Abstract Lamellar membranes are promising for highly selective permeation, among which graphene-based ones are widely studied. However, graphene-based membranes give limited molecule permeance due to the unfavorable microenvironments of nanochannels, mainly single chemical affinity and narrow channel size. Herein, quantum dots (QDs) were introduced into nanochannels to manipulate the microenvironments for optimized performance. Particularly, hydrophobic graphene quantum dots were anchored in hydrophilic graphene oxide nanochannels to improve the affinity towards nonpolar molecules and locally enlarge the channel size from 0.84 to 1.35 nm. The pleasant affinity facilitates rapid dissolution and entry of molecules into nanochannels, and the enlarged channel size promotes their fast transport. This synergistic effect permits remarkably enhanced permeance for both polar and nonpolar molecules, especially for nonpolar ones. Meanwhile, the narrow distance at QD-free area effectively rejects dyes larger than 2.0 nm. Additionally, the strong covalent bonds between QDs and adjacent nanosheets bring superior stability for membranes.

中文翻译：

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通过量子点操纵层状膜中纳米通道的微环境以提高纳滤性能

摘要 层状膜有望用于高选择性渗透，其中石墨烯基膜被广泛研究。然而，由于纳米通道不利的微环境，主要是单一的化学亲和力和狭窄的通道尺寸，石墨烯基膜的分子渗透性有限。在此，量子点 (QD) 被引入纳米通道以操纵微环境以优化性能。特别是，疏水性石墨烯量子点锚定在亲水性氧化石墨烯纳米通道中，以提高对非极性分子的亲和力，并将通道尺寸局部从 0.84 nm 扩大到 1.35 nm。令人愉快的亲和力促进了分子快速溶解和进入纳米通道，而扩大的通道尺寸促进了它们的快速运输。这种协同效应显着提高了极性和非极性分子的渗透性，尤其是非极性分子。同时，无 QD 区域的狭窄距离有效地拒绝了大于 2.0 nm 的染料。此外，量子点和相邻纳米片之间的强共价键为膜带来了卓越的稳定性。