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Nanomaterials 2019, 9(4), 556; https://doi.org/10.3390/nano9040556

Modification of Graphene Oxide Membranes by the Incorporation of Nafion Macromolecules and Conductive Scaffolds

1
Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Av. Xochicalco S/N, Col. Centro, Temixco 62580, Mexico
2
Catedrático CONACYT-Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Av. Xochicalco S/N, Col. Centro, Temixco 62580, Mexico
*
Authors to whom correspondence should be addressed.
Received: 14 March 2019 / Revised: 31 March 2019 / Accepted: 2 April 2019 / Published: 5 April 2019
(This article belongs to the Special Issue Surface Modifications of Carbon Nanomaterials)
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Abstract

Stable, reproducible and low-cost graphene oxide (GO)/Nafion (N) membranes were fabricated using electronically conductive carbon paper (CP) matts as a scaffold. The presence of polar groups in the Nafion molecule facilitates the strong interaction with functional groups in the GO, which increases GO dispersion and aids the retention of the composite into the CP scaffold. Distribution of GO/N was carefully characterized by X-ray diffraction work function measurements, Raman and scanning electron microscopy analyses. The performance of these membranes was tested with 1 M NaCl at standard conditions, finding 85% ion removal in the best membranes by a mixed ion rejection/retention mechanism. The Nafion provided mechanical stability and fixed negative charge to the membranes, and its micellar organization, segregation and confinement favored ion rejection in Nafion-rich areas. The good electronic conductivity of these membranes was also demonstrated, allowing for the application of a small potential bias to enhance membrane performance in future studies. View Full-Text
Keywords: graphene oxide; membranes; Nafion graphene oxide; membranes; Nafion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Concha-Guzmán, M.O.; Jaramillo-Quintero, O.A.; Rincón, M.E. Modification of Graphene Oxide Membranes by the Incorporation of Nafion Macromolecules and Conductive Scaffolds. Nanomaterials 2019, 9, 556.

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