Here, it was aimed to modify the surface of NF90 with layer by layer (LbL) blended poly(allylamine hydrochloride) (PAH)‐chitosan (CHI) and poly(acrylic acid) (PAA) with/without functionalized multiwalled carbon nanotube (fMWCNT) for reverse‐osmosis applications. Using Quartz Crystal Microbalance Dissipation monitoring, it was observed that PAH‐CHI/PAA LbL films grew linearly after a few bilayers and no LbL film degradation occurred during synthetic seawater treatment. Thermal degradation of all LbL blended membranes was similar. NF90 had a heterogeneous surface while the surface of LbL blend membranes exhibited some agglomerations due to the polyelectrolyte (PE) complex formation and fibrillary appearance depending on the use of fMWCNT. [(PAH50‐CHI50/(PAA‐fMWCNT)]₃₀ indicated the highest flux with 14.5 L m² h⁻¹ at 40 bar. The sodium and chlorine ion rejections were 75% and 87%, respectively, for the same membrane. The use of fMWCNT led to a significant enhancement in flux with a slight decay in ion rejections. On the other hand, chlorine ion rejection of [(PAH50‐CHI50/(PAA‐fMWCNT)]₃₀ decreased by 25% at 40 bar while 60 and 90 bilayers of [(PAH50‐CHI50/(PAA‐fMWCNT)] disintegrated after NaOCl treatment. Briefly, the flux and ion rejections of the LbL blended membranes can be controlled depending on the use of fMWCNT and different PE couples without multilayer decomposition against synthetic seawater. POLYM. ENG. SCI., 60: 341–351, 2019. © 2019 Society of Plastics Engineers

中文翻译：

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聚电解质共混物和多壁碳纳米管的新型表面改性LbL复合膜的制备，表征和分离性能

在此，我们旨在通过（LbL）混合聚（烯丙胺盐酸盐）（PAH）-壳聚糖（CHI）和聚（丙烯酸）（PAA）混合的功能层来修饰NF90的表面，该功能层具有或不具有功能化的多壁碳纳米管（fMWCNT） ）适用于反渗透应用。使用石英晶体微天平耗散监测，观察到PAH‐CHI / PAA LbL膜在经过几层双层后呈线性增长，并且在合成海水处理过程中未发生LbL膜降解。所有LbL共混膜的热降解均相似。NF90具有不均匀的表面，而LbL共混膜的表面由于聚电解质（PE）配合物的形成和原纤维的外观而表现出一些团聚，具体取决于使用fMWCNT的情况。[（PAH50-CHI50 /（PAA-fMWCNT）] ₃₀表示最高通量，为14.5 L m² h ^-1在40巴下。对于同一膜，钠和氯离子的截留率分别为75％和87％。fMWCNT的使用导致通量显着提高，而离子排斥率略有下降。另一方面，[（PAH50-CHI50 /（PAA-fMWCNT）] _30的氯离子截留率在40 bar下降低了25％，而60 [和90]双层的[[PAH50-CHI50 /（PAA-fMWCNT）]的NaOCl分解则消失了简而言之，LbL混合膜的通量和离子截留可以根据fMWCNT和不同PE对的使用来控制，而无需针对合成海水进行多层分解。POLYM。ENG。SCI。，60：341-351，2019.© 2019年塑料工程师学会