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Reduced graphene oxide decorated with magnetite nanoparticles enhance biomethane enrichment. | LitMetric

Reduced graphene oxide decorated with magnetite nanoparticles enhance biomethane enrichment.

J Hazard Mater

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. Electronic address:

Published: October 2020

AI Article Synopsis

Article 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 CH 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 H⁠ 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.

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Source
http://dx.doi.org/10.1016/j.jhazmat.2020.122760DOI Listing

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