Jin Pengrui, Robeyn Michiel, Zheng Junfeng, Yuan Shushan, Van der Bruggen Bart
Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium.
School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Membranes (Basel). 2020 Sep 24;10(10):251. doi: 10.3390/membranes10100251.
High-performance positively-charged nanofiltration (NF) membranes have a profound significance for water softening. In this work, a novel monomer, tris(3-aminopropyl)amine (TAEA), with one tertiary amine group and three primary amine groups, was blended with trace amounts of piperazine (PIP) in aqueous solution to fabricate a positively-charged NF membrane with tunable performance. As the molecular structures of TAEA and PIP are totally different, the chemical composition and structure of the polyamine selective layer could be tailored via varying the PIP content. The resulting optimal membrane exhibited an excellent water permeability of 10.2 LMH bar and a high rejection of MgCl (92.4%), due to the incorporation of TAEA/PIP. In addition, this TAEA NF membrane has a superior long-term stability. Thus, this work provides a facile way to prepare a positively charged membrane with an efficient water softening ability.
高性能带正电荷的纳滤（NF）膜对水软化具有深远意义。在这项工作中，一种具有一个叔胺基团和三个伯胺基团的新型单体三（3-氨丙基）胺（TAEA）在水溶液中与痕量哌嗪（PIP）混合，以制备性能可调的带正电荷的NF膜。由于TAEA和PIP的分子结构完全不同，可以通过改变PIP含量来调整聚胺选择层的化学组成和结构。所得的最佳膜由于加入了TAEA/PIP，表现出10.2 LMH bar的优异水渗透性和对MgCl的高截留率（92.4%）。此外，这种TAEA NF膜具有优异的长期稳定性。因此，这项工作提供了一种制备具有高效水软化能力的带正电荷膜的简便方法。
