Abstract Graphene oxide quantum dots (GOQDs), which inherit the monolayer of sp2 carbon atoms structure and hydrophilic groups as graphene oxide (GO) sheets, but with a quantum lateral size less than 100 nm, may hold great promise in membrane preparation. In this study, a novel nanocomposite membrane by mixing GOQDs with sodium alginate (SA) matrix was prepared for ethanol dehydration. GOQDs with an average lateral dimension around 3.9 nm provided additional shorter and less tortuous transport pathways for water molecules to penetrate the membrane compared to microsized GO sheets. Benefiting from the nanosize and high hydrophilicity of GOQDs, the nanocomposite membrane exhibited favorable ethanol dehydration performance with a total permeation flux of 2432 ± 58 g m−2 h−1, which was 60% higher than that of pristine alginate membrane, and a separation factor of 1152 ± 48. Incorporating GOQDs into the membranes can be an effective approach to improving the water permeation for water-permselective pervaporation membranes.

中文翻译：

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氧化石墨烯量子点掺入具有高水通量的纳米复合膜用于渗透蒸发脱水

摘要 氧化石墨烯量子点 (GOQDs) 继承了单层 sp2 碳原子结构和亲水基团作为氧化石墨烯 (GO) 薄片，但量子横向尺寸小于 100 nm，可能在膜制备中具有广阔的前景。在这项研究中，通过将 GOQD 与海藻酸钠 (SA) 基质混合制备了一种用于乙醇脱水的新型纳米复合膜。与微型 GO 片相比，平均横向尺寸约为 3.9 nm 的 GOQD 为水分子穿透膜提供了额外的更短、更曲折的传输途径。受益于GOQDs的纳米尺寸和高亲水性，纳米复合膜表现出良好的乙醇脱水性能，总渗透通量为2432±58 g m-2 h-1，比原始海藻酸盐膜高60%，