The traditional 2D nanosheets, given its relatively large size, has obstacles in water transmission and may also cause non-selective defects in polyamide membranes. To account for size effects, we successfully synthesized MXene quantum dots (MQDs) with ultra-small size through simple hydrothermal reaction, which were then utilized to construct MQDs polyamide nanofiltration membranes. Compared to the blank membrane, the MQDs membranes prepared obtained remarkable improvements in permeance and salt rejection, achieving a water permeance of 16.3 Lmhbar and NaSO rejection of 98.2%. Furthermore, MQDs membranes demonstrate exceptional antifouling properties and long-term performance stability. Molecular simulation reveals that the incorporation of MQDs effectively restricts the diffusion of piperazine (PIP) into the organic phase, thereby forming a loose membrane structure. Simulation of the transport process confirms that the loose membrane structure is more conducive to water transport, and exhibits reduced contact force between bovine serum albumin (BSA) pollutants and the surface of MQDs membranes. This work sheds light on high-performance nanofiltration via MQDs-regulated interfacial polymerization strategy.

中文翻译：

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具有小尺寸 MXene 量子点的聚酰胺纳滤膜的定制设计，用于促进水传输

传统的二维纳米片由于尺寸较大，在水传输方面存在障碍，也可能导致聚酰胺膜的非选择性缺陷。为了解决尺寸效应，我们通过简单的水热反应成功合成了超小尺寸的MXene量子点（MQD），然后将其用于构建MQD聚酰胺纳滤膜。与空白膜相比，所制备的MQDs膜在渗透性和脱盐率方面获得了显着改善，实现了16.3 Lmhbar的水渗透性和98.2%的NaSO脱除率。此外，MQD 膜还表现出卓越的防污性能和长期性能稳定性。分子模拟表明，MQD的掺入有效限制了哌嗪（PIP）扩散到有机相中，从而形成松散的膜结构。传输过程的模拟证实，松散的膜结构更有利于水的传输，并且牛血清白蛋白（BSA）污染物与MQD膜表面之间的接触力减小。这项工作揭示了通过 MQD 调节的界面聚合策略实现高性能纳滤。