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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1287| Photocatalytic Hydrogen Production under Visible Light over Magnesium Ferrite | |
| VANESSA GUADALUPE GUZMAN VELDERRAIN MERCEDES YUDITH ORTEGA LOPEZ ALEJANDRO LOPEZ ORTIZ VIRGINIA HIDOLINA COLLINS MARTINEZ | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Hydrogen production | |
| Magnesium ferrite (MgFe2O4) was synthesized by the hydrothermal technique and was found to be an active photocatalyst for hydrogen production from water under visible light. The structural, morphological, and optical properties of the material were characterized by powder XRD, SEM, TEM, and UV-Vis diffuse reflectance spectroscopy. Iron and magnesium aqueous nitrate solutions were used as precursors under hydrothermal conditions of 200 °C for 3.5 h. MgFe2O4 photocatalytic activity towards the H2 production was determined by gas chromatography, using a batch-type quartz photoreactor and irradiated using a 250 W mercury lamp. XRD results from the synthesized sample found the MgFe2O4 crystalline structure. The optical properties revealed semiconducting properties with a band gap energy (Eg) of 2.07 eV (599nm) showing an efficient visible light absorption. SEM images found particles with a morphology in the form of agglomerates composed of hemispherical particles, while TEM images revealed particles with an average of 9.3 nm in size. Furthermore, the solid exhibited a high photoactivity toward the reduction of water, which is attributed to the efficient separation and transportation of the photogenerated charge carriers. This ferrite material exhibited a production of 650 μmol H2/gcatalyst over an irradiation period of 8 h, thus exceeding the H2 generation obtained by TiO2, which was of 15 μmol H2/gcatalyst. This increase in H2 production is attributed to the fact that MgFe2O4 exhibits a band gap, which is activated under the visible light range. | |
| 2014 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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