Reduced graphene oxide decorated with magnetite nanoparticles enhance biomethane enrichment
| Autor: | José Luis Rodríguez-López, Itzel Covarrubias-García, Sonia Arriaga, Aitor Aizpuru, Guillermo Quijano, José Luis Sánchez-García |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Nanocomposite Hydrogen Graphene Health Toxicology and Mutagenesis Oxide Nanoparticle chemistry.chemical_element Oxides Pollution law.invention Nanocomposites chemistry.chemical_compound Crystallinity chemistry Chemical engineering law Environmental Chemistry Graphite Fourier transform infrared spectroscopy Magnetite Nanoparticles Waste Management and Disposal Magnetite |
| Zdroj: | Journal of hazardous materials. 397 |
| ISSN: | 1873-3336 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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