Zhang Wenbin, Shi Mengqi, Heng Zhongxuan, Zhang Weiming, Pan Bingcai
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Road, Nanjing 210023, P.R. China.
Research Center for Environmental Nanotechnology (ReCENT), Nanjing University, 163 Xianlin Road, Nanjing 210023, P.R. China.
Nano Lett. 2020 Oct 14;20(10):7327-7332. doi: 10.1021/acs.nanolett.0c02724. Epub 2020 Sep 14.
The intercalation strategy is successfully applied in tuning the interlayer distance of 2D membranes for efficient desalination and ion sieving. However, it is difficult to pursue a intercalant that is few nanometers in size and suitable for further chemical modification . Here, for the first time, we report the intercalation of soft particles-polyacrylonitrile gel particles (PAN GPs) inside the graphene oxide (GO) membranes, which allows for a tunable interlayer distance via the deformation of soft particles. Furthermore, the base-induced hydrophobic/hydrophilic structure of PAN GPs facilitates the water diffusion through the GO membrane. A fast and selective water permeation was observed through separation Cu-EDTAfrom water, with the permeance of 4-13 times higher than the reported 2D membranes. Intercalation of soft particles represents a promising strategy to fabricate high-performance 2D membranes.
插层策略已成功应用于调节二维膜的层间距，以实现高效脱盐和离子筛分。然而，很难找到一种尺寸为几纳米且适合进一步化学修饰的插层剂。在此，我们首次报道了在氧化石墨烯（GO）膜内部插入软颗粒——聚丙烯腈凝胶颗粒（PAN GP），这使得通过软颗粒的变形来调节层间距成为可能。此外，PAN GP的碱诱导疏水/亲水结构促进了水通过GO膜的扩散。通过从水中分离铜 - 乙二胺四乙酸（Cu - EDTA），观察到了快速且选择性的水渗透，其渗透率比已报道的二维膜高4 - 13倍。插入软颗粒是制备高性能二维膜的一种有前景的策略。
