石墨烯
氧化物
材料科学
纳米孔
膜
离子
纳米孔
纳米材料
离子键合
选择性
化学工程
纳米技术
化学
冶金
有机化学
生物化学
工程类
催化作用
作者
Yibin Wei,Željko Pastuović,Chao Shen,Timothy D. Murphy,Damian B. Gore
出处
期刊:Carbon
[Elsevier]
日期:2020-03-01
卷期号:158: 598-606
被引量:18
标识
DOI:10.1016/j.carbon.2019.11.031
摘要
Graphene oxide (GO) membranes with precisely controlled nanopores are promising for selectively ionic separation. Here, an ion beam was used to efficiently and simply post-modify GO membranes, creating nanopores in a controllable manner. We compared the influence of GO membrane thickness and ion fluence on the GO structure and the consequent mono-/di-valent metal ion separation performance. Experimental results indicate all GO membranes exhibited improved K+ selectivity with respect to other ions after ion beam irradiation. Moreover, the K+ ion permeability of the optimal membranes is up to 1.4 × 10−3 mol m−2 h−1 and the membrane shows extremely high K+ separation factor to di-valent ions. Remarkably, this method could be used as an in-situ post-treatment for pre-assembled GO membranes. We believe that this strategy offers novel insights into fabricating nanoporous membranes constructed by two-dimensional nanomaterials for a variety of fields including energy, desalination and biomedical applications.
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