Forward osmosis (FO), as an emerging energy-saving membrane processes, is highly promising to solve the water-shortage problem. Herein, a series of novel carbo polyetherketone (PEK-C)-based FO membranes are prepared via layer-by-layer (LBL) self-assembly by using polyethyleneimine (PEI) as the positive layer and carbon quantum dots (CQDs) as the negative layer. By tuning the number of self-assembly layers, the characteristics of outermost electrolyte, and the concentration of CQDs solution used for self-assembly, the performance of the PEK-C-based FO membranes can be optimized. The resulting membrane, [PEI/CQDs]₂PEI, exhibits best performance with a water flux of 30.8 LMH and a reverse salt flux of 8.9 GMH, respectively, outperforming most of current FO membranes. Such high performance is attributed to the presence of CQDs, which endows the membrane with more hydrophilic surface. Furthermore, the membrane presents excellent long-term stability and anti-fouling property owing to the smoother surface that results from the LBL method. Our work could provide some reference for the design of high performance membrane.

正渗透（FO），作为一种新兴的节能膜工艺，在解决缺水问题上很有前途。本文以聚乙烯亚胺（PEI）为正极层，以碳量子点（CQDs）为载体，通过层层（LBL）自组装制备了一系列新型的基于碳聚醚酮（PEK-C）的FO膜。负层。通过调整自组装层的数量，最外层电解质的特性以及用于自组装的CQDs溶液的浓度，可以优化基于PEK-C的FO膜的性能。所得膜[PEI / CQDs] ₂PEI表现出最佳性能，水通量为30.8 LMH，反盐通量为8.9 GMH，胜过大多数目前的FO膜。如此高的性能归因于CQD的存在，它使膜具有更亲水的表面。此外，由于LBL方法产生的表面更光滑，因此该膜具有出色的长期稳定性和防污性能。我们的工作可以为高性能膜的设计提供参考。