Guan Kecheng, Mai Zhaohuan, Zhou Siyu, Fang Shang, Li Zhan, Xu Ping, Chiao Yu-Hsuan, Hu Mengyang, Zhang Pengfei, Xu Guorong, Nakagawa Keizo, Matsuyama Hideto
Research Center for Membrane and Film Technology, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan.
Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan.
Nano Lett. 2023 Jul 12;23(13):6095-6101. doi: 10.1021/acs.nanolett.3c01541. Epub 2023 Jun 28.
Subnanometer interlayer space in graphene oxide (GO) laminates is desirable for use as permselective membrane nanochannels. Although the facile modification of the local structure of GO enables various nanochannel functionalizations, precisely controlling nanochannel space is still a challenge, and the roles of confined nanochannel chemistry in selective water/ion separation have not been clearly defined. In this study, macrocyclic molecules with consistent basal plane but varying side groups were used to conjunct with GO for modified nanochannels in laminates. We demonstrated the side-group dependence of both the angstrom-precision tunability for channel free space and the energy barrier setting for ion transport, which challenges the permeability-selectivity trade-off with a slightly decreased permeance from 1.1 to 0.9 L m h bar but an increased salt rejection from 85% to 95%. This study provides insights into the functional-group-dependent intercalation modifications of GO laminates for understanding laminate structural control and nanochannel design.
氧化石墨烯（GO）层压板中的亚纳米层间空间有望用作选择性渗透膜纳米通道。尽管对GO局部结构的简便修饰能够实现各种纳米通道功能化，但精确控制纳米通道空间仍然是一个挑战，并且受限纳米通道化学在选择性水/离子分离中的作用尚未明确界定。在本研究中，具有一致基面但侧基不同的大环分子被用于与GO结合，以制备层压板中的改性纳米通道。我们证明了通道自由空间的埃级精度可调性和离子传输能垒设置对侧基的依赖性，这挑战了渗透率-选择性权衡，渗透率略有下降，从1.1降至0.9 L m⁻² h⁻¹ bar，但盐截留率从85%提高到95%。本研究为理解层压板结构控制和纳米通道设计提供了关于GO层压板官能团依赖性插层修饰的见解。
