文献类型：期刊文献

英文题名："Ion-Cage" Structure Of Graphene Oxide Membranes with Stable Interlayer Spacings Towards Efficient Desalination

作者：Wang, Shuai[1]; Yi, Ruobing[2]; Huang, Yi[3]; Zuo, Haoran[4]; Zhang, Yangtian[5]; Chen, Liang[6]; Liang, Shanshan[1]

机构：[1] School of Physics, East China University of Science and Technology, Shanghai, 200237, China; [2] MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi’an, 710049, China; [3] College of Opto-Mechanical Engineering, Zhejiang A&F University, Hangzhou, 311300, China; [4] Oil and Gas Applied Chemistry Key Laboratory of Sichuan Province, School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, China; [5] College of Environment and Resources, College of Carbon Neutral, Zhejiang A&F University, Hangzhou, 311300, China; [6] School of Physical Science and Technology, Ningbo University, Ningbo, 315211, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230317367)

语种：英文

外文关键词：Desalination - Electrostatics - Graphene - Membranes - Microfiltration - Water filtration

摘要：Multilayered graphene oxide (GO) membrane with sub-nanometer channels is an ideal candidate for desalination. However, the exclusion of small ions using GO-based membranes in pressured filtration process remains a great challenge due to the tortuous transport paths of laminates and their water-swelling characteristics. In our previous work, we developed the cation-controlled theory to precisely control the interlayer spacing of GO membranes in aqueous solutions. Herein, an "ion cage" strategy was further proposed to enhance the stability (anti-swelling) of the K-controlled GO (denoted as icGO-K) membrane for efficient desalination. The upper and lower surfaces of the as-fabricated icGO-K membrane were coated by positively charged polymer PEI, and the intercalated cation K+ was immobilized in the laminates by electrostatic repulsion to maintain the stability of the confined interlayer spacing structure. The icGO-K membrane offered superior rejection of different salt ions while maintaining competitive permeance in the desalination process. More importantly, the icGO-K membrane showed ultra-long desalination stability of 720 h. The enhancement performance can be attributed to the synergistic effect of the confined interlayer spacing and surface electrostatic interaction. Overall, this work offers an interesting insight into achieving the fine-tuning 2D laminate nanochannel for high efficiency of desalination application. ? 2023, The Authors. All rights reserved.