-term stability and improved resistance to organic fouling and gypsum scaling. This study presents a promising solution of nanofiltration for drinking water treatment requiring efficient removal of trace PFAS and high preservation of mineral ions.
具有定制孔径的高负电荷纳滤膜可以有效截留痕量全氟和多氟烷基物质（PFAS），同时允许有益的矿物离子通过，使其成为先进饮用水净化的理想选择。本研究提出了一种新型的双组分辅助界面聚合（IP）策略，旨在提高PFAS与矿物离子之间的膜选择性。对苯二胺作为水相共聚单体和1,3,5-三(甲酰基)间苯三酚作为预负载有机相的逐步参与，恰当地调整了聚酰胺层形成的IP动力学。与采用单一组分或混合有机相的其他策略相比，该策略取得了更好的效果，得到了具有更疏松结构、更高负电荷密度、更薄厚度和增强亲水性的高性能膜。最佳膜表现出20.4 L m⁻² h⁻¹ bar⁻¹的高水通量，对六种PFAS（300 - 514 Da）的截留率超过88%，在处理实际自来水时Ca/PFAS选择性超过37，超过了许多商业膜和先前开发的膜。此外，新型膜表现出优异的长期稳定性，并提高了对有机污染和石膏结垢的抗性。本研究为饮用水处理中的纳滤提供了一种有前景的解决方案，该处理需要有效去除痕量PFAS并高度保留矿物离子。
