Quasi-vertically asymmetric channels of graphene oxide membrane for ultrafast ion sieving

Changdao Han, Jie Jiang, Liuhua Mu, Wenhui Zhao, Junfan Liu, Jian Lan, Shouyuan Hu, Huan Yang, Shan Gao, Feng Zhou, Junlang Chen, Yan Fan, Xiangmei Duan (), Pei Li () and Liang Chen ()
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Changdao Han: Ningbo University
Jie Jiang: Ningbo University
Liuhua Mu: University of Chinese Academy of Sciences
Wenhui Zhao: Ningbo University
Junfan Liu: Zhejiang GuoFu Environmental Technology Co.,Ltd
Jian Lan: Zhejiang GuoFu Environmental Technology Co.,Ltd
Shouyuan Hu: Ningbo University
Huan Yang: Ningbo University
Shan Gao: Ningbo University
Feng Zhou: Zhejiang GuoFu Environmental Technology Co.,Ltd
Junlang Chen: Zhejiang A&F University
Yan Fan: Zhejiang A&F University
Xiangmei Duan: Ningbo University
Pei Li: Ningbo University
Liang Chen: Ningbo University

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract The high performance of two-dimensional (2D) channel membranes is generally achieved by preparing ultrathin or forming short channels with less tortuous transport through self-assembly of small flakes, demonstrating potential for highly efficient water desalination and purification, gas and ion separation, and organic solvent waste treatment. Here, we report the construction of vertical channels in graphene oxide (GO) membrane based on a substrate template with asymmetric pores. The membranes achieved water permeance of 2647 L m−2 h−1 bar−1 while still maintaining an ultrahigh rejection rate of 99.9% for heavy metal ions, which is superior to the state-of-the-art 2D membranes reported. Furthermore, the membranes exhibited excellent stability during long-term filtration experiments for at least 48 h, as well as resistance to ultrasonic treatment for over 100 minutes. The vertical channels possess very short pathway for almost direct water transport and a highly effective channel area, meanwhile the asymmetric porous template enhances the packing of the inserted GO nanosheets to avoid the swelling effect of membrane. Our work provides a simple way to fabricate vertical channels of 2D nanofiltration membranes with high water purification performance.

Date: 2025
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DOI: 10.1038/s41467-025-56358-z

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