Abstract The synergized optimization of water flux and salt rejection by blending with inorganic fillers has been achieved for the polyamide (PA) thin film nanocomposite (TFN) membrane. However, it is difficult to characterize its mass transport properties due to the very thin and heterogeneous PA film. In this work, we select cellulose triacetate (CTA) as the base to prepare hybrid films and their transport properties were studied according to solution-diffusion theory. A series of inorganic fillers, such as reduced graphene oxide (RGO), zeolites, ZIF-8, SiO 2 and graphene oxide (GO) were incorporated. The SEM and EDX results indicate a less than 1 wt% filler content for a uniform dispersion. The blending of inorganic fillers leads to enhanced glass transition temperature (T g ) and density, little effect on the water transport property but dramatically decreased salt permeability values, which are nearly ten-fold of that of the CTA film. The blending of GO can densify and hydrophilize CTA simultaneously, which is most promising for a desalination application. The increased water uptake should contribute to its increased water permeability, while the decreased free volume size and FFV value and various interactions between the ions (Na + , Cl - ) and GO sheets account for salt permeability decrease.

中文翻译：

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基于三醋酸纤维素的有机/无机杂化薄膜的水/盐传输性能

摘要 聚酰胺（PA）薄膜纳米复合（TFN）膜通过与无机填料共混实现了水通量和脱盐率的协同优化。然而，由于非常薄且异质的 PA 薄膜，很难表征其传质特性。在这项工作中，我们选择三乙酸纤维素 (CTA) 作为基础制备混合薄膜，并根据溶液扩散理论研究了它们的传输性能。加入了一系列无机填料，如还原氧化石墨烯（RGO）、沸石、ZIF-8、SiO 2 和氧化石墨烯（GO）。SEM 和 EDX 结果表明，对于均匀分散体，填料含量低于 1 wt%。无机填料的混合可提高玻璃化转变温度 (T g ) 和密度，对水传输性能的影响很小，但显着降低了盐渗透率值，几乎是 CTA 膜的十倍。GO 的混合可以同时使 CTA 致密化和亲水化，这对于海水淡化应用是最有希望的。增加的吸水率应有助于其增加的水渗透性，而自由体积大小和 FFV 值的减小以及离子（Na + 、Cl - ）和 GO 片之间的各种相互作用导致盐渗透性降低。