The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China.
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, Jiangsu 211816, People's Republic of China.
Nano Lett. 2021 Oct 13;21(19):8236-8243. doi: 10.1021/acs.nanolett.1c02683. Epub 2021 Oct 1.
Graphene oxide (GO) is receiving tremendous attention in membrane separation; however, its desalination performances remain suboptimal because of excessive swelling and tortuous transport pathways. Herein, we chemically joint GO nanosheets and phenolic nanomeshes together to form laminated membranes comprising through-plane nanopores and stabilized nanochannels. GO and phenolic/polyether nanosheets are mixed to form stacked structures and then treated in HSO to remove polyether to produce nanomeshes and to chemically joint GO with phenolic nanomeshes. Thus-synthesized laminated membranes possess enhanced interlayer interactions and narrowed interlayer spacings down to 6.4 Å. They exhibit water permeance up to 165.6 L/(m h bar) and NaSO rejection of 97%, outperforming most GO-based membranes reported so far. Moreover, the membranes are exceptionally stable in water because the chemically jointed laminates suppress the swelling of GO. This work reports hybrid laminated structures of GO and phenolic nanomeshes, which are highly desired in desalination and other applications.
氧化石墨烯（GO）在膜分离领域备受关注；然而，由于过度溶胀和曲折的传输途径，其脱盐性能仍不理想。在此，我们通过化学方法将 GO 纳米片与酚醛纳米网结合在一起，形成了具有贯穿平面纳米孔和稳定纳米通道的层压膜。GO 和酚醛/聚醚纳米片混合形成堆叠结构，然后在 HSO 中处理以去除聚醚，从而生成纳米网并将 GO 与酚醛纳米网化学结合。合成的层压膜具有增强的层间相互作用和缩小至 6.4 Å 的层间间距。它们的水通量高达 165.6 L/（m h bar），对 NaSO 的截留率为 97%，超过了迄今为止报道的大多数基于 GO 的膜。此外，由于化学结合的层压结构抑制了 GO 的溶胀，因此该膜在水中具有出色的稳定性。这项工作报道了 GO 和酚醛纳米网的混合层压结构，这在脱盐和其他应用中是非常需要的。
