Zheng Zhihao, Xiao Pang, Ruan Huimin, Liao Junbin, Gao Congjie, Van der Bruggen Bart, Shen Jiangnan
Center for Membrane Separation and Water Science & Technology, Ocean College, Zhejiang University of Technology, Hangzhou 310014, China.
Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium.
Membranes (Basel). 2019 Mar 6;9(3):36. doi: 10.3390/membranes9030036.
A facile membrane surface modification process for improving permselectivity and antimicrobial property was proposed. A polydopamine (PDA) coating was firstly fabricated on pristine anion exchange membrane (AEM), followed by in situ reduction of Ag without adding any extra reductant. Finally, 2,5-diaminobenzene sulfonic acid (DSA) was grafted onto PDA layer via Michael addition reaction. The as-prepared AEM exhibited improved permselectivity (from 0.60 to 1.43) and effective inhibition of bacterial growth. In addition, the result of the long-term (90-h continuous electrodialysis) test expressed the excellent durability of the modified layer on membrane surface, because the concentration of Cl and SO₄² in diluted chamber fluctuated ~0.024 and 0.030 mol·L with no distinct decline. The method described in this work makes the full use of multifunctional PDA layer (polymer-like coating, in situ reduction and post-organic reaction), and a rational design of functional AEM was established for better practical application.
提出了一种用于提高渗透选择性和抗菌性能的简便膜表面改性工艺。首先在原始阴离子交换膜（AEM）上制备聚多巴胺（PDA）涂层，然后在不添加任何额外还原剂的情况下原位还原银。最后，通过迈克尔加成反应将2,5-二氨基苯磺酸（DSA）接枝到PDA层上。所制备的AEM表现出改善的渗透选择性（从0.60提高到1.43）和对细菌生长的有效抑制。此外，长期（90小时连续电渗析）测试结果表明膜表面改性层具有优异的耐久性，因为稀释室中Cl⁻和SO₄²⁻的浓度波动约为0.024和0.030 mol·L⁻¹，且没有明显下降。这项工作中描述的方法充分利用了多功能PDA层（类聚合物涂层、原位还原和后有机反应），并建立了功能性AEM的合理设计以实现更好的实际应用。
