Effective and sustainable Cs+ remediation via exchangeable sodium-ion sites in graphene oxide fibers

Title
Effective and sustainable Cs+ remediation via exchangeable sodium-ion sites in graphene oxide fibers
Authors
오영탁이희현이경은김상욱이재승
Keywords
graphene oxide; regeneration; fiber; ion-exchange; Cesium; remediation
Issue Date
2019-08
Publisher
Journal of materials chemistry. A, Materials for energy and sustainability
Citation
VOL 7, NO 30-17760
Abstract
A monovalent sodium-functionalized graphene oxide fiber (Na– GO) structure was synthesized via facile and simple liquid coagulation of a graphene oxide solution. Supported by the stable GO framework, the readily accessible sodium site of this alkali-metal– carbon heterostructure allows effective removal of Cs+ in aqueous medium with a rapid equilibrium time (∼30 min) and a large adsorption capacity (220 mg g− 1). Na– GO possesses physical and chemical integrity in a broad pH range (4– 10), and the adsorption behavior is influenced by the hydration radius of the targeting cation, charge effect, π– M+ interaction, and pH-dependent GO hydrophilicity. In utilizing the chemical potential effect of Na– GO, a simple regeneration process with NaOH solution selectively releases captured Cs+ and replenishes functional sodium sites within the Na– GO structure, providing a rechargeable Cs+ remediation functionality. This study demonstrates the successful adaptation of the alkali-metal-induced reversible ion-exchange principle for a versatile GO fiber structure.
URI
http://pubs.kist.re.kr/handle/201004/70116
ISSN
2050-7488
Appears in Collections:
KIST Publication > Article
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