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Updated: Dec 21, 2025
Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
Published on: September 22, 2015
Reduced graphene oxide decorated with magnetite nanoparticles enhance biomethane enrichment
Itzel Covarrubias-García1, Guillermo Quijano2, Aitor Aizpuru3
1División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica, Camino Presa San José 2055, Lomas 4a Sección, CP 78216, San Luis Potosí, Mexico; División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica, Camino Presa San José 2055, Lomas 4a Sección, CP 78216, San Luis Potosí, Mexico.
Abstract:
The addition of magnetite nanoparticles (MNPs), reduced graphene oxide (rGO), and reduced graphene oxide decorated with magnetite nanoparticles (rGO-MNPs) was evaluated during biomethane enrichment process. rGO-MNPs presented the highest beneficial impact on the hydrogenotrophic assays with an improvement of 47 % in CH4 production. The improvement was linked to the increase of the electron shuttling capacity (ESC) by rGO-MNPs addition, which boosted the hydrogenotrophic activity of microorganisms, to the rGO and rGO-MNPs, which served as reservoirs of hydrogen, improving H2 transport from the gas to the liquid phase, and to the iron ions released, which acted as a dietary supply for microorganisms. Raman and XRD confirmed a greater disorder and lower crystallinity of rGO-MNPs after the hydrogenotrophic assays, with a lower effect at a nanoparticle concentration of 50 mg/L. Moreover, FTIR analysis indicated that rGO-MNPs were oxidized during the hydrogenotrophic tests. This study highlights the advantages of adding rGO-MNPs as a magnetic nanocomposite. Furthermore, rGO-MNPs can be easily recovered, minimizing their release to the environment.
