Modification of Graphene Oxide Membranes by the Incorporation of Nafion Macromolecules and Conductive Scaffolds
Por:
Concha-Guzman, Maria O., Jaramillo-Quintero, Oscar A., Rincon, Marina E.
Publicada:
1 abr 2019
Resumen:
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.
Filiaciones:
Univ Nacl Autonoma Mexico, Inst Energias Renovables, Av Xochicalco S-N, Temixco 62580, Mexico
Univ Nacl Autonoma Mexico, Catedrat CONACYT Inst Energias Renovables, Av Xochicalco S-N, Temixco 62580, Mexico
Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Av. Xochicalco S/N, Col. Centro, Temixco, 62580, Mexico
Catedrático CONACYT-Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Av. Xochicalco S/N, Col. Centro, Temixco, 62580, Mexico
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