膜
化学
氧化物
石墨烯
过滤(数学)
金属
层状结构
铝
化学工程
水处理
纳米技术
有机化学
材料科学
环境工程
结晶学
生物化学
统计
工程类
数学
作者
Che Ning Yeh,Kalyan Raidongia,Jiao‐Jing Shao,Quankui Yang,Jiaxing Huang
出处
期刊:Nature Chemistry
[Springer Nature]
日期:2015-01-05
卷期号:7 (2): 166-170
被引量:782
摘要
Graphene oxide (GO) films are known to be highly stable in water and this property has made their use in membrane applications in solution possible. However, this state of affairs is somewhat counterintuitive because GO sheets become negatively charged on hydration and the membrane should disintegrate owing to electrostatic repulsion. We have now discovered a long-overlooked reason behind this apparent contradiction. Our findings show that neat GO membranes do, indeed, readily disintegrate in water, but the films become stable if they are crosslinked by multivalent cationic metal contaminants. Such metal contaminants can be introduced unintentionally during the synthesis and processing of GO, most notably on filtration with anodized aluminium oxide filter discs that corrode to release significant amounts of aluminium ions. This finding has wide implications in interpreting the processing-structure-property relationships of GO and other lamellar membranes. We also discuss strategies to avoid and mitigate metal contamination and demonstrate that this effect can be exploited to synthesize new membrane materials.
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