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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1282| Synthesis Method Effect of CoFe2O4 on its Photocatalytic Properties for H2 Production from Water and Visible Light | |
| MERCEDES YUDITH ORTEGA LOPEZ VANESSA GUADALUPE GUZMAN VELDERRAIN ALEJANDRO LOPEZ ORTIZ VIRGINIA HIDALINA COLLINS MARTINEZ | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| cobalt ferrite | |
| More efficient materials, which work under the visible light spectrum (energy bandgap from 1.5 to 3.0 eV) are the trends for today’s new photocatalysts in the field of hydrogen production. Within this criteria, some transition metal ferrites are ideal. Since, the development of a ferrite-based photocatalytic material will help to address the need for a stable photocatalysts, activated under visible light and with high application potential due to their low cost. In particular, this paper reports cobalt ferrite (CoFe2O4) as a photocatalyst for hydrogen production, activated under visible light. A comparison between two methods of synthesis; chemical co-precipitation (CP) and milling ball (BM) is presented based on its photocatalytic properties. Furthermore, the influence of the synthesis method over the observed activity is presented. Characterization of CoFe2O4 was performed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area, UV-Vis spectroscopy and water adsorption/desorption tests. Evaluation of the photocatalytic activity under visible light was followed by gas chromatography. Results indicate that crystalline materials with nanometer sizes were obtained (dp < 25nm). BET areas of 21 and 4 m2/g and band gap energies of 1.3 eV and 1 eV were found for CoFe2O4 synthesized by CP and BM techniques, respectively. Water adsorption tests shown an adsorption capacity of 39 for and 30 mg-adsorbed-H2O/g-catalyst for the CP and BM samples, respectively. The substantial decrease in surface area and adsorption capacity of the ferrite obtained by BM is attributed to a possible sintering process that the material undergoes during its synthesis. Photocatalytic activity results showed better activity for CoFe2O4 obtained through the BM synthesis. These results are associated with the creation of vacancies in the BM sample that generated a higher water absorption capacity and consequently a greater photocatalytic production of hydrogen. | |
| 2014 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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