Lee, Heehyeon Lee, Kyungeun Kim, Sang Ouk Lee, Jae-Seung Oh, Youngtak 2024-01-19T19:31:38Z 2024-01-19T19:31:38Z 2021-09-02 2019-08-14 2050-7488 https://pubs.kist.re.kr/handle/201004/119683 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 (similar to 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, pi-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. English ROYAL SOC CHEMISTRY CESIUM IONS RADIOACTIVE CESIUM WASTE-WATER SELECTIVE REMOVAL AQUEOUS-SOLUTIONS HIGHLY EFFICIENT METAL-IONS ADSORPTION ADSORBENT COMPOSITE Effective and sustainable Cs+ remediation via exchangeable sodium-ion sites in graphene oxide fibers Article 10.1039/c9ta04027g 1 JOURNAL OF MATERIALS CHEMISTRY A, v.7, no.30, pp.17754 - 17760 JOURNAL OF MATERIALS CHEMISTRY A 7 30 17754 17760 scie scopus 000477988200004 2-s2.0-85070093564 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article CESIUM IONS RADIOACTIVE CESIUM WASTE-WATER SELECTIVE REMOVAL AQUEOUS-SOLUTIONS HIGHLY EFFICIENT METAL-IONS ADSORPTION ADSORBENT COMPOSITE graphene oxide regeneration fiber ion-exchange Cesium remediation