Selective Ion Penetration of Graphene Oxide Membranes

The selective ion penetration and water purification properties of freestanding graphene oxide (GO) membranes are demonstrated. Sodium salts permeated through GO membranes quickly, whereas heavy-metal salts infiltrated much more slowly. Interestingly, copper salts were entirely blocked by GO membran...

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Bibliographic Details
Published in:ACS nano Vol. 7; no. 1; pp. 428 - 437
Main Authors: Sun, Pengzhan, Zhu, Miao, Wang, Kunlin, Zhong, Minlin, Wei, Jinquan, Wu, Dehai, Xu, Zhiping, Zhu, Hongwei
Format: Journal Article
Language:English
Published: United States American Chemical Society 22.01.2013
Subjects:
Contaminants
Copper
Graphene
Graphite - chemistry
Ions
Materials Testing
Membranes
Membranes, Artificial
Nanostructure
Nanostructures - chemistry
Nanostructures - ultrastructure
Osmotic Pressure
Oxides
Oxides - chemistry
Particle Size
Penetration
Perfusion
Porosity
Salts - chemistry
Salts - isolation & purification
Sodium salts
Ultrafiltration - methods
Water - chemistry
Water purification
Water Purification - methods
ion penetration
graphene oxides
water treatment
ISSN:1936-0851, 1936-086X, 1936-086X
Online Access:Get full text
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Summary:The selective ion penetration and water purification properties of freestanding graphene oxide (GO) membranes are demonstrated. Sodium salts permeated through GO membranes quickly, whereas heavy-metal salts infiltrated much more slowly. Interestingly, copper salts were entirely blocked by GO membranes, and organic contaminants also did not infiltrate. The mechanism of the selective ion-penetration properties of the GO membranes is discussed. The nanocapillaries formed within the membranes were responsible for the permeation of metal ions, whereas the coordination between heavy-metal ions with the GO membranes restricted the passage of the ions. Finally, the penetration processes of hybrid aqueous solutions were investigated; the results revealed that sodium salts can be separated effectively from copper salts and organic contaminants. The presented results demonstrate the potential applications of GO in areas such as barrier separation and water purification.
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ISSN:1936-0851
1936-086X
1936-086X
DOI:10.1021/nn304471w