Effective and sustainable Cs+ remediation via exchangeable sodium-ion sites in graphene oxide fibers. Issue 30 (16th July 2019)

• Record Type: Journal Article
• Authors: Lee, Heehyeon; Lee, Kyungeun; Kim, Sang Ouk; Lee, Jae-Seung; Oh, Youngtak
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 30(2019)
• Page Start: 17754
• Page End: 17760
• Publication Date: 2019-07-16
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9ta04027g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A monovalent sodium embedded graphene oxide fiber structure is reported for fast-acting and consistently reusable Cs + remediation functionality. 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.