Duong Phuoc H H, Daumann Kevin, Hong Pei-Ying, Ulbricht Mathias, Nunes Suzana P
Lehrstuhl für Technische Chemie II , Universität Duisburg-Essen , 45117 Essen , Germany.
Langmuir. 2019 Feb 5;35(5):1284-1293. doi: 10.1021/acs.langmuir.8b00960. Epub 2018 Jul 23.
A simple scalable strategy is proposed to fabricate highly permeable antifouling nanofiltration membranes. Membranes with a selective thin polyamide layer were prepared via interfacial polymerization incorporating building blocks of zwitterionic copolymers. The zwitterionic copolymer, poly(aminopropyldimethylaminoethyl methacrylate)- co-poly(sulfobetaine methacrylate) with an average molecular weight of 6.1 kg mol, was synthesized in three steps: (i) polymerization of dimethylaminoethyl methacrylate to yield the base polymer by atom transfer radical polymerization (ATRP), (ii) fractional sulfobetainization via quaternization, and (iii) amination via quaternization. The effect of the zwitterionic polymer content on the polyamide surface characteristics, fouling resistance, and permeance is demonstrated. The zwitterion-modified membrane becomes more hydrophilic with lower surface roughness, as the zwitterionic polymer fraction increases. The excellent fouling resistance of the zwitterion-modified membrane was confirmed by the negligible protein adsorption and low bacteria fouling compared to a pristine membrane without zwitterionic segments. In addition, the zwitterion-modified membranes achieve a water permeation around 135 L m hbar, which is 27-fold higher than that of the pristine membrane, along with good selectivity in the nanofiltration range, confirmed by the rejection of organic dyes. This permeance is about 10 times higher than that of other reported loose nanofiltration membranes with comparable dye rejection. The newly designed membrane is promising as a highly permeable fouling resistant cross-linked polyamide network for various water treatment applications.
提出了一种简单的可扩展策略来制备高渗透性抗污染纳滤膜。通过界面聚合结合两性离子共聚物的结构单元制备了具有选择性聚酰胺薄层的膜。合成了平均分子量为6.1 kg/mol的两性离子共聚物聚（甲基丙烯酸氨丙基二甲基氨基乙酯）- 共 - 聚（甲基丙烯酸磺酸甜菜碱），分三步进行：（i）通过原子转移自由基聚合（ATRP）聚合甲基丙烯酸二甲基氨基乙酯以得到基础聚合物，（ii）通过季铵化进行部分磺酸甜菜碱化，以及（iii）通过季铵化进行胺化。证明了两性离子聚合物含量对聚酰胺表面特性、抗污染性和渗透性的影响。随着两性离子聚合物比例的增加，两性离子改性膜变得更亲水，表面粗糙度更低。与没有两性离子链段的原始膜相比，两性离子改性膜的蛋白质吸附可忽略不计且细菌污染低，从而证实了其优异的抗污染性。此外，两性离子改性膜实现了约135 L m⁻² h⁻¹ bar⁻¹的水渗透通量，比原始膜高27倍，同时在纳滤范围内具有良好的选择性，这通过对有机染料的截留得到证实。该渗透通量比其他报道的具有可比染料截留率的疏松纳滤膜高约10倍。新设计的膜有望成为用于各种水处理应用的高渗透性抗污染交联聚酰胺网络。
